On 03/08/2017 04:21 PM, Brewster Fong wrote:
On Wednesday, March 8, 2017 at 12:41:59 PM UTC-8, Steve Palincsar wrote:
With Shimano road 11 they've taken road cassettes to 32T, but for
many with the usual (and often not replaceable with any better
gearing) 34/50 that's not a low enough low gear. It was much
simpler in 10 speed days: replace cassette and rear derailleur as
noted above and you're good up to 36T in back. That won't work
with 11, and it's necessary to enter the world of altering cable pull.
Agree. With 11 speed, all of the different platforms work with each
other. So you can mix Campy, Shimano and Sram wheels and cassettes.
With my friends, several have gone to bigger gearing like 11-32 or
11-36 and one friend just picked up an 11-40 or 12-40, so don't know
if that will work. I know there's also 12-42 and I think either an
11-50 or 12-50 11 speed cassette! The key is you need to have a
"mid-cage" RD. All of these big gear cassette is being driven by the
latest "1 by" movement. But that doesn't stop you found adapting to a
bike with a double or even a triple crank! Of course, you may need a
"mid-cage" RD and the wolf tooth thing.
It's not quite that simple if you need low gears. The "generic road
bike" these days is carbon, and there's a good chance it has a non-round
seat tube because swoopy sells. So instead of clamp on front
derailleurs we have braze-on style mounting tabs. And in many cases
those mounting tabs are made so that the smallest big chain ring you can
use is a 50T, because the slot is oriented so that you can raise the
front derailleur (to accommodate a 53) but you can't lower it. That
means you're pretty much stuck with a 34/50 compact double.
And if your 34x32 won't cut it, yes you can go to a cassette with a
monster big sprocket, but your road derailleur (no matter what brand)
won't work. You could eke out an extra couple of teeth with a RoadLink
-- basically a "drop bolt for rear derailleurs" that would let your 32T
capable road rear derailleur fit a 34T, but a RoadLink isn't going to
get you to 40 never mind bigger with a 34/50 crank.
*Compatibility:*
* 10s Cassette Compatibility:
o 11-32: /Not Required (GS medium cage rear derailleur works)///
o 11-34: Single or Double Chainring
o 11-36: Single or Double Chainring (front rings can be no more
than 14 teeth different e.g. 48-34)
o 11-40: Single or Double Chainring (front rings can be no more
than 10 teeth different e.g. 46-36)
o 11-42: Not Supported
* 11s Cassette Compatibility:
o 11-32: /Not Required (GS medium cage rear derailleur works)/
o 11-36: Single or Double Chainring (front rings can be no more
than 14 teeth different e.g. 48-34)
o 11-40: Single or Double Chainring (front rings can be no more
than 10 teeth different e.g. 46-36)
o 11-42: Not Supported
o 10-42: Not Supported
Sure, if you could fit a 36/46 you'd be fine, but you were in this fix
in the first place because of the slot in that mounting tab, so no joy
to be found there. Which means you're looking at MTB rear derailleurs
and cable pull altering devices.
For my next bike, I'm planning on going etap "wireless" with mid-cage
RD. I want to run 11-32 in the rear with a sub-compact double like a
46x30 or 46x28. Since I don't "tour" or carry a load, a 30x32 or
28x32 should be more than enough to get me up the hills around here!
Of course, YMMV! Good Luck!
You can help that luck by making sure your frame has a round seat tube
and uses a clamp on front derailleur. Which pretty much means a
titanium frame.
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