Choice about shaft sizes was also difficult and complicated furthermore by two different sizes on the big end of the rod. Cost wise each size requested was no different than a completely different bearing. To have bearings from standard to 030 under and for two different O.D.s would require an order for 400 bearings and $20,000.00 investment in bearings that would never be sold in 10 lifetimes,, or more. So, we ordered inserts speced for the large bore rod and in .030 under. We can machine the big end of the small rods to suit and we can get cranks ground much cheaper than stocking $20,000 worth of bearings. Remember the market is limited