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The Plus 4 has the lowest profile tyres of the whole range of "standard" trad cars. Fit 195/65 R15 tyres and you raise the ground clearance by 10mm.
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- My Plus 4 Sport has 205/65R15 tyres. No grounding problems, but luckily there aren't a huge number of road humps around here!
It must be fitted with the standard Roadster rims, which is an option, the standard tyre fitment on the Roadster was 205/60 R15. Fitting 195/65 tyres takes the ride height up to about 15mm more than the standard Plus 4.