On 23 Nov 2020 at 14:40, George Tyler via EV wrote: > I have seen similar reports, but what it did not take into account is the > change in accuracy of the odometer! In now reads 10% higher for the same > distance travelled, and you also travelling it at a 10% lower speed!
Sure, IF you switched to smaller wheels but kept the same profile (height) of tire. But who would do that? You'd fit higher profile tires to the smaller- diameter wheels. Then you'd have the same, or nearly the same, total wheel- and-tire diameter as before. Depending on wheel size, a 2018 Tesla Model S may use 3 different tire sizes. Look at the diameters of each combination: 19" wheels - 245/45R19 tires - total diameter = 27.7" 20" wheels - 245/40ZR20 tires - total diameter = 27.7" 21" wheels - 245/35ZR21 tires - total diameter = 27.8" >From smallest to largest wheels, you're talking about a 0.36% difference in diameter, and thus in odo and speedo calibration. That's negligible. The weight and aero resistance of a vehicle's wheels absolutely DO make a difference in range and energy consumption. Lee's example of his friend's car shows that it can be a pretty substantial one. If you really want to make the most of the energy in your EV's battery, you don't use the ludicrous oversized wheels you find on Teslas and nearly every other expensive EV. You use wheels more like the ones in these photos: https://en.wikipedia.org/wiki/File:GM_Sunraycer.JPG http://evdl.org/images/gm_impact_lsr.jpg http://evdl.org/images/gm_impact.jpg or even https://upload.wikimedia.org/wikipedia/commons/c/c9/HondaInsight.jpg Now THOSE are cars and wheels actually designed for efficiency, not for "macho" looks. The wheels of the last two examples still aren't quite as smooth as they should be, but they're worlds apart from the heavy, brutish wheels that Tesla and the others use today. David Roden, EVDL moderator & general lackey To reach me, don't reply to this message; I won't get it. Use my offlist address here : http://evdl.org/help/index.html#supt = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = I LIKE paying taxes. With them, I buy civilization. -- Oliver Wendell Holmes = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
