Soldato
- Joined
- 10 Oct 2006
- Posts
- 3,697
It can cause windup in the transfer box if the tyre sizes difference are too big front to rear which then judders on hard acceleration. I can't find it now but there was a post on a forum where BMW told the owner to put star marked tyres on before they would investigate an issue with juddering on acceleration as the car had x-drive. The owner got a set of star marked tyres for the rear in the same size as what was on the car and when swapping them had a picture of them side by side and the difference was massive looked to be almost an inch despite being quoted as the same size and they weren't budget tyres either, the new tyres resolved the issue.
Don't think it causes a great issue if you have the same tyre brand/model all round but especially on the cars with staggered sizes the star rating means they will be within the tolerances the x-drive system can cope with. With PS4Ss it is not a huge deal as I found the star marked models were cheaper than the standard model.
Don't think it causes a great issue if you have the same tyre brand/model all round but especially on the cars with staggered sizes the star rating means they will be within the tolerances the x-drive system can cope with. With PS4Ss it is not a huge deal as I found the star marked models were cheaper than the standard model.
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