aight man, here is a run down of size, roling radius, and width for all those tyres!
185/50/14 = 185mm wide, 92.5mm high (50% of 185) makin the whole roling radius = 350mm (14x2.5x10 height of wheel in mm) + 185 (92.5x2 to give total height of tyre wall) = 535mm (total wheel an tyre diameter) / 2 = 267.5mm rolling radius.
185/60/14 = 185mm wide, 111mm high (60% of 185) makin the rolling radius = 350mm + 222mm = 572mm / 2 = 286mm rolling radius
195/45/14 = 195mm wide 87.75mm high (45% of 195) makin the rolling radius = 350mm + 175.5 = 525.5 / 2 = 262.7mm rolling radius
195/40/14 = 195mm wide 78mm high (40% of 195) makin the rolling radius = 350 + 156 = 506 / 2 = 253mm rolling radius.
therefore 195/40 tyres give the most width for better grip, and a lower profile tyre givin less chance of scrubbing/catchin plus the option of more lower and a better lookin wheel (everyone likes low profile tyres)
and they arent much more expensive than the others, maybe 2-3 quid more per tyre!
hope that helps and isnt too confussing!
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