Can anybody let me know what the minimum rear disc thickness is? I just took off the winter wheels and serviced the brakes while the wheels were off. The left rear disc is 11.8 mm and the right rear disc is 12.00mm. There is a noticeable ridge at the outer edge, but I don't know the limit.

As normal for me, I took the winter wheels off at the weekend and it is forecast to snow on Wednesday!

Before April 2006 and after May 2006: 12mm disc thickness new, and 10mm minimum worn.

HTH