I recently purchased new rear winter tires to replace the original TS760, but only in the rear. So I now have Continental TS760 semi-winter tires in the front and Continental ContiVikingContact 6 in the rear - proper nordic studless winter tires.
The CVC6s in the back seemed very slippery on wet (not frozen) asphalt. In one curve on the way to work the traction control always engages with a horrible grunt noise it always makes, even though it never did that at that curve with the TS760s in the rear or the summer tires.
At first I though it was just that the rear tires were new and they don't have the grip on wet that the summer tires or the semi-winter tires do. Then I started thinking that maybe, since they are very different tires, maybe they're not the same size, or don't end up being exactly the same size due to difference in construction and perhaps that confuses the traction control so that even the slightest variance in grip cause it to engage.
So I measured the difference on ground to wheel center on each tire and indeed the front tires where smaller in diameter at the same tire pressure. I figured I could level the difference by changing the pressure in the tires. I now have 3.0 bar (44 PSI) in the front and 2.5 bar (29 PSI) in the back which seems to work - the front and rear tire diameters are now off only by a millimeter or two.
I don't know yet if it really helped, but it'll be interesting to find out and I'll try to remember to post the results, if any.
The CVC6s in the back seemed very slippery on wet (not frozen) asphalt. In one curve on the way to work the traction control always engages with a horrible grunt noise it always makes, even though it never did that at that curve with the TS760s in the rear or the summer tires.
At first I though it was just that the rear tires were new and they don't have the grip on wet that the summer tires or the semi-winter tires do. Then I started thinking that maybe, since they are very different tires, maybe they're not the same size, or don't end up being exactly the same size due to difference in construction and perhaps that confuses the traction control so that even the slightest variance in grip cause it to engage.
So I measured the difference on ground to wheel center on each tire and indeed the front tires where smaller in diameter at the same tire pressure. I figured I could level the difference by changing the pressure in the tires. I now have 3.0 bar (44 PSI) in the front and 2.5 bar (29 PSI) in the back which seems to work - the front and rear tire diameters are now off only by a millimeter or two.
I don't know yet if it really helped, but it'll be interesting to find out and I'll try to remember to post the results, if any.