Quote:
Originally Posted by beastmaster2k
Indeed, the specs in the original post are the standard for the 550i GT:
245/45/19
275/40/19
I would be going one step up, just as you did. Are you happy with the result? And do you have an explanation as to why the speedometer corrected itself while it should have become more incorrect, if anything?
|
Good questions. Regarding my satisfaction with the up-size, I was quite happy with the result. It smoothed out the ride a touch (a nice thing when you are running run-flat tires) and it provided a bit of safety on rough winter roads. It did cause some minor clearance issues however, when I lowered the car (on ACS springs) so that I ended up replacing the winter tire/wheel combo with a stock-sized set.
Regarding the speedometer, it did not correct itself. Rather, it was already reading higher than reality. I have read on this forum that BMW speedometers read, on average, 5% higher than reality. With the three BMWs I've owned, I can state that my experience matches this observation. So, when I over-sized my tires (which worked out to about a 4% increase in overall diameter and circumference) the speedometer became more accurate. Go figure!
__________________
2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)