[mhassler]

I've decided to swap out the 19" 351Ms on my '13 550xi MSport for a staggered set of VMR v710s in Gunmetal size 20x9 ET35 and 20x10 ET35. I'm also going to install H&R Sport Springs (item 50470-2).

Factory setup is square, tire size is 245/40r19 which has a 26.7" diameter.

Considering a 245/35r20 (26.8") and 275/30r20 (26.5") but thats a pretty low profile all-season tire for NE Maryland roads. The front and rear diameters would be off by 0.30" so the difference in revs-per-mile at those diameters is 7 which is less than a 1% difference -- probably not worth worrying about.

Another option is jumping up in profile to 245/40r20 (27.7") and 275/35r20 (27.6"). Gives another 0.5" in profile height and a closer diameter which equates to delta of 4 revs-per-mile also less than a 1% difference. So the more relevant question becomes is a 27.7" tire diameter too large (1" taller than stock) when coupled with a 1.4" drop?

Curious if anyone has either of these tire combinations coupled with the H&R Sport Springs on their F10.

If so, hows the clearance? Any pics? I combed through the dozens of posts on here regarding tire size and springs but as always it's hard to find the exact same setup for reference.

FWIW - I'm aware a 245/35r20 (26.8") and 285/30r20 (26.7") is the ideal x-drive staggered setup with a 255/35r20 (27.0") and 295/30r20 (27.0") a close second but I didn't mention those sizes as there are no Ultra High Performance All Season Tires in that size, only Summer tires.


WHEEL & SPRING INSTALL COST
What have others paid to install springs (whether dinan, ACS, H&R, eibach) and swap TPMS from OEM to aftermarket rims. Had two local shops quote me $1400 and $2200:

SHOP 1
$200 to swap the wheels and reset TPMS
$600 for front springs
$500 for rear springs
$90/hr for alignment

SHOP 2
$270 to swap the wheels
$160 for new valve stems (they said the valve stems are special to the TPMS and can't be reused so I have to buy four new @ $40 each??)
$913 for front springs (6.3-hrs)
$551 for rear springs (3.8-hrs)
$298 for alignment

Seems very expensive to me. Read a bunch of posts and I'm sure I can do the H&R install myself --never lowered a vehicle but have lifted over a dozen Wranglers and Grand Cherokees over the years-- but with three kids under 10 my weekends are very busy and valuable to me, although not sure they are worth $2gs.


Thanks!