There's not much you can lighten a stock flywheel by, and the gain is very little to be honest. However, every little gain soon ads up, but don't expect to feel anything.

The advantage with taking even a few grams off a flywheel though is magnified a great deal at the crank. Someone much cleverer than me would have a formula for it all, but having that lump hanging off the end of the crank doesn't do the bearing any favours.
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Andy.
NSR-WORLD.COM

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