Shimano 22-32-44 Conversion to 26-36-44 - Any Issues?
With a Shimano 9-speed crankset that came as a 22-32-44 triple, are there any issues with the front derailleur or shifting if I replace the inner and middle chainrings to turn this into a 26-36-44 setup? While the spacing between rings will remain the same, I wondered if lesser differential between the new 36T middle and existing 44T outer ring would cause any problems. Thanks.
You MIGHT have to raise the FDER slightly to clear the smaller rings.
I changed my 22-32-44's to a 22-32-36 & 22-32-38.
I had to leave the FDER @ the 44T setting because going lower caused interference with the middle ring. Didn't get far enough to see if it had problems with the smallest. Looks gawdawful, but shifts-
Last edited by Bill Kapaun; 04-06-13 at 08:42 PM.
Should be OK - FDs are usually specified by the *maximum* tooth difference they will support, and the largest chainring.
Ride, Wrench, Swap, Race
I've also encountered the problem with contact with the middle ring, even when the tooth difference was a full (but only) 10t.
The idea of raising the derailer higher than the recommended height (relative to the big ring) is asking for overshift imo, and of course now you'll be shifting over a non-matched set of rings, yet another ding to the overall rubustness of this setup.
Hmm - I must have always been really lucky with this, especially with my 1992 Marin MTB with it's elderly Shimano DX FD - I've had all sorts of ring combos on it, including the 50/38/26 that's on there now which is shifting beautifully.
Ride, Wrench, Swap, Race
Yes, the older, pre-compact front mtn derailers were a whole lot more tolerant, and thus more versatile. Trek even spec'd these for road triples in the late 1980's.
Originally Posted by Continuity
When the chainring standard for the XT gruppo started to include the 12-tooth 32-44t gap, they "deepened" the cage, making the inner cage plate taller. This taller cageplate would contact the tips of the middle ring's teeth on any crank with only a 10t difference between the largest two cogs.
The cage plate wouldn't hit the granny ring's teeth though, despite there often being only a 10t difference between the small and middle rings, because the cage travels in an arc and not in a straight line.
I think the taller cage plates were needed to compensate for the slower chain speed and higher chain tension of the smaller "compact" rings, helping the front derailer to push the chain more solidly and aggressively to a larger ring.
Last edited by Continuity; 04-08-13 at 06:13 AM.
Thanks a lot for everyone's input. I think it sounds like it is at least worth a try to go with the 26-36-44 setup. If I run into clearance issues, the worst that will happen is the need to get a 48T outer ring...