How much does one S-lite weigh without the tire? I know that run-flats are heavy, but will changing rims really make a difference if you don't change the tires? Just curious.

 

Yes they are THAT heavy. No changing the wheel without a performance non-RF will not make a HUGE difference. Though anytime you decrease unsprung weight you help improve performance.

 

So what are we talking here - 25lbs per wheel or more? So with the run flat it's about 40lbs total? Am I in the right ball park?

 

When I went from S-lites and Runflats to SSR Comps and non-runflats, I lost something like 15 lbs. of rotational mass at each corner. The cars' performance after the swap was the way it would perform after a passenger got out of the car. Not to mention the elimination of ride harshness....

 

no,runflats are listed at 22lbs so you're looking closer to 50.i've just posted a thread on the wheels/tires forum about runflat weights that may interest you though.
pip.

 

first thing I did on the car was change to SSR 14# wheels (GT7) and Dunlop non-run-flats. Other than the 15% pulley, the best mod I made. i don't know the exact weight difference, but the performance difference was very noticeable.

 

When I sold mine the shipping weight was 60lbs per wheel and tire.

 

When I removed the S-lites and Goodyear RSA tires, I wondered why they felt so heavy.... No wonder I got improved acceleration and braking from swapping the SSRs and non-runflats....

 

per mini2.com faq, 25lbs per corner.

http://www.mini2.com/forum/faq.php?f...heel_tire_tech

 

Okay okay, so they're 25lbs per corner. Nobody's said what the weight of these other non-RF and wheel combos are! 24lbs?

 

Cool my X-Lites are only 17.6!

 

Rotational mass is much different than static mass. I have a formula for computing a comparison (it's a relationship between weight and location of weight within the radius) but I believe it came out to a 3.5:1 +/- ratio of rotating mass at a 17" diameter versus static weight. So getting rid of the S-lites and runflats is similar to losing a very fat girlfriend!

 

I weighed mine just to see the difference betwen th S-lites and my new Kosei wheels. The S-lites came in at just ounces over 25 pounds each! The Koseis were appeox. 14.5 pounds each - huge difference, one I immediately felt on the 'ol butt dyno. Do yourself a huge favor and change to any one of many lightweight Mini wheels available.

 

Never weighed everything separately, but the combination of 5zigen wheels, which claim a weigh of 15.5 lbs and Pirelli p-zeros was 37 lbs per corner (if memory serves). I lost about 13 lbs per corner, which feels like driving a different car.