How Wide can I go?

[ocho]

Hi all

I've got a '95 993 Cab running on 19" Turbo Split rims. It looks fantastic, but I think the wheels could do with wider tyres as the wheels actually come out beyond the rubber.

Potential problem is it's already on 275/30s at the back and 235/35 at the front and I'm concerned that if I go any wider I may have problems with the extra rubber catching somewhere.

Anyone know how I can find out what the limits are?

[GreenV8S]

ocho said:

Hi all I've got a '95 993 Cab running on 19" Turbo Split rims. It looks fantastic, but I think the wheels could do with wider tyres as the wheels actually come out beyond the rubber. Potential problem is it's already on 275/30s at the back and 235/35 at the front and I'm concerned that if I go any wider I may have problems with the extra rubber catching somewhere. Anyone know how I can find out what the limits are?

No idea for that specific car. The general rule of thumb is that the rim should be the same width as the tread, give or take half an inch. If in doubt it is better to put narrower tyres compared to the rim width rather than wider, because of the way the tyre distorts under extreme side load. For road tyres the nominal width is measured at the widest point of the sidewall which is typically about an inch wider than the tread (although I don't know if this is still true when you get down to 30 profile rubber band tyres like yours) so e.g. 275 tyres would suggest a tread width of 250mm which is 10". The ideal rim width would then be in the region 9.5" - 10.5". How wide are the rims? Putting wider tyres on the same rims could make quite a significant difference to the comfort and handling because it changes the angle of the sidewalls. Presumably you would need check clearance around the existing tyre to see whether there is space for a wider tyre.

>> Edited by GreenV8S on Monday 25th October 23:06