Relatively new to bicycle mechanics, but I've been having fun disassembling/breaking/attempting to reassemble some old bikes.
Now to the point. I have two questions:
First, I decided to overhaul the hubs on a 1993 Cannondale road bike with RX-100 hubs. For all I know, this is the first time they've been serviced. Did some research, found that the most common bearing ball size for front hubs is 3/16. Stopped by a shop before opening hub, asked for 3/16 ball bearings, mechanic said he only had 5/32, but that they use them all the time without problem as a replacement in hubs using 3/16. Disassembled hub - existing balls definitely appear to be at least 3/16 (unscientifically measured against a tape), but to the eye appear much larger than the 5/32s. The shop owner has apparently been in business for many years, and was highly recommended by a friend who has had years of good service there. Thoughts and opinions? Is it advisable to use the smaller size?
Second question. Both cones on the front have almost identical gouges, no bigger than 0.5mm, at one point of the ball bearing pathway (see photo). From what I've read, I should trash them in favor of new cones. Opinions? Also, what could have caused this? The axle appears straight. There was no play in the hub when it was mounted on the fork. Any thoughts, opinions, advice, or flames?
Oh, one more thing. Anyone have a spare set of cones for RX-100 hubs? Top dollar/euro/sterling paid, as long as it's under five of them.