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      02-24-2008, 11:04 AM   #1
Italteen3
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Stock wheel weight for 135i.

Searched this forum and could not find a thing.

So would anyone happen to know the stock weight of the wheels, and the wheels only, for the 135i? Trying to figure out how much weight I will save with the OZ Ultraleggeras with the wheels coming in at 74lbs for all four wheels. :headbang: With non-runflats I think shaving 50lbs of rotational weight should be attainable and very beneficial.
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      02-25-2008, 06:51 AM   #2
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Check this link:
http://felgenkatalog.auto-treff.com/
Stock 264 style wheels are 11kg (24.2 lbs) front and 11.92 (26.2 lbs)kg rear
OZ Ultraleggeras are 18.6 lbs for 18" x 8" and 20.8 lbs for 18" x 9".
So...100.8 lbs stock and 78.8 lbs for Ultraleggeras = 22 lbs saved (wheels only)
Now you just need the proper offsets for the Ultraleggeras to work.
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      02-25-2008, 08:08 AM   #3
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That's actucally not bad for OEM wheel weights. With the same tire mounted you'd be hard pressed to notice the difference without going to a sub 20 lb. wheel, like the Ultraleggera. For sure I'll mod the suspension before replacing wheels. Much bigger bang for the same buck (ie, BBS RGR or RE). I do like the Ultraleggera's a lot too.
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      02-25-2008, 02:40 PM   #4
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I did some calcs using some info from tirerack and with an 18x8 / 18x9 staggered setup the OZ Ultraleggera will result in the following chages:

front
3mm MORE clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 15mm

rear
6mm MORE clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 18mm

Could someone who has seen the car in the flesh comment if they think this will be ok? I like the idea of some more clearance on the strut side as this opens the door for some more negative camber!
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      02-25-2008, 04:04 PM   #5
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Quote:
Originally Posted by spdrcr View Post
... I like the idea of some more clearance on the strut side as this opens the door for some more negative camber!
Not unless you use less common "crash bolts" that change the wheel/hub relationship with the strut. Most people use adjustable camber plates that move the entire strut and wheel/hub assembly as a unit.

It does increase the clearance available for slightly wider tires up front.
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      02-25-2008, 05:34 PM   #6
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Honestly, you probably wont even notice the difference in weight. I put 18" Ultraleggeras on my GTI (the stock wheels prob weighed around 25lbs) and I didnt notice any increased acceleration or anything like that.
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      02-25-2008, 08:21 PM   #7
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It's handling where u supposed to see the difference first.. Less unsprung weight = lighter on the feet..


Quote:
Originally Posted by gatorfast View Post
Honestly, you probably wont even notice the difference in weight. I put 18" Ultraleggeras on my GTI (the stock wheels prob weighed around 25lbs) and I didnt notice any increased acceleration or anything like that.
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      02-25-2008, 08:48 PM   #8
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The rule of thumb is that unsprung weight (wheels & tires in particular) translates to sprung weight at a ratio of 1:4. Each pound of unsprung weight equals 4 pounds of sprung mass. So while 25 lbs. saved in wheels/tires doesn't sound like a lot, it equals 100 lbs taken off the rest of the car.
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      02-25-2008, 09:06 PM   #9
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Lighter wheels makes a huge difference. I saved 17#/wheel when replacing my stock MINI wheels with some lightweight Kosei wheels and non-runflat tires. You can feel the difference in every aspect of driving...acceleration, deceleration and cornering.
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      02-26-2008, 12:01 AM   #10
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Quote:
Originally Posted by TP 135i View Post
Check this link:
http://felgenkatalog.auto-treff.com/
Stock 264 style wheels are 11kg (24.2 lbs) front and 11.92 (26.2 lbs)kg rear
OZ Ultraleggeras are 18.6 lbs for 18" x 8" and 20.8 lbs for 18" x 9".
So...100.8 lbs stock and 78.8 lbs for Ultraleggeras = 22 lbs saved (wheels only)
Now you just need the proper offsets for the Ultraleggeras to work.
I came up with 17.64lbs for the 18x8 and 19.25lbs for the 18x9 from the weight off the website? So lets say Im right that is roughly 25lbs saved from the wheels alone.

Anyone else think another 25lbs is possible by going to non runflats?

Appreciate the info everyone!
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      02-26-2008, 08:20 AM   #11
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Look up bridgestone's website and find the weight of the runflats vs the tires you are looking to run. Keep in mind, high-performance summer tires tend to be a bit heavier than all season tires due to their stiffer sidewall reinforcement. Nate
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      02-26-2008, 01:31 PM   #12
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^^ I did a little tire comparo today. Seems sheding the RFs will save on average 2 lbs F and 3 lbs R per corner. That's looking only at like sized conventional "summer" performance tires with the proper load rating (very important).
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      12-20-2013, 05:44 PM   #13
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The only offsets shown on Tire Rack's website for Ultraleggeras for our cars is 40mm for both 8x18 and 9x18.
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      12-27-2013, 08:20 AM   #14
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Look at weights for the tires on tire rack. You'll find that the run flats are not necessarily heavier depending on what tire you compare it to. On the other hand there are lighter tires for sure so if weight is your primary consideration you can shave off another 2 or 3 per corner. If you want to keep going for weight you can shave another 4.7 lbs on the front per corner by going with 2 piece rotors from rb brakes.

Other light wheels you can consider are the apex wheels as well as the Forgestars. Forgestars have the advantage of allowing you to order exactly the offset you want down to the mm.

Also keep in mind that weight savings at the tire is theoretically better than weight savings near the hub when the wheel is rotating. Think of a spinning gyroscope and your ease of changing its direction - less weight further out makes it easier to change direction.
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