try 100% scale
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Use these bolt spacings to identify your crank's pcd and smallest chainring.
For other 6 bolt cranks: pcd = 2 × bolt spacing.
The minimum size of an Oval depends on its ovality. It is greater for ovalities more than 20% and smaller when less than 20%. Use the formula on Ovals page 4.
| © Chris Bell, 2007 |
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