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Lower your tyre pressure and stick a towel under the roller.
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Don't think powertap track sprockets come in less than 14t
White Industries do a 13T, but you need one of my lock rings to go with it because the chain will foul the Powertap/Wheelbuilder.com lock ring.
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Luckily they do a 13t. I can lend if you need.
skinny
gbj_tester
umop3pisdn
@laner
Don't think powertap track sprockets come in less than 14t, and don't have 55t chainring lying around!