The axle diameter on the 1/24 scale cars is 3mm – just like the RevoSlot’s. I don’t know which of our truer’s other than the Hudy will work with a 3mm axle. If you can’t find the 3mm axle for the Hudy you can use your BRM axle as the truer axle.
I would not suggest shore 22 tires. Think of the added weight of these cars and the acceleration these cars have coming out of the turns. We run shore 30’s because we have tried 22’s and 15’s in the past only to discover they shred rubber like crazy. You will be surprised at how much rubber comes off of the 30’s much less the 22’s. Having said that, you are more than welcome to try them out. We will allow 22’s and 15’s for those brave enough to run them.