TOPIC:

Waiting for these to arrive. Anyone know what they are? Says pin fitment on rear and bearing front, so I'm hoping they'll fit my TRX-3.

Well, they've arrived.

You can see that the pin drive is pretty chewed up, but it looks like if I cut out the pin drive, it will take a hex drive (although I have not measured it). Axle dia is 4mm (or maybe 1/8th inch ) so they (sort of) fit my Cobra (axle is too long by about 5mm). With hexes I think they'd fit quite nicely on the rear.
The front wheels also fit the Cobra (8mm o/d, 4mm i/d bearings), but the axle is again too long by about 7mm. Some sort of spacer would do the job.