Quote:
Originally Posted by cmyX6go
Of course I drive the speed limit. I'm just wondering which way the 1% goes 
Hi mD!
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Lol!
Using my handy PowerDog site, the newer tire set of 275 and 315s vs 285 and 325s, shows a difference of:
704 vs 696 revolutions per mile, (275/315s vs 285/325s)...about a 1% diff.
With the 'original size' of 285s/325s vs the proposed new size of 275s/315s,
the original set at 60 mph on a speedo would theoretically show 61 mph at same speed. Not biggie, imo.
And factor in that the BMW speedos are a tad optimistic anyway, and I wouldn't give it any concern.
Keep that new M under a buck and a half and between the fences.
Happy New Year, L
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