different tyre sizes

Submitted: Saturday, May 03, 2014 at 12:10
ThreadID: 107597 Views:2259 Replies:4 FollowUps:0
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I want to lower the tray on my ute and so am looking for a narrower spare tyre to slot in under the tray. I currently run 31*10.5R15 (265/75/R15). I have run a range of different tyre sizes on a 15 or 16 inch rim through a tyre size calculator looking for a tyre size with the closest radius to the 31*10.5R15.

This spare tyre will also be used only running, at most, short distances at lower speeds, most likely without load, around town. When I go bush I ditch the spare under the tray and carry 2 spare 31*10.5R15 on the tray.

I understand the calculated radius is for a new tyre and a tyre that is 50% worn will be approx 5mm less in radius.

My question is: for minimising risk to handling, diffs or transmission what is the maximum difference in tyre radius I should accept?

Cheers
D
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