Quick Shimano rear mech question

slowbike

Wife has requested an option of a slightly larger range cassette for the hillier rides.

Currently using 30-12(? it may be 11 - doesn't matter) with Shimano 5700 "standard" rear mech - I think they call it short cage ... it's not as long as my tiagra one on the Tricross with a triple front. She has 34-50 on the front.

She'd like to have a 32-xx - but I know the rear mech won't take it as the top jockey wheel is too high. Actually she didn't say 32-xx at all - just an easier gear - but swapping to a triple would be more expensive ...
Anyway - does a long cage mech have greater space at the top between itself and the cassette? I could just try by swapping out my one - but that means messing up 2 bikes for the sake of one easy question!
tia!

arthur_scrimshaw

I don't think there's any general rule, the capacity of the mech with regard to cassettes is unrelated to cage length. That said some may have a greater capacity. I would check the specific mech's capacity on the makers website, I know with shimano you can in certain circumstances go up a bit. So on my 105 rear mech the capacity according to the big S is 28 but I have run a 30 without issues. The other way is to buy an adapter to increase the capacity like the wolf tooth.

http://fitwerx.com/wolf-tooth-roadlink- ... er-review/

fat daddy

I run a tiagra long cage on my hybrid, its designed to take a 34t with a double and a 32t with a triple .. I have an 11-32 10speed cassett with it and 50/34 up front

slowbike

Arthur Scrimshaw wrote:

I don't think there's any general rule, the capacity of the mech with regard to cassettes is unrelated to cage length. That said some may have a greater capacity. I would check the specific mech's capacity on the makers website, I know with shimano you can in certain circumstances go up a bit. So on my 105 rear mech the capacity according to the big S is 28 but I have run a 30 without issues.

Yup - that's what she's got at the moment - it's tight on the 30 - as in the jockey wheel is practically touching the cassette.

Arthur Scrimshaw wrote:

The other way is to buy an adapter to increase the capacity like the wolf tooth.

http://fitwerx.com/wolf-tooth-roadlink- ... er-review/

Ah yes - forgot about those - that could be a good way to do it for the occaisional use. It would do exactly as needed - in moving the mech down away from the cassette - the overall differential capacity isn't critical if the rider remembers not to go to the extents of the cassette in the wrong ring up front.

shmooster

5701 medium cage allows for 32T, as well as having enough capacity to take a triple, but still happily works with a compact setup. I don't think there's an 11-32 cassette in 105 5700 but you can use any 10 speed Shimano cassette, not just 105.

slowbike

fat daddy wrote:

I run a tiagra long cage on my hybrid, its designed to take a 34t with a double and a 32t with a triple .. I have an 11-32 10speed cassett with it and 50/34 up front

yup - my Tricross is similar - although only 9 speed - but wasn't sure if that was down to where the rear mech attaches to the hanger.

slowbike

shmooster wrote:

5701 medium cage allows for 32T, as well as having enough capacity to take a triple, but still happily works with a compact setup. I don't think there's an 11-32 cassette in 105 5700 but you can use any 10 speed Shimano cassette, not just 105.

ok - ta ... that's handy to know.
not bothered about the 11 cog - I can always do a pick'n'mix with another cassette anyway.

arlowood

Slowbike wrote:

shmooster wrote:

5701 medium cage allows for 32T, as well as having enough capacity to take a triple, but still happily works with a compact setup. I don't think there's an 11-32 cassette in 105 5700 but you can use any 10 speed Shimano cassette, not just 105.

ok - ta ... that's handy to know.
not bothered about the 11 cog - I can always do a pick'n'mix with another cassette anyway.

Your answer is a Shimano SLX HG10 11-32 cassette (or 11-34 if you think you can get away with it using a medium cage RD)

http://www.chainreactioncycles.com/shim ... -prod52312

I fitted one to a flat bar bike I built for my grandson - it worked brilliantly with the Ultegra 10-speed flat bar shifters and a CX50 (46/36) chainset.

slowbike

Ta

Nick Payne

If the shifters are 5700 then any Shimano 9-speed MTB RD will be compatible, and will definitely allow a cassette up to 34t and probably 36t if you want. I'm using that combination myself on one bike - a Deore XT M772 9-speed RD and Ultegra 6700 shifters with an 11-36 10-speed cassette. Shimano kept cable pull identical across road and MTB up to 9-speed MTB and 10-speed road, so a 9-speed MTB RD changes perfectly across a 10-speed cassette with 10-speed Shimano road shifters.

This RD, for example: http://www.chainreactioncycles.com/au/en/shimano-deore-m591-9-speed-rear-mech/rp-prod40543.

slowbike

Ah - excellent - although the 5701 medium cage is cheaper - but won't take quite such a large cassette ... hmmm ...

ta

svetty

Nick Payne wrote:

If the shifters are 5700 then any Shimano 9-speed MTB RD will be compatible, and will definitely allow a cassette up to 34t and probably 36t if you want. I'm using that combination myself on one bike - a Deore XT M772 9-speed RD and Ultegra 6700 shifters with an 11-36 10-speed cassette. Shimano kept cable pull identical across road and MTB up to 9-speed MTB and 10-speed road, so a 9-speed MTB RD changes perfectly across a 10-speed cassette with 10-speed Shimano road shifters.

This RD, for example: http://www.chainreactioncycles.com/au/en/shimano-deore-m591-9-speed-rear-mech/rp-prod40543.

This - I use the XT M771 MTB mech - but either one works perfectly with 10sp road shifters. You will need to add a few links in the chain

fallenagain

If you go down the MTB route, you'll need a long cage one. The medium cage ones can cope with 35 teeth difference. You have a 16 difference in front, so this only allows 19 on the rear.so a 12-32 will be about your maximum. I'm running a long cage XT RD with an 11-36 cassette. the medium cage didn't work.