I'd say just use the Kyosho wheels, best quality around and no more expensive than any other really.
When I first came over to the big K in 07 I looked at doing something similar and came to the conclusion it wasn't worth it for the follwoing reasons ...
1) bearings in the hub as per RB5 is a definite improvement over in the wheel when it comes to slop and fast wheel changes.
2) you would loose the ability to change the front axle width by doing it
3) you would have non standard parts which would always break when you had no oppertunity to make some more
4) the effect of running B4 steering knuckles would be really significant (in a bad way) on the RB5s handling
5) to fit B4 axles into the RB5 hubs it would be material on (ie make inserts) which would then give location / security issues over time.
How many front wheels do you need for a 2wd anyway (set of yellows, set of greens, set of BB spikes, set of minipins if you run on carpet and 1 spare set for fresh tires should the day demand it)????
As for should you come to the big red K, hell yeah! I can honestly say I haven't been as impressed with a 2wd car as I am the RB5 since I started racing back in the mid 80s. The 4wd (FS/FS2) is even better than that!!
If you miss the mid motored 2wd then there is about to be another option for the RB5 in a few weeks and Fab's MCS is proving quite popular too.
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