Running Different Tyre Tread On Rears

[silbastian]

what are yours thoughts on running two different types of tread tyres on the rears with a locked diff? i have heard it might be able to break the diff from strain as the two tyres would have different grip temp's... safe or not safe in dry/wet conditions?

[blind_elk]

Under any situation, it makes the car unroadworthy. The tyres on an axle must be identical (maker, model, size).

[djr81]

what are yours thoughts on running two different types of tread tyres on the rears with a locked diff? i have heard it might be able to break the diff from strain as the two tyres would have different grip temp's... safe or not safe in dry/wet conditions?

The strain on a locked diff doesn't come from different tyre grip levels it is caused by the different speeds the tyres need to travel at and can't because you have a locked diff.

A locked diff on a road car is not legal & is a bad idea.

Under any situation, it makes the car unroadworthy. The tyres on an axle must be identical (maker, model, size).

So you are worried about the tyres making it unroadworthy when he is running a locked diff?