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Marchesini makes some forged aluminum wheels for the RC390 which are much lighter. I believe BST and maybe boost also make carbon fiber wheels for it. Which dirt bike are you doing this to? I have a similar project and would like to find out the RC390 wheel specs (e.g. axle diameter, width...

Fantastic Project!!! A real SuperMono! I'm curious about the wheel & tire change. It looks like once you put the fork-lowers on, the front 690 wheel and tire just drop right in. What did you have to do to get the 690 rear wheel + sprocket + disc to replace the stock 390 components?

I'm looking for a more or less complete RC390 rolling chassis with a clean Title for a project. An otherwise-complete bike which has blown its motor would be ideal (I know there are at least a few those out there ;-), but I'm also open to whatever else may be out there. I'm located in Upstate...