Another Spare Tyre Question

Submitted: Wednesday, Jan 06, 2016 at 10:44
ThreadID: 131285 Views:3736 Replies:5 FollowUps:14
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Hi All,

Calling on the collective knowledge of this great group...

My 2014 BT50 came with 265/65-17 Dunlop AT22 Grandtreks and a factory towbar.

I intend to run out those tyres on easy trips, but for outback treks I will probably get 70 profile BFG All Terrains. My first spare, carried in the canopy, will also be one of those.

The issue is the second spare, which is the current OEM spare - a 65 profile Grandtrek. It is under the vehicle immediately forward of the towbar. There is insufficient room between the towbar and the diff housing to accommodate a 70 profile tyre, so I cannot upgrade it without going to the expense of getting a replacement towbar - an expense I'd prefer to avoid if possible.

My question is

If I had to use the Grandtrek second spare, it would have a different rolling diameter to the 70 profile BFGs. Bearing in mind the mechanical fruit in the BT50/Ranger - stability control, traction control, etc - and given that the need to use the second spare might occur some hundreds of km from a repair shop, what are the implications of the different rolling diameters over that considerable distance?

There is no LSD on the BT, just open diffs and traction control, etc and a locker on the rear which I presume I should not use. Unlikely to need it out there anyway.

Would appreciate your comments and advice.

Cheers
FrankP

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