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stuck cranks, gritty bearings, and an MRP g2 question

Dec 20, 2009
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Ok, I recently got a great deal on a parts set, and had a few questions.

Is there a way to tell the MRP G2 from the MRP G2 Mini? I'm trying to figure out what size ring to order.

When I spin the cranks, they sound gritty. Like there's sand around there somewhere. Would this go away with a good cleaning, or should I order a set of bearings for the bottom bracket? It's a Diabolus crank set.

I also have a Morewood frame, and am trying to get the cranks off. They're standard issue Holzfellers, but I can't for the life of me get the allen bolt to let go. Anyone have any tips for this?

Thanks!