Originally fitted with a 155SR12 radial tyre. The fire-breathing GT on Rostyle wheels had a 155SR13 or the option of a 165/70HR13 tyre.
A big improvement over the HA, with new underpinings and uprated engines under new coke-bottle styling. The one year only Brabham was an early attempt at a hot version, and quite rare now. The GT of 1968 was much more serious, with a big engine, better suspension and significant styling tweaks.