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Cycle information   -  Cranks with 1 chainring bolt


Use these bolt spacings to identify your crank and its smallest chainring.
These cranks have equivalent pcds between 69 and 74mm.

1 bolt chart



The minimum size of an Oval depends on its ovality - it is greater for ovalities more than 20% and smaller when less than 20%. The minimum number of teeth for 1-bolt cranks may be estimated as follows:

minimum Oval  =       minimum round     
                 1 - ( 0.004 × ovality )

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