I think to put it in a nutshell, as far as acceleration is concerned, it's wheel RPM where the benefits of less rotating mass are manifested...
~Holland On Jan 14, 2016 10:24, "Chad Rebuck" <[email protected]> wrote: > I don't know if you would say the impact of the tire weight varies based > on gear. The acceleration benefits with lighter weight wheels/tires are > greater the faster they are accelerating. In the same way, a lower weight > flywheel, pulley,or other rotating piece would provide more benefit when > the engine rpm is changing quickly, so lower gears are where the benefits > would be most noticeable. > > Maybe we are saying the same thing? I spent too much time thinking about > this already :) > > On Thu, Jan 14, 2016 at 12:04 PM, Larry Velez <[email protected]> wrote: > >> Seems like each gear would have different gains on wheel weight reduction >> so it would depend on what your end goal is but generally less unspring >> weight seems to be “better” (and more expensive per size) >> >> >> >> Rotational Inertia - Equivalent Mass >> >> https://www.youtube.com/watch?v=SR3nVx1aaTo >> >> >> >> -Larry >> >> >> >> *From:* [email protected] [mailto:[email protected]] *On >> Behalf Of *Holland Phillips >> *Sent:* Thursday, January 14, 2016 11:43 AM >> *To:* [email protected] >> *Subject:* Re: [mk2-16v] Impact of wheel weight on acceleration >> >> >> >> Back when I was building my '92 GTI 16V, I chose BBS RC 16x7.5 wheels >> because they were the lightest wheels available at the time. I understood >> the physics involved, as in the benefits of lower unsprung weight, less >> rotational weight, etc. All these aspects greatly benefit handling, >> braking, and acceleration. Not to mention I always loved the look of that >> style of wheel. They are reminiscent of the BBS 3 piece wheels that were >> used on the old Porsche RSR race cars from the early seventies, and >> continued to be used by Porsche and BMW for years on their race cars. >> >> ~Holland >> >> On Jan 13, 2016 19:53, "Chad Rebuck" <[email protected]> wrote: >> >> I had never really seen a test like this done. 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