RonCT

Posted this in wheel / tire, but thought not many read that forum and it would be interesting to those that read this forum...

https://rennlist.com/forums/showthre...12#post3967312

elh0102

I've read a bit about unsprung weight recently, and there is, for sure, disagreement about how variations affect performance. The ratio of 6:1, or any ratio, is an interesting academic topic, but again, it seems subject to a lot of question. I've never seen the results of any tests that actually verified anything. My seat-of-the-pants experience suggests that reduction in unsprung weight can enhance the way the car feels; i.e., how it transmits road feel to the driver. The manner in which it impacts speed and acceleration, relative to comparable reductions in sprung weight, is much less clear to me. For the casual DE participant, it is not something I would recommend spending big money to pursue.

RonCT

I agree the value of the impact will vary based on the needs / desires of the driver. If you are shopping for a set of DE wheels and tires, it makes sense to see what is out there in lighter weights. For example, one combination of wheel / tire might end up at 55 lbs front and 60 lbs rear, while another set might be 45 / 50. The cost might be $400 more to save the extra 10 lbs per corner, but that might be well worth it in performance benefits.

It's all relative. Some people spend $5,000 to add 25 hp / tq with bolt-ons, yet do not understand the performance benefits of saving unsprung weight.

Edgy01

One big reason I chose the PCCBs,--big weight savings in an important area.