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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes 20x9 ET25 w/ 255/35 PSS ?
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      11-04-2015, 03:29 PM   #23
remmib
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Quote:
Originally Posted by BimmerV8 View Post
been following them for years and I wouldn't choose any other aftermarket wheels. Those guys are damn good. Personally, I do like more the simple look so I would always go for monoblock forged wheels. And they are lighter than the 3-piece wheels. And I like spokes.
My absolute Nr 1 wheels in terms of design are the Alpina Classic wheels made by BBS. The only problem I would have are the stock offsets where I would be forced to use spacers.

back to the HRE FF15 wheels. The weight is incredible. I have calculated the weight difference between my current OEM 19" + Dunlop RFT setup and the FF15 20" + PSS. I come up to an overall saving of ~20kg (19.9kg) or 44lbs if I take the FF15.
I do not have the exact formula for rotating and unsprung mass but I guess the handling will be much better.
I think my bimmer will be grateful.
Here my OEM 351M weight vs my HRE wheel weight. And keep in mind the HRE are 20x9 and 20x11, while the OEM are 19x8.5 and 19x9.

I don't know how accurate the scala was though.

OEM 351M (kg/lbs)
28.7/63.3 + 28.9/63.7 + 29.9/65.9 + 30.2/66.6 = 117.7kg/259.5lbs

HRE (kg/lbs)
22/48.5 + 21.9/48.3 + 24.5/54 + 24.5/54 = 92.9kg/204.8lbs

So the much bigger HRE wheels are 24.8kg/54.7lbs lighter.
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      11-04-2015, 03:57 PM   #24
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thats crazy remmib! how bigger forged wheels are lighter than smaller OEM wheels
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      11-04-2015, 04:21 PM   #25
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this is really impressive.
yes, I have exactly the same OEM M wheels. My calcs are based on official BMW data and the weights of the also very heavy Dunlop Sport Maxx GT RFT I got from Dunlop directly.

remmib, yours are forged monoblock wheels and they should be slightly lighter than the FF15. Is the handling and driving in general clearly improved? do you feel the difference?

I can remember, the total weight of the OEM + Dunlop tires is around 116.xx kg. So your value is feasible. What tires (brand) do you drive on the OEM ?
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      11-04-2015, 10:08 PM   #26
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Quote:
Originally Posted by remmib
I've got 20x9 ET26 with 255/35/20, without rubbing, so I'd get the 20x9 ET25 if I were you.
Do you have a pic ? I'm running 265 on my 9 inch front wheel but I want to see the stretch of the 255 super sport tire.
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      11-05-2015, 02:12 AM   #27
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Quote:
Originally Posted by dadysev View Post
Quote:
Originally Posted by remmib View Post
I've got 20x9 ET26 with 255/35/20, without rubbing, so I'd get the 20x9 ET25 if I were you.
Do you have a pic ? I'm running 265 on my 9 inch front wheel but I want to see the stretch of the 255 super sport tire.
A lot of pics in remmib's thread:
f10.5post.com
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      11-05-2015, 01:08 PM   #28
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Quote:
Originally Posted by BimmerV8 View Post
this is really impressive.
yes, I have exactly the same OEM M wheels. My calcs are based on official BMW data and the weights of the also very heavy Dunlop Sport Maxx GT RFT I got from Dunlop directly.

remmib, yours are forged monoblock wheels and they should be slightly lighter than the FF15. Is the handling and driving in general clearly improved? do you feel the difference?

I can remember, the total weight of the OEM + Dunlop tires is around 116.xx kg. So your value is feasible. What tires (brand) do you drive on the OEM ?
It's a long time ago since a drive the car with the 351M and Michelin 'something' RFT, but yes, there was an improvment.
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      11-05-2015, 01:34 PM   #29
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Quote:
Originally Posted by remmib View Post
It's a long time ago since a drive the car with the 351M and Michelin 'something' RFT, but yes, there was an improvment.
Thanks. I got the weight of my 19" 351M wheels overall 116.68kg. If all figures are correct, the 20" HRE FF15 with the PSS should weight 96.82kg.
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