Mountain Bike Gearing Chart. Here's a simple way to think about gear-inch combinations: For one revolution of the pedal, your bike will travel a certain number of inches. Dan Milner/MBUK Mountain bike chainsets tend to use even smaller chainrings to deal with steep and off-road terrain.
Shimano's mountain bike groupsets go all the way from the kind of kit you'd find on entry-level off-road and hybrid bikes up to specialist set-ups for extreme downhill racing. What combination is best for hilly courses, technical courses or flat ones? Succeed at this and you'll avoid the wearing out of freewheel cassette cogs, derailleur cages, and even chain rings.
Using a gear-inch chart is one way to compare gear ratios without riding the bike.
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The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. Mountain Bike Size Chart: Colin McSherry. We design high performance mountain bike shorts, jerseys, gloves, and cycling socks for men, women & kids.