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Old 02-22-19, 07:41 AM
  #18  
hokiefyd 
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With your tire size (29x2) and your gearing, you'll have a gear inch range from about 18" to 82". 18" will be the easiest/slowest, and will be quite slow. This will be good for getting up super steep climbs off road. My mountain bike has a 17.95" low gear, and I rarely use it, except when going up something so steep, it's almost worth it to just walk. :-) On the other side 82" for a high gear isn't real high, but you should be fine at more moderate speeds. A 70 RPM cadence with your top gearing will be about 17 mph. 100 RPM will be about 25 mph. So you won't be dropping the peloton with that gearing, but it'll be good for moderate speeds.

If you don't anticipate a lot of rock crawling, and want a faster gear, perhaps consider a 34T or 36T chain ring instead of a 32T.

You can calculate ground speed at certain cadences with different gearing options using this site. You can also certainly adjust certain specs (like your chain ring) to see how going up or down will impact ground speed at certain cadences.
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