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These motors in this thread all have new decals from MCI, except the two ST motors, those are factory

https://www.rc10talk.com/viewtopic.php?t=44606

No and no. None of that is interchangeable. I needed it to as well but came up snake eyes. Wished they kept it all oe myself.

Yokomo axles are unique with the set screw flats and no other way to attach hubs. A common thing is to switch to kyosho axles and a hex conversion. I could be off but I think for 870c, the axles needed are 68 and 73 mm bones. Kyosho really loves their parts and the price reflects that. There are a ...

I also know somebody who will be releasing new versions soon of the zc421 universals for the 870c and the zc422 universals for the works series of cars.

More castor will allow better turn in. Cliff Letts article in RCCA in Dec 1990 shows the blocks used.

slazzaro wrote: ↑Mon Nov 15, 2021 9:00 am Hello! Does anyone know, or can anyone with a Cat XLS re-re take a measurement of these ball studs?
Are the balls 5.8mm diameter?
Thanks in advance! Cheers!

5.5mm