Had a wtf? this morning

Post by Shadow
Went out for my morning ride. Just before a rather steep hill changed
down and I heard a clump and the chain jammed.
I looked back and half of my rear derailleur was sitting on the
asphalt.
OMG, I thought to myself, this is almost as embarrassing as a crank
arm falling off. Then faced the "walk of shame" home.
Note, I scrub chain/jockey wheels/sprockets with water and detergent
every 200 Km. Was almost due for a new clean. Gear change was
absolutely smooth until the incident. HI and LOW screws perfect, no
way the chain came off and "fell into the spokes".
Note I managed to rip a spoke clear out of the wheel with the
breakage. What fell into the spokes was half the derailleur. I suppose
that'll mean a new wheel too
:(
<https://www.sendspace.com/filegroup/v/qdHDWfYEJvo99L3/MhFp6hhZL5Z8ugxHfSuN/uTo4>
The "cleaned" in the filename is because I cleaned the EXIF metadata,
not the parts after the incident....
So "wtf" happened, what did I do wrong and how can I prevent it from
happening again?
TIA

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?

My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mech’s as to if it will last any longer?

The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!

Mind talking of Andrew I expressed surprise that front mech’s could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didn’t really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.

Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.

Roger Merriman

Shadow

2025-02-23 11:12:30 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mechs as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mechs could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didnt really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

Thanks for the reply. The gear had around 8000 Km on it, and I
replaced the jockey wheels last year the cogs were looking like spikes
they were so worn.
I have no idea what caused the breakage. There was a lot of
debris on the road, but I was only doing around 15Km/h, possible but
not likely I managed to pick up a twig and it flew into the spokes.
It felt like it just decided to break..... I would have
expected it to show some signs of failure beforehand.
The bike has 8 gears at the back. The derailleur that broke
was a RD-TX35, designed for 7 gears. Maybe that forced it.
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).

PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

AMuzi

2025-02-23 15:28:41 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mech’s as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mech’s could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didn’t really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

Thanks for the reply. The gear had around 8000 Km on it, and I
replaced the jockey wheels last year the cogs were looking like spikes
they were so worn.
I have no idea what caused the breakage. There was a lot of
debris on the road, but I was only doing around 15Km/h, possible but
not likely I managed to pick up a twig and it flew into the spokes.
It felt like it just decided to break..... I would have
expected it to show some signs of failure beforehand.
The bike has 8 gears at the back. The derailleur that broke
was a RD-TX35, designed for 7 gears. Maybe that forced it.
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).
PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

Those Shimano prices are comparable to US rates:

https://www.amazon.com/Shimano-Tourney-TY300-Derailleur-Standard/dp/B01K5C6F1U?tag=bngsmtphsnus-20&linkCode=df0&hvadid=80264466539886&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583863993594891&psc=1

not much over currently lowest price sources here.

https://cambriabike.com/products/shimano-tourney-ty300-6-7-spd-mtb-rear-derailleur?variant=41153396179126&utm_source=bing&utm_medium=cpc&utm_campaign=PLA&scid=scbplpGM061319-31&sc_intid=GM061319-31

Given that it was well used, could well have been just
overall wear. You set the low gear limit back when it was
less worn, but now all the pins and pivots are sloppy. Only
takes a couple of millimeters more travel to go from normal
clearance to engaged on a spoke.

--
Andrew Muzi
***@yellowjersey.org
Open every day since 1 April, 1971

Catrike Ryder

2025-02-23 15:42:10 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mechs as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mechs could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didnt really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

Thanks for the reply. The gear had around 8000 Km on it, and I
replaced the jockey wheels last year the cogs were looking like spikes
they were so worn.
I have no idea what caused the breakage. There was a lot of
debris on the road, but I was only doing around 15Km/h, possible but
not likely I managed to pick up a twig and it flew into the spokes.
It felt like it just decided to break..... I would have
expected it to show some signs of failure beforehand.
The bike has 8 gears at the back. The derailleur that broke
was a RD-TX35, designed for 7 gears. Maybe that forced it.
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).
PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

https://www.amazon.com/Shimano-Tourney-TY300-Derailleur-Standard/dp/B01K5C6F1U?tag=bngsmtphsnus-20&linkCode=df0&hvadid=80264466539886&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583863993594891&psc=1
not much over currently lowest price sources here.
https://cambriabike.com/products/shimano-tourney-ty300-6-7-spd-mtb-rear-derailleur?variant=41153396179126&utm_source=bing&utm_medium=cpc&utm_campaign=PLA&scid=scbplpGM061319-31&sc_intid=GM061319-31
Given that it was well used, could well have been just
overall wear. You set the low gear limit back when it was
less worn, but now all the pins and pivots are sloppy. Only
takes a couple of millimeters more travel to go from normal
clearance to engaged on a spoke.

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

--
C'est bon
Soloman

Shadow

2025-02-23 17:17:28 UTC

On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Post by AMuzi
Given that it was well used, could well have been just
overall wear. You set the low gear limit back when it was
less worn, but now all the pins and pivots are sloppy. Only
takes a couple of millimeters more travel to go from normal
clearance to engaged on a spoke.

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

AMuzi

2025-02-23 17:30:43 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

Any other well worn bicycles nearby?
Hold the bottom pulley in your fingers and move it
laterally. Note there's play at the pivot between cage and
body and also all four body pivots besides the top spring
pivot. That will be minimal on new units but excessive on
well used derailleurs.

--
Andrew Muzi
***@yellowjersey.org
Open every day since 1 April, 1971

Shadow

2025-02-23 17:56:30 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

My son's Monark has a Shimano RD. That's quite stiff to move
as you described. It's at least 20 years old and has been sitting in a
corner for ages so it might be just dust and rust. Dates are complete
guesses ...
My right arm is not working. I had a compete rupture of my
supraspinal tendon when I fell last year. I went to an orthopedic
surgeon, but he said "I wasn't worth operating on" because of my age.
"It'll be at least 30 months of physiotherapy and you might not last
that long".
The joys of aging.
I'll ask my maid to carry the bike onto my stand so I can
check it tomorrow. Can't lift it myself.
My only other bike is the 1976 Caloi, and that does not have
variable gears.
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

AMuzi

2025-02-23 18:13:28 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

Ouch.
Having suffered similar (but not that) best wishes on healing.

--
Andrew Muzi
***@yellowjersey.org
Open every day since 1 April, 1971

Shadow

2025-02-23 19:29:18 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

Ouch.
Having suffered similar (but not that) best wishes on healing.

LOL. It doesn't heal. Only gets more painful with time.
The only way to heal is to operate within 6 months of the
accident. Before muscle is replaced by a friable fatty tissue. And I
missed the deadline.
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

Catrike Ryder

2025-02-23 18:46:00 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

I didn't see any wear on it other than the jokey sprockets.

That was the first 13 years worth on the Catrike. Now I'm at 40,000.

I suspect that 40,000 miles is not that unusual for the RBT crowd.
Hardcare riders, they seem to be.

--
C'est bon
Soloman

Roger Merriman

2025-02-23 21:27:13 UTC

Post by Shadow
On Sun, 23 Feb 2025 10:42:10 -0500, Catrike Ryder

Thanks for that expert opinion. Makes me feel good about having
changed out my old derailleur at just under 35,800 miles.

Thar's 57000 kilometers. Don't think many people have ridden
that far in their lives....
Mine had quite definite signs of wear, though nothing was
loose.
[]'s

I’m not particularly high mileage as well MTB rides tend to be 15/20 miles
as and when, and Gravel rides 40/50ish is normal with maybe some 70/80/90
ish rides once it’s dry and Gravel not mud!

So since 2011 I’ve done 40k something but some of my fellow commuters ride
15/20 miles in, to central London do that 5 days a week for few years plus
a some club runs and the yearly mileage gets close to 10k per year.

Roger Merriman

Roger Merriman

2025-02-23 16:17:21 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mech’s as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mech’s could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didn’t really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

Thanks for the reply. The gear had around 8000 Km on it, and I
replaced the jockey wheels last year the cogs were looking like spikes
they were so worn.
I have no idea what caused the breakage. There was a lot of
debris on the road, but I was only doing around 15Km/h, possible but
not likely I managed to pick up a twig and it flew into the spokes.
It felt like it just decided to break..... I would have
expected it to show some signs of failure beforehand.
The bike has 8 gears at the back. The derailleur that broke
was a RD-TX35, designed for 7 gears. Maybe that forced it.
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).
PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

Similar to Uk prices, though if wages are 1/10th then the relative cost
will be rather higher.

Useful to know though I’ve had sloppy rear mech’s before now but I’d assume
was checked when bike shop was looking at it, certainly never had a rear
mech into the wheel, but around the cassette more, ie the mech only was
trashed, and in both cases was shifting under load in a bog which was
definitely user error!

Roger Merriman

Shadow

2025-02-23 17:07:04 UTC

Post by Shadow
The bike has 8 gears at the back. The derailleur that broke
was a RD-TX35, designed for 7 gears. Maybe that forced it.
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).
PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

https://www.amazon.com/Shimano-Tourney-TY300-Derailleur-Standard/dp/B01K5C6F1U

LOL .$14.96
$38.70 Shipping & Import Fees Deposit to Brazil.
Delivery Thursday, March 20

But yes, prices are comparable.

The Shimano Tourney TY300 Rear Derailleur is available in
"standard" and "long" cages(RD-TY300 and RD-TY300-SGS). How do I
figure out which one would be a good replacement? I'd guess
"standard", because there is nothing saying "long" on mine.

Post by AMuzi
not much over currently lowest price sources here.
https://cambriabike.com/products/shimano-tourney-ty300-6-7-spd-mtb-rear-derailleur?variant=41153396179126
Given that it was well used, could well have been just
overall wear. You set the low gear limit back when it was
less worn, but now all the pins and pivots are sloppy. Only
takes a couple of millimeters more travel to go from normal
clearance to engaged on a spoke.

I gave it a thorough clean when I replaced the jockey wheels
last year. So I had to re-set the LOW and HI screws. It was pretty
much perfect. Also I was not changing down to the lowest gear when it
broke, it was to the last-but-one. It shouldn't have been anywhere
near the spokes.
So it was probably wear or something my front wheel picked up
and flew back.
I'm more annoyed about the wheel. The spoke ripped a hole when
it came out. A small hole. I don't suppose there is a fix for that?
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

AMuzi

2025-02-23 17:27:24 UTC

https://www.amazon.com/Shimano-Tourney-TY300-Derailleur-Standard/dp/B01K5C6F1U

LOL .$14.96
$38.70 Shipping & Import Fees Deposit to Brazil.
Delivery Thursday, March 20
But yes, prices are comparable.
The Shimano Tourney TY300 Rear Derailleur is available in
"standard" and "long" cages(RD-TY300 and RD-TY300-SGS). How do I
figure out which one would be a good replacement? I'd guess
"standard", because there is nothing saying "long" on mine.

Depending on your own standards, yes it's possible to just
add a washer under the head of the nipple.

In the shop, it's a new rim or a new wheel.

--
Andrew Muzi
***@yellowjersey.org
Open every day since 1 April, 1971

Frank Krygowski

2025-02-23 18:30:37 UTC

I'm more annoyed about the wheel. The spoke ripped a hole when
it came out. A small hole. I don't suppose there is a fix for that?
[]'s

Depending on your own standards, yes it's possible to just add a washer
under the head of the nipple.

I've done that with success. No subsequent problems.

--
- Frank Krygowski

Shadow

2025-02-25 23:11:52 UTC

On Sun, 23 Feb 2025 13:30:37 -0500, Frank Krygowski

Post by Frank Krygowski

I'm more annoyed about the wheel. The spoke ripped a hole when
it came out. A small hole. I don't suppose there is a fix for that?
[]'s

Depending on your own standards, yes it's possible to just add a washer
under the head of the nipple.

I've done that with success. No subsequent problems.

I might try it. It's almost impossible to get the same wheel I
have. It's out of fashion or whatever...
[]'s

--
Don't be evil - Google 2004
We have a new policy - Google 2012
Google Fuchsia - 2021

Roger Merriman

2025-02-23 15:40:07 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mechs as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mechs could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didnt really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

As long as the shifters have same pull, derailleurs are speed agnostic to
the best of my knowledge, see chain rings as well for most part at least.

On the whole even what are budget group-sets should soak up lots of miles,
I had Tourney on the CX bike I owned few years back, was essentially a
proto Gravel bike as a number of CX bikes at the time, ie never intended to
be raced but to hack around the woods and what not!

Had 3/7 Tourney
<https://bike.shimano.com/products/components/pdp.P-RD-A070.html>

Looks to be more budget than yours and much less teeth capacity, it’s
gearing range and gaps were somewhat annoying. But it certainly worked
fine, I didn’t like the Tourney shifters much with the thumb shifters.

Post by Shadow
I can get a Shimano Tourney TY300 cheap, around US$ 15, or an
Altus RD-M310L for around US$ 35. (since salaries, pensions etc in
Brasil are roughly 1/10 of British, multiply by 10 to get an idea of
relative prices).

The Altus as far as I can see, no clutch etc would considering the price
difference particularly including the multiplication would appear to offer
little value over the Tourney.

More modern Altus rear mech’s do have some more features or as and when
Cues reaches you and the cost is appropriate sure yes potentially worth the
upgrade.

Post by Shadow
PS I have no idea if it's short, long, over under etc. I have
the only Shimano gear in town. Nothing to compare it to. People here
use "Sunrun" and "Yamada" which sell for around US$ 4.
[]'s

How cross compatible are they? None of the above mech’s are particularly
sophisticated though should be durable enough, ie they don’t have some of
the MTB technology such as Clutch and so on, they are “just” a rear mech.

Kinda depends if “Sunrun/Yamada” are made from cheese and disintegrated
upon use?

Roger Merriman

AMuzi

2025-02-23 16:14:57 UTC

Did the derailleur come apart due to impact with wheel/cassette or a
failure and then do so?
My old commute bike, had a rear mech fail where the cage and parallel meet
apparently was glued in place? Was an Alivio so broadly similar to the
Tourney I think from memory, Cues which I replaced it with is substantially
more heavily built like the MTB mechs as to if it will last any longer?
The Alivio lasted 9 years and 19,000 miles so probably got my moneys worth!
Mind talking of Andrew I expressed surprise that front mechs could wear
though! My Gravel bike front mech (Sora) had to be replaced due to that!
Only just shy of 12,000 and 7ish years old so definitely sub par, though
have replaced like with like and didnt really seem any reason to match the
rest of the bike ie GRX mostly with Tiagra shifters.
Okay (at least in uk) neither of Tourney/Alivio/Sora/Cues are particularly
expensive being £30ish for a derailleur.
Roger Merriman

As long as the shifters have same pull, derailleurs are speed agnostic to
the best of my knowledge, see chain rings as well for most part at least.
On the whole even what are budget group-sets should soak up lots of miles,
I had Tourney on the CX bike I owned few years back, was essentially a
proto Gravel bike as a number of CX bikes at the time, ie never intended to
be raced but to hack around the woods and what not!
Had 3/7 Tourney
<https://bike.shimano.com/products/components/pdp.P-RD-A070.html>
Looks to be more budget than yours and much less teeth capacity, it’s
gearing range and gaps were somewhat annoying. But it certainly worked
fine, I didn’t like the Tourney shifters much with the thumb shifters.

The Altus as far as I can see, no clutch etc would considering the price
difference particularly including the multiplication would appear to offer
little value over the Tourney.
More modern Altus rear mech’s do have some more features or as and when
Cues reaches you and the cost is appropriate sure yes potentially worth the
upgrade.

How cross compatible are they? None of the above mech’s are particularly
sophisticated though should be durable enough, ie they don’t have some of
the MTB technology such as Clutch and so on, they are “just” a rear mech.
Kinda depends if “Sunrun/Yamada” are made from cheese and disintegrated
upon use?
Roger Merriman

Shimano has used the 'Tourney' model name for many products
since around 1974. The current version TY300 is only wide
range ("SGS") and has three different mounting options.

https://bike.shimano.com/products/components/pdp.P-RD-TY300-SGS.html

Shimano says "6 or 7 speed compatible" but they will shift
both older four or five systems as well as 8 speed rears.
Not enough lateral travel for more sprockets.

--
Andrew Muzi
***@yellowjersey.org
Open every day since 1 April, 1971

AMuzi

2025-02-23 14:59:57 UTC