I also tried it on a SRAM 10-speed road bike and got 28mm of cable movement with nine shifts, or 3.1mm/shift. I just checked on my SRAM 11 hydro disc bike and got 20mm of cable movement for seven clicks of the shifter, which is 2.9mm of cable pull per shift. You can measure the cable pull - how much cable your shifter pulls with a number of clicks, and divide by the number of clicks. Solving the above equation with these cog pitch numbers and the 1.3 shift activation ratio, you can see that the cable pull of SRAM Exact Actuation 10-speed road and mountain shifters is approximately 3.1mm, while it is around 2.9mm for SRAM Exact Actuation 11-speed road shifters. The cog pitch of SRAM (and Shimano) 10-speed cassettes is about 4mm, and the cog pitches of SRAM, Shimano, and Campagnolo 11-speed cassettes are all about 3.8mm. The shift activation ratio multiplied by the cable pull is equal to the cog pitch. Cog pitch can easily be measured it is the the thickness of one cog and its adjacent spacer. If it were not, then the cog pitch (the distance between the central planes of adjacent cogs) would have to be the same on 11-speed and 10-speed cassettes, and it is not. However, and contrary to your contention, the cable pull is most definitely different on 11-speed and 10-speed SRAM road shifters. The shift activation ratio is the same on 11-speed and 10-speed SRAM road derailleurs: approximately 1.3, so you’re fine there. Rather, the spacing between 11-speed cogs is narrower than between 10-speed ones, and since you’d be using the same derailleur with either setup, the shifter determines what cassette it will be compatible with. The shifts will not line up across the entire range, because an 11-speed cassette is not just a 10-speed cassette with an extra cog stuck on at the same spacing. My motivation in keeping the back end the same is that I have multiple wheelsets that have no easy upgrade path to 11s, but I’d like very much to switch over to hydro disc (and there is no 10s SRAM hydro option) - and then slowly start rebuilding my rear wheels.
I assume this will hold, since I understand the cable pull remained the same in going from 10s to 11s shifters. I think I have read all (or most) of the Tech FAQs related to SRAM 11s/10s compatibility, but wanted to confirm an assumption since my goals are different from most.Ĭan I change my SRAM front shifters (currently Force 10s) to Rival/Force 22 hydro (disc) and leave my rear cassette and derailleur (and chain) as 10s? Presumably, tightening down the lower limit screw to keep the shifter from seeking out an extra (low-end?) cog. Get access to everything we publish when you
0 kommentar(er)
