[volkdent]

Originally Posted by evilC

It very much depends on the rest of the spec. There is always a tendance to over tyre any vehicle and very often the choice is little more than based on aesthetics. Some years ago there was a magazine article in the UK comparing the quickness of a 'S' model Ford Fiesta on the 'wide' 185/60x13 and the 'narrow' 155x13. The narrow tyres were significantly quicker on a long twisty section of road - it was a case of too much tyre scrubbing off speed.

The general rules(ish) that I apply is 155 width for standard power, 195 width for 100bhp, 205 for 150bhp and 225 for above that. Of course this is all modified when you are looking at front or rear on a bug and valso the tyre performance. A tyre built for economy will require a wider width that a sticky performance tyre to acheive similar grip levels.

Clive

Excellent reply!

Jason