I just inherited a Max IV! It was my grandfathers since new, but I don't know what year it is or really anything about it. I have a number of questions, but the first has to do with the bearings. What inner axle bearings should I get for it? I think the part number is uc206-17, but this bearing is different from all the others. All the other look to have a locking collar, where as the front ones do not. Should I get the locking collar ones? Finally why is the axle turned down to 1 1/16 at the end? That seems to make the bearings more expensive. Thanks guys!