QUOTE (StuBeeDoo @ 1 Jul 2012, 08:08)
<{POST_SNAPBACK}>I don't think they are, but I haven't actually measured them yet. They
look lower profile.
I've now measured them......
RS200 = 19.8 o.d 8.5 wide
6R4 = 18.7 o.d 9.0 wide
...........And to get back to the original question, I believe that Wayne at W.A.S.P can do 6R4 tyres in urethane
HTH
As an aside;- I've realised that the reason the RS200 is a lot more tail-happy is that due to the longer wheelbase all the weight is (roughly) 10mm further from the guide.