Which tire size and brand (car will not be driven winter time) would you recommend for a 1991,850 18x10 MK1 Motorsport?
Also show I use same size for front and rear axles?
Thanks
Last edited by theforce; 07-04-2018 at 05:35 PM.
1991 BMW 850i
1984 Porsche 928S
245/40/18 front
275/35/18 or 285/35/18 rear
MK1s
18x10,ET20.
Have 5mm spacers for the front to bring it to ET15.
Any recommended brand ?
Thanks
1991 BMW 850i
1984 Porsche 928S
because you can?
Hey, if you want to put skinny tires on the rears, go for it. Does make rotating tires easier, but it wont look or perform as nice. The outer circumference stays within the required tolerances with the sizes I listed... note the profiles are different 40 vs 35...
'91 Dinan 860 Stage III (new 6L engine)
'91 Dinan 850 TT stage III (brand new engine) 21st Century Tech meets 18th Century Dinan...
'91 850i 6sp (mint) (sold)
'90 Dinan 750iL TT stage III (Guido - The Beast)
'94 850 CSi The Detroit Auto Show car (restored to factory perfect) (sold)
'96 850Ci, The George Carlin car
''73 3.0 csi, '08 535i, '03 X5 4.6is
...and a few other non BMW cars
Will a 10” wide wheel even fit on the front? Especially with the same/rear offset?
Last edited by Dr. T; 07-05-2018 at 12:55 AM.
As an example, narrowing to 9" would bring the ET to the original 20mm minus 1/2 of the change, ie net 7mm.
For aluminum I have used Eric Vaugh, currently hobbling around the top of LA, and I'm currently doing a pair of steel at Weldcraft, Livonia for $225/ea.
I will put 5mm spacers in the front to lower the ET to 15...
1991 BMW 850i
1984 Porsche 928S
10" wide wheel with et15 wont fit in the front. Original e31 mk's are 9,5 et5 front and there are just few mm tolerance to the shock towers. If you are putting 10" wide rim in the front your et has to be at least 0, maybe even et-5.
Square 10" setup will look stupid because front rims will stick out from fenders. It will also propably rub. Wrong choice.
So what Should I do ?
1991 BMW 850i
1984 Porsche 928S
Get the correct wheels for the car. With the E31, there aren’t really that many options, as all the wheels made for it are specific to the car. The E31 MK1’s are 9” wide for the front and 11” wide for the rears. Going 10” in the front will most likely rub, either on the strut or on the fender, depending on the choice of spacer size.
'93 850Ci - Mineralweiß Metallic
2001 740iL - Titansilber
ALPINA B7 -Alpinweiß III
...the price of cool ain't cheap!
E31 specific mk's are,
9,5x18" et5 front. There are about 5mm gap between rim and shock tower.
11x18" et21 rear. There are about 6mm gap between rim and control arm.
This is pretty much perfect fitment to e31. 10" front might clear the shock tower with et0 but will stick out from fender and propably rub in turns.
Last edited by mikae31; 07-11-2018 at 01:47 AM.
Just an FYI, with a 10" wheel and 245 tire, if you are running et5 and have static camber plates (a la Phoenix Motorsports), they should clear beautifully with no rubbing or fender rolling, even with a mild drop. This is what I am currently running.
Last edited by rotomoto712; 07-11-2018 at 04:30 AM.
are you referring to an E31, or your E38? - big difference. The issue comes when you try to turn the wheel, its not just the strut tube...
'93 850Ci - Mineralweiß Metallic
2001 740iL - Titansilber
ALPINA B7 -Alpinweiß III
...the price of cool ain't cheap!
There is maybe 2mm of space. Just enough to slide a piece of cardboard between the two. The original wheel offset was ET20. With a 10mm spacer only the passenger side wheel rubbed (barely) on the strut tower. Additionally, I stepped up to a 15mm spacer and it cleared. I am running static camber plates, roll correction blocks, and spherical bearings in all front control arms. Perhaps this has an effect? Or variances in wheel/tire manufacturer? The wheels I am running are Beyern Munich, with Falken FK453 Tires. This is on my E31 btw, I no longer have an E38. No issues turning the wheel, as I have had several 140mph + passes on the Autobahns and no rubbing marks on the inner fender liner, fender or the wheel itself.
Last edited by rotomoto712; 07-12-2018 at 04:57 AM.
Even though it works for you, this is not recommended. Wheels width is measured from the inner surfaces of the outer and inner edge. Thickness and shape of the inner edge changes from wheel to wheel and this means some wheel may clear the tower and some not.
I would like to know how bad your car is to drive with those tyres? Stretched 35 (?) series tyre, that cant be good.
30 series actually, my summer wheels are 20", not a popular choice I know, but I like them. The ride is a somewhat harsher than with the 18" style 32s I run during the winter months, but not as much as many think. The steering response is however, noticeably sharper with the larger wheels, especially since they are actually a couple pounds lighter (multi-piece construction), than the factory style 32s and provide more tactile feedback. I'm sure the spherical bearing setup plays a large part, and honestly I wouldn't run anything larger than 18s without them.
Edit: my sincerest apologies, but I went back to check my front wheel, and they are actually 9." I was confusing my rear wheels which are actually 10.5." To the OP listen to the experts not me
Last edited by rotomoto712; 07-12-2018 at 01:36 PM.
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