I have seen conflicting torque specs for the R53 lug nuts, and want to ensure I am torquing to the recommended specs. A quick search showed the following:

• M12: 88 ft/lb
• M14: 103 ft/lb

How do I know which I have? 2006 Cooper S built in 09/06.

 

It should be M14 since the change from M12 was made in July 2006. You could double check by measuring one of your lugs if you're still unsure.

 

go 90 and you'll be fine

I have since 2002

your wrench is probably off by 10 to 20 % anyway

 

+1 I torque my 2003 R53 at 90ft/lbs for street driving and 100ft/lbs for track days, haven't lost a wheel or snapped a wheel bolt yet.

 

Suggestion: After you torque them down, I always go around each wheel twice, take it out on the road for a couple of miles at highway speed then re-torque when you get back. I ALWAYS get a little more turn on some.
PS: 90# also.