We have now a separate part no. for every different size of grinding, so you can order the exact desired size… there’s a small price break for larger oversize cranks…. The welded counterweight crankshaft is still Bob’s favorite as it’s the only crank he never saw break! They’ve been made forever by his friend José in California and do the job as no other! Counterweight cranks let your engine run smoother, give more horsepower, rev faster and give better mileage, because everything runs way more in balance.