Thread: difference in tire weight and its effects

Indeed, mea cupla. It looks like the stock B run-flats are 25 front and 26 rear. The PS2s are 22 front and 25 rear. Can someone comment on whether or not they've seen increased responsiveness and better mpg after losing a few pounds in each corner? -A

You can check tire weights at TireRack. I weighed mine at 25 & 27 lbs at 1k miles. Michelin PS2s are 21 & 24 lbs. (light) Extreme performance tires tend to be in the 24-27 lbs range.

I think it's insignificant on a daily driver. When dealing with a track car and looking to squeeze every bit of power while loosing every extra ounce of weight, you might notice a difference. For a car that is not exactly lightweight such as the E9x, saving 15lbs isn't going to matter much.

Any weight not supported by the suspension in called unsprung weight ( Wheels, brakes, tires...) and is multiplied by 4. You save 1LBS = 4LBS. http://en.wikipedia.org/wiki/Unsprung_mass

Quote: Originally Posted by David9962000 Any weight not supported by the suspension in called unsprung weight ( Wheels, brakes, tires...) and is multiplied by 4. You save 1LBS = 4LBS. http://en.wikipedia.org/wiki/Unsprung_mass This is actually not entirely true...in general, every 1 pound of unsprung weight roughly equals 10 lbs of sprung weight. So if you save 5 pounds per corner, that's 20 pounds of unsprung weight which equals around...

Quote: Originally Posted by MassBimmer This is actually not entirely true...in general, every 1 pound of unsprung weight roughly equals 10 lbs of sprung weight. So if you save 5 pounds per corner, that's 20 pounds of unsprung weight which equals around 200 pounds of sprung weight. Lighter weight wheels are one of the best performance upgrades you can do to a N/A car +1 Don't understand why people buy 18"&...