Larger wheels and blowers

In reply to banning cars with larger wheels and blowers in class 8.  I use a Liege in classic trials, as do a few other competitors, it has 16 x 3 period wheels and 16 x 5 Avon tyres (tyres designed in 1954 and still in production) cost £39 each. The Liege at 460 kg uses a Reliant engine at 40 bhp on a good day, with the optoinal blower fitted a bit more, should the Liege be banned?  Peter Davis.