Gearbox internal bearings are a pair of 10x14 and a pair of 5x10 bearings. Rear hub bearings are 4 off 5x10. Front wheel bearings are 4 off 4x8.
The spur gear is the tricky one, the official arrangement is two washers either end, with two plain 4x8 bearings with a spacer in the middle. A pair of flanged bearings will remove the washers and spacer, and not have the gear running against a couple of washers.
Built as Kyosho intended there are no flanged bearings in the Ultima, but I would advise fitting a pair of flanged bearings in the spur gear.
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