[Kearton]

Hi Johnny,

a few points:-

1) If the car is grounding on speed bumps, its springs may have stretched /softened with age (without breaking). If so, replacing them should solve this.

2) The ZT / ZTT's ride height is 7mm lower than the 75's.

3) Mk 1 ZT/ZT-Ts had firm suspension. When the Mk 2 came out, its suspension was more compliant. The original was then made an option called "Sports suspension". If yours is a Mk 1, it might be possible to fit Mk 2 springs to improve the ride. Get expert advice on this before trying.

4) Whilst most 75s had higher profile tyres, contributing to a more comfortable ride, their smaller wheels may not clear the ZT-T's discs & callipers (depending on which variant you have).

5) Check beforehand with your insurance company that they are happy for you to make these changes if you intend doing any.

Regards,
Kearton