Will these fit?

EVBIMMER · 12-24-2016, 09:55 PM

2008 135i with sport suspension, JB4 and DCI.

Looking at: A set of Style 397's which are 8/18 ET34 and they have a square set of 225/45 RFL Continentals.

Currently running: Staggered 8x18 ET34 - 8.5x18 ET37 Style 189's with 215/35 Front and 255/35 Rear.

According to my math I would gain clearance in the rear but have less traction. In the front I would gain 26mm in height but I could always swap my 215's to the new rims.

Does anyone have any input on this? I'm concerned about losing rubber in the rear and rubbing in the front.

Thanks!

smrtypants44 · 12-25-2016, 01:03 PM

Stock size in the front is 215/40/18. The 225/45's are way too big and will cause your speedo to be off.

Actual Speed:
62.14 mph
100.00 km/h

Speedometer Reading:
59.26 mph
95.38 km/h
Speed Variance:
4.62% too slow.
Diameter Variance:
4.85%

ianc · 12-25-2016, 10:45 PM

Is vehicle speed calculated from front wheel speed then?

ianc

12-24-2016, 09:55 PM	#1
EVBIMMER New Member 13 Rep 27 Posts Drives: 2008 135i Join Date: Nov 2015 Location: Anderson, SC iTrader: (0)	Will these fit? 2008 135i with sport suspension, JB4 and DCI. Looking at: A set of Style 397's which are 8/18 ET34 and they have a square set of 225/45 RFL Continentals. Currently running: Staggered 8x18 ET34 - 8.5x18 ET37 Style 189's with 215/35 Front and 255/35 Rear. According to my math I would gain clearance in the rear but have less traction. In the front I would gain 26mm in height but I could always swap my 215's to the new rims. Does anyone have any input on this? I'm concerned about losing rubber in the rear and rubbing in the front. Thanks! __________________ Ben in SC 08 135i Titanium Silver Metallic JB4 & DCI Last edited by EVBIMMER; 12-24-2016 at 10:16 PM.. Reason: had wrong offset
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12-25-2016, 01:03 PM	#2
smrtypants44 Captain 518 Rep 895 Posts Drives: 2017 440i Join Date: Jul 2015 Location: Tulsa, OK iTrader: (2)	Stock size in the front is 215/40/18. The 225/45's are way too big and will cause your speedo to be off. Actual Speed: 62.14 mph 100.00 km/h Speedometer Reading: 59.26 mph 95.38 km/h Speed Variance: 4.62% too slow. Diameter Variance: 4.85% __________________
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12-25-2016, 10:45 PM	#3
ianc Ex '87 Carrera 246 Rep 1,259 Posts Drives: '10 TiAg 6MT 135i Join Date: Feb 2010 Location: Redwood Shores, California iTrader: (0)	Is vehicle speed calculated from front wheel speed then? ianc
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