![]() It does actually work alright as such though, it's not like it's really disadvantaged in any way compared to a similar, standard singlepivot. Doesn't do much to braking characteristics either.īasically it's fairly much equivalent to a singlepivot design with the pivot slightly lower than it is on each of the GT bikes. It does provide some MINOR (and I stress minor) theoretical advantages due to the mass of the front triangle moving relative to the rider, but since we're looking at a ~30:1 ratio of masses (rider vs front triangle) it's not a big deal at all. If you want index finger shifting, you have to go Shimano. You can get twist shifters to work with your SRAM derailleur, though. Second question: Nope, SRAM shifters actualte with the thumb for both shifts. Since pedalling efficiency is determined largely by the same factors (axle path relative to centre of mass), it has little effect on that too. Although, I think the older 1st generation I-Drives were 68mm BB shells (the other possible size on a mtb). In reality it has the same compromises as everything else, because the axle path should be calculated relative to the centre of mass (mainly the rider, which moves backwards with the BB, relative to the front triangle) in order to determine bump absorption characteristics. ![]() What it does is theoretically allow for a relatively high pivot (good bump absorption and firmer pedalling) without having too much pedal feedback (what you feel as the pedals being tugged backwards when the suspension compresses due to the chain being pulled on). So in other words, whereas with normal bikes the BB is fixed relative to the rest of the front triangle, it can move slightly with the suspension on an i-Drive. ![]() What the i-Drive setup does is put the bottom bracket on a link that is attached to the front triangle (check out any close-ups you can find of any of the recent model i-Drives, they work on the same principle as the old ones but it's easier to visualise what's going on), rather than directly mounting it on the front triangle. ![]()
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