Would a 18" wheel with 255/55-18 tyres have the same overall size as a 17" wheel with 235/65/17 tyres.Thanks

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2004 2.8 crd Limited

255/55-18 = 29x10.04-18
235/65-17 = 29x9.25-17

The 18-inchers are wider than the 17-inchers. But I don't think you will have a problem with them rubbing.

Handy tool for measuring tires sizes:
http://www.dakota-truck.net/TIRECALC/tirecalc.html

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

Thanks jeepkj02 ,would a spare wheel in the 18" size be needed if running the 18's or would a spare wheel in the 17"inch be ok, wondering if the slight size difference would cause problems with transmission.

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2004 2.8 crd Limited

For offroad purposes I would get a full size/matching spare. For street purposes, it would work, but I wouldn't recommend driving with it on for a long time or at high speeds, keep it under 88 kph (55 mph).

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

I've got 16"s with Goodyear Atr's for off roading, and some 17"s for the street ,seen some 18"'s at a good price and was considering them also for street use,was wondering if i would need to buy 4 or 5 wheels ,as i've read somewhere that mismatched wheel sizes or even under inflated tyres can cause probs with transmission.

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2004 2.8 crd Limited