Tyre Size Help??????

[nigel129]

Im looking for two new front tyres. All four coners since i got the Surf have 31.10.50.15r but the spare is a 265/70/15.
It seems that the 10.50 are generally more expensive than the 265 and harder to get hold of. Ok, ill put 2 times 265 on the front and leave the back two.
Now im told it can bugger the Diff up "wind up the diff" if i do this. Any help or comments greatly appreciated.
nigel129

[NiftyNev]

265/70/15 = 29.6x10.4/15

265/75/15 = 30.6x10.4/15

31" tyres aren't always true to size and metric are probably the same. Some 31s are actually only about 29.5".

Nev

[Tallyman]

You are only likely to cause diff wind up if you have different sized tyres on the same axle. It will not cause a problem if you have different sizes front to back, even if you are using 4wd off road, as the softer surface should allow the front wheels to "slip" anyway.

[Apache]

I agree (sorry!)

As long as they are approximately similar rolling circumference front axle to back axle, they'll be fine.

[PDR]

What I’d do is buy 4 new 31” tyres and keep one of the existing 31” as a spare.

I bought a set of General Graber AT2 @ £70 each (fitted & balanced) so a set of 4 would only cost you £280