What causes wheel wobble?

[agc]

My wheels wobble and move back and forth when I hold the car off the ground and spin the wheels as fast as i can with my finger. What causes that???

I cannot see the wheels wobble back and forth or car wobble on the track. But could it be wobbling so small amounts I can't see it?

[derbydominator]

AGC,

You can create wobble in the spin just by using your finger. That is why we like to do a dremel spin to test the wheels. A light felt attachment on the dremel and just a touch at the lowest speed will get the wheel spinning. Then you can get a better judgment on the wheel stability. I guess you could do it with a regular hand drill and attachment but haven't tried.

With that little sanding with each grit, I would imagine that you have not diminished the overall diameter very much. Do you have a caliper to compare the thickness of the axles? If you have time and the axles and wheels, I would suggest modifying some more and then pick the best out of the bunch following some spin testing unless you have a track to test on, especially since you seem to be a bit uncomfortable with some of the pairs. You can drill an axle hole in a spare block of wood and insert your axles in the hole partially to do the spin tests. Time the spins and also judge stability and pick your best pairs. You will have a fair amount of play between regular bsa axles and wheels so some instability will be present regardless.

I sent you a pm.

Darryl