- 26 to 29er gear ratios…
It depends a bit on what size tyres you are running, but basically you want the expression
D * (f/r)
to be the same, where:
D=the diameter of the wheel (rim+tyre)
f=number of teeth on the front
r=number of teeth on the rear
You can think of that expression as giving you the diameter of the equivalent sized wheel on a penny farthing for the gear you are in!
Alternatively, just use Sheldon’s neat gear calculator:
Basically 32/36 with a 56mm tyre on a 29er rim is close enough to 34/36 with a 60mm tyre on a 26″ wheel.Posted 4 years agothisisnotaspoonMember
(29-26)/26 = 11%
34-11%= 30(ish), but 30t is hard to come by as it won’t fit on normal 4 bolt cranks. If you want/need it then I’d get a 32 and a 11-36 (or 12-36) cassette. 32t with whatever your existing cassette is will be aproximately half a gear higher.
Don’t know why people don’t refer to gear inches more often in mtb.
a) it leads to arguments over whether it’s measured as development or as a wehel size (it should be wheel size, development is usualy expressed in metric units)Posted 4 years ago
b) it’s fairly nominal as unlike road bikes with 23mm tyres, everyone picks a different tyre.
c) it’s really most relavent on fixed/SS bikes (all my MTB SS’s are 49-50″)wobbliscottMember
I’ve heard/read that 29″ wheel is roughly worth about 3 teeth on the chainring. I’ve not worked this out myself, but seems to pass the common sense test. I’m running 1×10 on my 29er with a 28 up front (so maybe equivalent to a 31 on a 26er) and the usual 11 – 36 cassette out back. It is low enough for me to tackle any steep climb but I do suffer a bit on the high end when i’m on a smooth track/road descent, but in those situations i’m not looking to power my way down. So all in all it gives me more than enough range for off road riding. I could probaly go for a 32T up front, but what’s the point? I’d rather have the extra low gear to go into if I feel I need/want it.Posted 4 years ago
The topic ‘26 to 29er gear ratios…’ is closed to new replies.