Bike tools Beta
Wheel and tire fit
Whether a tire suits your rim, whether a wider one will clear your frame and fork, and what a smaller rear wheel does to the bike.
Rim and tire
Will a wider tire clear?
With the tire you run now, measure the smallest gap you can find between the tire and the frame, and between the tire and the fork: beside it or above it, whichever is tighter. In millimeters.
Six millimeters is the usual minimum to keep a muddy tire from grinding the frame. A taller tire also sits closer to the fork crown and the seat tube at full compression: let the air out and check both before you ride it.
A 27.5 in rear wheel in a 29er
A lower bottom bracket means more pedal strikes. Some frames have a flip chip or a link made for this; ask the frame maker before you swap.
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