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      04-16-2012, 12:11 AM   #1
wang490
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22 inch rims affect x6m performance or Not

Hi, I just wondering will those 22 inch P40L influnce the x6m's performance?
would that be too big even though it is looking super good !
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      04-16-2012, 12:42 AM   #2
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Ask this member
http://www.xbimmers.com/forums/showthread.php?t=669045

He got HM EVO 22" wheels
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      04-16-2012, 02:32 AM   #3
1230vani
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The car will be slower.
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      04-16-2012, 09:33 AM   #4
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Quote:
Originally Posted by 1230vani View Post
The car will be slower.
That's a bold statement

It may become "slower" if 22s are heavier
And this probably not the case with aftermarket wheels, because they are usually much lighter than stock
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      04-16-2012, 10:11 AM   #5
1230vani
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I assume 22s have a wider track?
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      04-16-2012, 10:39 AM   #6
Biff Grissel
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lol slower? howso? the stock 20" run flats weigh alot more than a 1 piece set of 22"s with non rtf's. so if anything ur truck will be faster. the answer to ur question is no, but ur ride may be slightly more rigid with a bigger wheel.
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      04-16-2012, 03:24 PM   #7
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it is not entirely true that 22" will make the truck slower, depending on the weight, it might be faster if they are lighter than the super heavy oem wheels w/rft
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      04-16-2012, 06:13 PM   #8
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If you compare BMW wheels, it depends on wheels and tires but not a lot.

For example, there is no BMW 22" rim for X6s so I will compare 19" with run flats vs 21" with non run flats.

Style 212 - 19" and Style 128 - 21" look similar.

Style 212 with O.E. Run Flat - Front Wheel
34.392 lbs + 40 lbs = 74.392 lbs

Style 128 with Non Run Flat - Front Wheel
41.447 lbs + 31 lbs = 72.447 lbs

------------------------> 1.945 lbs different

21" with non run flats is lighter but not a lot.
I just compare two BMW wheels and tires and I'm pretty sure there are many aftermarket 22" rims which are not heavy, maybe lighter than 41.447 lbs

Quote:
Originally Posted by Biff Grissel View Post
lol slower? howso? the stock 20" run flats weigh alot more than a 1 piece set of 22"s with non rtf's. so if anything ur truck will be faster. the answer to ur question is no, but ur ride may be slightly more rigid with a bigger wheel.
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      04-19-2012, 05:40 AM   #9
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I'm using ADV.1 10DC it will be much lighter than the stock wheels but its seem hard to find correct tire size 22" should be use 295/30/22 and 335/25/22 it is hardly to find in the market now. so i just use a new size from vredstien to be 265/35/22 and 315/30/22 it is much easier to find.
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      04-22-2012, 06:45 AM   #10
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bigger rims can affect your car in terms of quickness, handling, and if you change your tire outside diameter slightly it can create speedo error.

The FIRST issue is the RIM size and weight. It's not just the weight of a rim; it's how the weight is distributed in radial distance from the center spindle. Larger diameter rims distribute more metal out near the periphery of the wheel, which creates a greater inertial load that requires more energy to get rolling quickly. Given two wheels of similar weight, the smaller diameter one will rotate more easily and thus be the "faster" of the two.
Consider this: Even if a larger rim is a little lighter than a smaller rim, just having the the metal at a farther radius from the hub can make it "slower" to rotate than the smaller but heavier rim.

The SECOND issue is TIRE size. Sidewall height usually decreases as you increase rim size (need to watch out for slight overall diameter changes, as this will lead to speedometer error). Short sidewalls are stiff (RFTs even more so) and help the contact patch track steering inputs more immediately. The down side of short stiff sidewalls is a deterioration in ride smoothness and handling over pavement irregularities esp in corners.
Consider this. If you get rid of your runflats and pack a limited-service spare in the trunk floor, you're lugging around extra sprung weight.

So how does this come together when you're picking a new set of wheels?
Most up-sized rims exist for BLING's sake. Finding the right rim / tire ratio to "look good" is easy - just get the big honking painted rims with rubberband tires. You'll get very responsive steering but if you have stiff short sidewalls, but your ride quality and handling over bumps and cracks will suffer to some degree. Putting 22" rims on your car isn't a good way to make it faster.

If you want a rim / tire combo to "go fast," you want to use a smaller and lighter rim to avoid placing heavy metal way out near the periphery of your wheel. You need to balance the rim/tire ratio to control slop due to side-wall flex, what you can safetly tolerate depends on how hard you drive your car. Run-flats have stiffer sidewalls and are OEM equipment on my X6, but I've never used them on my track cars.
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      04-23-2012, 10:00 AM   #11
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It really depends on what kind of 22" wheels you put on. But even if you put expensive, light wheels, if the rims get wider, you should expect great increase in noise level.
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