I used to do quite a bit of on-tarmac racing with 1/10th off rodad cars back in the late 80'8, early 90's.. i remember Racing in Stafford and Telfords on Tarmac with my Hotshot II. I used foam tyres back then, it was great fun!
I have not seen any 1/10th off road tarmac racing since i got back into RC three years ago
Neil