Mountain Bike Granny Gear Ratio
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The minimum gear ratio you can use with a rohloff hub is 2 5 1.
Mountain bike granny gear ratio. Therefore on a 26 rohloff bike you can get as low as 15 95 and on a 700c bike you ll get 19 102. In order to run that ring you are going to need a direct mount crankset. If you had to change to 30t chainring on the sram drivetrain you would achieve similar gear ratios as the shimano xt of 30 42 0 714 and 30 10 3 000. Surly ecr 29 rohloff 34txrohloff 14s 18 1 gear inches.
The ecr rohloff combo has the lowest gearing. If you re concerned with optimizing performance and don t want to give up gears on the climbs or descents then 2x10 is likely the better choice for you. Niner rlt 9 steel 700c 35mm 2 11 36x32t 30 6 gear inches. Therefore a 26 8 speed bike will have gears as low as 26 79 and a 700c bike will go as low as 27 84.
Marin pine mountain 2 27 5 1 11 32x42t 22 1 gear inches. A sram 10 42 cassette has a very similar gear range but with a 32t chainring the lowest gear has a ratio of 32 42 0 762 and the highest gear has a ratio of 32 10 3 200. Surly krampus 29 2 10 22x36t 18 6 gear inches. You can see the climbing gear ratios are close between the two systems.
A 26 11 speed bike will have gears as low as 26 105 and a 700c bike will go as low as 27 111. In order to achieve a seamless transition in your climbing gears a 28t ring would get you there. Benefit of 2x10 gearing on long climbs many cyclists want lower granny gears for long climbs particularly when training and racing at altitude.