Rear cogs
You have a choice of using
either the
standard fixed cog,
or a
freewheel. The fixed cogs
are precision CNC machined,
and are available in 13, 14, 15,
16, 17, 18 or 19T size.

The freewheel is only
available in 16, 17 or 18T
size.
gear chart for 700C wheels
Check out the                    
Speed Calculator. What
chain ring and cog combo
is best for you?
Gearing Chart for 700C Wheel
Gearing Chart for 650C Wheel
Chainring and rear cog tooth sizes: This is all about gear ratios.
As with a lot of things, the size of the sprockets is a personal
choice. The standard 46/18 on the 700C wheel (44/16T for the
650C size) provides a generally popular mid-range gear ratio,
allowing a flat road speed of 18.5 MPH at 90 RPM, small enough
to climb all but the toughest hills, and not too small for the
downhill ride, to keep RPMs from getting too high. See gear
charts to the right for possible options.
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