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-   -   Shimano 105 rd compatible with larger than 32t cassette? (https://www.bikeforums.net/general-cycling-discussion/1159602-shimano-105-rd-compatible-larger-than-32t-cassette.html)

biketampa 11-05-18 03:06 PM

Shimano 105 rd compatible with larger than 32t cassette?
 
Is shimano 105 rd compatible with larger than a 32t cassette without something like roadlink? I know shimano's site states 32t max but are people having success with 11-34 cassette? my crankset is 50-34. current cassette is 11-32. Is going to 34t much different. Or should I bite the bullet and go for 40t using roadlink?

fietsbob 11-05-18 03:17 PM

Why our source your decisions?
 
Reduce the difference on the front between chainrings and all the wrap
is difference in the back..

with a 50-34 you have 16t...
need a longer RD Cage to wrap up the difference?.
Get one . there is a 105 version for triples..
53-30 is a road triple wrap up ... 23t






...

Elvo 11-05-18 03:52 PM

It depends on your derailer hanger geometry but I would say it is highly likely it will work with 11-36 possible with b screw all the way in.

daoswald 11-05-18 04:00 PM

I have an older long-cage Shimano 105 10sp derailleur that is designed for rear cassettes up to 27t. I currently have a 28t rear cog installed. My drive train is 3x10. At first the 30/28 combination caused the derailleur's jockey wheel to touch the rear cassette. Adjusting the B-screw almost all the way in took care of that problem but led to sloppy shifting. Removing a link or two from my chain (after verifying it wouldn't cause 50/28 to explode) allowed me to back off the B-screw a bit, and shifting improved.

YMMV. If you're exceeding the design spec you pretty much have to ask someone who has done the same, or experiment.

Gconan 11-05-18 06:02 PM

I have a 50◊34 chainrings by 11◊34 cassette.

mstateglfr 11-05-18 06:07 PM


Originally Posted by biketampa (Post 20649586)
Is shimano 105 rd compatible with larger than a 32t cassette without something like roadlink? I know shimano's site states 32t max but are people having success with 11-34 cassette? my crankset is 50-34. current cassette is 11-32. Is going to 34t much different. Or should I bite the bullet and go for 40t using roadlink?

on a 5800 GS rear deraieur, a 34t cog works without much or any adjusting. A 36t cog works with adjusting the b screw for a lot of bikes and a roadlink may be needed for other bikes(my gravel bike needed one).
not sure why it works for some but not all bikes, perhaps its a mix of chainstay and derailleur mount placement.

wipekitty 11-05-18 09:23 PM

I've run 11-32 with a 5800 SS (short cage); depending on your setup, there's a good shot that a 5800 GS (medium cage) will work with up to 36. It's only spec'd for up to 32, but the SS is only supposed to take a maximum 28. Apparently, Shimano's specs are known to be conservative.

Those of you whom have run 36 max with 5800 GS or similar, what cassette do you use? I've been told that there's an SRAM cassette that will work (though I cannot remember what it is).

mstateglfr 11-05-18 09:52 PM


Originally Posted by wipekitty (Post 20650108)
Those of you whom have run 36 max with 5800 GS or similar, what cassette do you use? I've been told that there's an SRAM cassette that will work (though I cannot remember what it is).

sram pg1170 is what i have

jeffpoulin 11-05-18 09:55 PM

I've run 11-34 on a 5701 medium cage with a 105 triple chainset (30-39-50). I even tried 11-36, but had slight chain rubbing.

The new R7000 11sp derailleurs are rated up to 34t, so should do 36t without an issue (on a double chainset).

McBTC 11-05-18 10:39 PM


Originally Posted by Gconan (Post 20649865)
I have a 50◊34 chainrings by 11◊34 cassette.

ditto-- 11-speed... swapping out the OEM 11/32 cassette for the Shimano's new 11/34 for 105 didn't even require more chain.

Witterings 11-06-18 02:57 AM

I asked a mechanic the other day the exact same question as I'd seen a couple of videos of people doing it and he thought you could go to 34t fairly easily as Shimano's nimbers were relatively conservative and "could" go to 36t but he felt that would eventually lead to breakages as it'd put it under quite a bit of pressure.

Flip side I was looking at the Specialized Seq Elite .... whether it's because of the specific aftermarket sunrace cassette but it's 36t .... the bike in my opinion for my uses offered the perfect gearing

https://www.specialized.com/gb/en/se...elite/p/129126

biketampa 11-06-18 05:39 AM


Originally Posted by Witterings (Post 20650317)
I asked a mechanic the other day the exact same question as I'd seen a couple of videos of people doing it and he thought you could go to 34t fairly easily as Shimano's nimbers were relatively conservative and "could" go to 36t but he felt that would eventually lead to breakages as it'd put it under quite a bit of pressure.

Flip side I was looking at the Specialized Seq Elite .... whether it's because of the specific aftermarket sunrace cassette but it's 36t .... the bike in my opinion for my uses offered the perfect gearing

https://www.specialized.com/gb/en/se...elite/p/129126

interesting.

biketampa 11-06-18 05:41 AM


Originally Posted by McBTC (Post 20650187)
ditto-- 11-speed... swapping out the OEM 11/32 cassette for the Shimano's new 11/34 for 105 didn't even require more chain.

good to know. Main reason I want to keep my 50/34 chainring is I have my crankarm power meter so I prefer to keep that.

locomotion1 11-06-18 06:10 AM

nice

biketampa 11-06-18 07:06 AM


Originally Posted by Witterings (Post 20650317)
I asked a mechanic the other day the exact same question as I'd seen a couple of videos of people doing it and he thought you could go to 34t fairly easily as Shimano's nimbers were relatively conservative and "could" go to 36t but he felt that would eventually lead to breakages as it'd put it under quite a bit of pressure.

Flip side I was looking at the Specialized Seq Elite .... whether it's because of the specific aftermarket sunrace cassette but it's 36t .... the bike in my opinion for my uses offered the perfect gearing

https://www.specialized.com/gb/en/se...elite/p/129126

i just read specs for latest Shimano 105 and there are specíd to 34t.

MikeyMK 11-06-18 07:20 AM

I've had derailleurs on a drop link for a couple of years now, no problems (90s XTR, recent Tiagra and XT). Big outer washer on the wheel axle probably helped support the hanger, fitted purely due to them being electric bikes (11-36 freewheel).

biketampa 11-06-18 08:55 AM


Originally Posted by McBTC (Post 20650187)
ditto-- 11-speed... swapping out the OEM 11/32 cassette for the Shimano's new 11/34 for 105 didn't even require more chain.

is the difference between a 11/32 and 11/34 pretty noticeable?

52telecaster 11-06-18 10:19 AM


Originally Posted by biketampa (Post 20650363)


good to know. Main reason I want to keep my 50/34 chainring is I have my crankarm power meter so I prefer to keep that.

I have run a 10 speed long cage 105 with 34 tooth cassette. When I used a 11-36 it required the b screw to be all the way in and sometimes I could still hear and feel the top jockey wheel hitting the cassette. It wasn't a big deal. If you dont mind fussing and spending some money you could go 11-34 on the cassette and get a TA inner ring for your crank of 33. They are the only available 33 tooth chainring in the 110mm bcd. It costs 30-40 bucks or so but 33-34 for your low gear would be almost touring territory.

52telecaster 11-06-18 10:21 AM

http://www.wiggle.com/ta-110-pcd-zephyr-inner-road-chainring/

TimothyH 11-06-18 10:55 AM

I'm running a SRAM 11-36 cassette with a Shimano Ultegra 6870 GS derailleur and Ultegra 50/34 cranks.

No Roadlink is used. The B screw is turned almost all the way in. It shifts perfectly and I crosschain the crud out of it.

https://www.bikeforums.net/19517297-post137.html

Every bike is different and your results may vary. The only way to know for sure is to try it.



-Tim-

McBTC 11-06-18 01:14 PM


Originally Posted by biketampa (Post 20650635)
is the difference between a 11/32 and 11/34 pretty noticeable?

sure... a 2-tooth jump is noticeable... more noticeable, however, and appreciably better is that while both cassettes share the 25t cog in common and starting there, you have 3 lower and more evenly spaced gears above compared to just 2. Better yet -- and, a good trade-off for me -- you have more evenly spaced higher gears and wider by a bit when going to the 3 cogs below the 25, which you get because the new cassette loses the 12t cog.

McBTC 11-06-18 01:39 PM

here's what your getting with the swap...

11-34 gearing (11-13-15-17-19-21-23-25-27-30-34t)

vs.

11-32 gearing (
11-12-13-14-16-18-20-22-25-28-32t)

i.e., evenly spaced gears from 13-to-27 compared to 3t jumps on either side of the 25-cog. If you spend a lot of time spinning 12t with your 50t ring you might be disappointed; otherwise, I'll probably find more uses for a 30t than a 32t and if needed, now you have a 1-to-1 gear in reserve. All of the 19 'comfort/endurance/gravel' models with 105-gearing probably will have this latest arrangement.

u235 11-06-18 01:47 PM


Originally Posted by Witterings (Post 20650317)
I asked a mechanic the other day the exact same question as I'd seen a couple of videos of people doing it and he thought you could go to 34t fairly easily as Shimano's nimbers were relatively conservative and "could" go to 36t but he felt that would eventually lead to breakages as it'd put it under quite a bit of pressure.

Put what under a lot of pressure? The angle of the cage arm with the stock chain length while in the big big 50x34? If so, I think that would be minimal if anything just because it is not a combination most people would be going in and out of a lot on purpose. I ride my RD592 in 50x34 or 36 on occasion in a pinch but it's not ideal. Different RD but still...

biketampa 11-06-18 06:57 PM


Originally Posted by McBTC (Post 20651195)
here's what your getting with the swap...

11-34 gearing (11-13-15-17-19-21-23-25-27-30-34t)

vs.

11-32 gearing (
11-12-13-14-16-18-20-22-25-28-32t)

i.e., evenly spaced gears from 13-to-27 compared to 3t jumps on either side of the 25-cog. If you spend a lot of time spinning 12t with your 50t ring you might be disappointed; otherwise, I'll probably find more uses for a 30t than a 32t and if needed, now you have a 1-to-1 gear in reserve. All of the 19 'comfort/endurance/gravel' models with 105-gearing probably will have this latest arrangement.

excellent thanks.

biketampa 11-06-18 06:58 PM


Originally Posted by TimothyH (Post 20650887)
I'm running a SRAM 11-36 cassette with a Shimano Ultegra 6870 GS derailleur and Ultegra 50/34 cranks.

No Roadlink is used. The B screw is turned almost all the way in. It shifts perfectly and I crosschain the crud out of it.

https://www.bikeforums.net/19517297-post137.html

Every bike is different and your results may vary. The only way to know for sure is to try it.



-Tim-

cool. Thanks. Iíll have to decide if I want to go 11-34 or 11-36


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