As far as I'm aware, all NC30 front wheels are 3.5" wide, whereas the MC18/21/28 fronts are 3" wide.

The disc offset is the same, as is the axle size.

A 3.5" front really needs to be matched to an HRC rear, and the suspension setup, as the wider front slows the steering down noticeably.
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Andy.
NSR-WORLD.COM

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