Cycle information : Cranks with 6 chainring bolts

Use these bolt spacings to identify your crank's pcd and smallest chainring.
For other 4 bolt cranks: pcd = 2 × bolt spacing.

6 bolt chart

Note

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 6-bolt cranks may be estimated as follows:

minimum Oval  =       minimum round      
                 1 - ( 0.0025 × ovality )

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Chris Bell, HIGHPATH ENGINEERING
Cornant, Cribyn, Lampeter, Ceredigion, SA48 7QW, Wales, UK