Originally posted by ausracer
were there any rules to stop someone puposely wearing the rally blocks to almost a slick?
Yep! There was a minimum circumference measure. The worst was that the measure is taken after the mains and if anyone of the four wheels were under the minimum diameter, you lose your best main.
This was done because on the last race, a new 'brand' of tyre was seen on the track, was called 'Slick rally block' and for seeing any kind of tyre with minimum block you need to do a hard imagination work.