Appreciate the link. I have the RD-M410 (Alivio version?) so the pulleys are prob'ly the same. I 'spose I could count the teeth and know for sure.....but then, that would be too easy
Hadn't thought about the shorter cage benefit, but that makes sense. I'm on 26" tires, so no help for me. "longer lever arm"...sounds like my "not as many rotations per stroke, thus less wear-and-tear" comment. YMMV "fer sure"
Wondering if that's a trend overall, or maybe just for a specific class of bike, or just a passing fad (for whatever biz bennies Shimano gets from it).
Cheers.....
Originally Posted by
GAJett
Rivendell sells the Shimano Altus which has a 13-tooth jockey pulley and a 15-tooth tension pulley. The stated advantages are:
* Greater chain wrap allowing for a shorter cage hence more clearance - important for small-wheeled bikes and maybe some mountain and cyclocross bikes;
* The larger diameters provide a longer lever arm around the pulley Axel's reducing the effort to spin them.
YMMV
Cheers!