Shaving a tyre to match a set

[syncro up]

Has anyone got experience of shaving a new tyre down to match a part worn set.

I am in the situation of having 4 equally worn BFG MT with 11mm of treat and a brand new spare with 14mm.
Is 3 mm of tread difference going to be too much for the VC, particuarly for the 250mile motorway cruise to SP-09.

Has anyone had a new tyre shaved before.
Other option is to get another new tyre, run the two new tyres on the rear with the propshaft out on the road stretch, and swap the four old tyres around on the front untill the new ones match the old. But this means a new (expensive) tyre and having to drop the prop shaft in and out more than id like.

Any suggestions?
Alastair

[syncropaddy]

Having ONE tyre 3mm difference in size to the others will have absolutely no effect on the VC. Its only when you have TWO tyres on the same axle that are of a different size to the others that the problem starts.

[syncro up]

excellent,
thanks for that