Joined: Jul 2015
Posts: 7,344
Likes: 3,207
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
what makes a ring a middle... hmnmmm... the ramps and counterbores for the nuts are on the same side of the ring... an outer ring has the ramps/pins on the inner side, counterbores on the outer side
and even Sugino rings have a ramp of sorts... it's a chamfer (angle) on the inner side of the ring, and goes all the way around the ring... primitive, but it does help shifting!
ramps and pins speed chain pickup by the larger ring, making shifting less troublesome and "crisper"... upgrading to ramped/pinned chainrings will make you realize how effective they are.... smoother, faster, shifts will be noted!
Last edited by maddog34; 11-09-17 at 03:59 PM.