Posted 01 May 2004 - 11:51 PM
If you have standard 5 ½ J rims then the most you should got to is a 185 section tyre. These are generally available at 65% aspect ratio but this is somewhat smaller in diameter than the original tyre & so does not fill the arches so well. A 185 x 70% aspect ratio tyre is almost identical to the original 165 x 75% (??) aspect ration (an original Pirelli tyre on my car measured around 635mm dia.) but this size can be difficult to source &, as they are not amongst today’s “popular” tyre size, are quite expensive! The nearest match I could find, & I think the best compromise, is to fit a 6J rim with a 195 x 65% aspect ratio tyre. But remember, widest is not necessarily best on a road car & a 205 section tyre is excessively (& unsafely) wide for standard 5 1/2 J rims. The suspension was never designed to cope with the forces these tyres inflict + the steering will become very heavy a low speed; Personally, I think tyres of this width look rather silly on a classic TR road car! But if it’s customised & you’ve done all the mods, that’s another story – go for 18 inch wheels with low rubber to match!
1971 TR6 owned since 1975