Quote:
Originally Posted by mattlynch
thanks for the reply, still need the ball diameter as its just the RPM ball cups i want to use on an all metric X-Pro chassis, i could use 4-40 ball studs from the b4 but dont want to buy all new hubs ,uprights, bulkheads ,ackerman plate, servo saver. cheers again
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Because I'm such a nice guy, I just measured one for you.
4.28mm (as near as dammit 4.3mm)
I don't know what size the X-Pro uses - probably either 4.8mm or 4.3mm. If 4.3mm then US-style cups should fit, if 4.8mm then Tamiya or Kyosho cups should fit. I wouldn't be surprised if the Kyosho ones are the ones to go for since the X-Pro is basically a copy of an RB5.