Avon had the GP tyre (this pattern is still available from Avon) in the 50s and 60s and predominated the sport in these eras.
In the 60s Avon stopped producing tyres for m/c racing and Dunlop introduced the Triangular KR73 front tyre and KR76 rear tyre.
Michelin introduced a more rounded profile tyre series, numbers of which I cannot remember, something 32, 45, in compounds PZ2 and PZ4. I started using these in 1975 at the same time that they were introduced in the GPs.
Then Dunlop came out with a similar profile in the KR124 and KR145 which are still available as the KR124A front and KR164 rear with a smaller section KR824.
The slick dry tyres first appeared in the USA, I think both Goodyear and Firestone (for a short while) produced slicks. Kenny Roberts used Goodyears when he came over on the works 500 Yamaha. Both Dunlop and Michelin also produced slicks. Up to the late 70s early 80s all racing tyres, like their road counterparts were of cross ply construction. Radial construction tyres are now the norm, However, I think that even modern classic tyres are still cross ply.
Yamaha TZs of the 60 and 70s were delivered from the factory with Yokahama (Jokeahama) racing tyres which were nothing better than probably a tyre from the 50s (if that).
Have a look at this site.
It lists Dunlop racing tyres fro the 20s
Edited by tonyed, 17 November 2013 - 07:27.