Some[who?] think that smaller tire wheels, all else being equal, tend to have higher rolling resistance than larger wheels. In some laboratory tests, however, such as Greenspeed test results (accessdate = 2007-10-27), smaller wheels appeared to have similar or lower losses than large wheels, but these tests were done rolling the wheels against a small-diameter drum, which would theoretically remove the advantage of large-diameter wheels, thus making the tests irrelevant for resolving this issue. Another counter example to the claim of smaller wheels having higher rolling resistance can be found in the area of ultimate speed soap box derby racing. In this race, the speeds have increased as wheel diameters have decreased by up to 50%. This might suggest that rolling resistance may not be increasing significantly with smaller diameter within a practical range, if any other of the many variables involved have been controlled for. See talk page.
Sina, Naser; Esfahanian, Vahid; Yazdi, Mohammad Reza Hairi; Azadi, Shahram (18 April 2018). "SAE MOBILUS". SAE International Journal of Passenger Cars - Mechanical Systems. 11 (2): 167–176. doi:10.4271/06-11-02-0014. Retrieved 2021-04-19.
Sina, Naser; Hairi Yazdi, Mohammad Reza; Esfahanian, Vahid (2020-03-01). "A novel method to improve vehicle energy efficiency: Minimization of tire power loss". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 234 (4): 1153–1166. doi:10.1177/0954407019861241. ISSN0954-4070. S2CID199099736.
[2] A Relationship between Tyre Pressure and Rolling Resistance Force under Different Vehicle Speed | Apiwat Suyabodha |Department of Automotive Engineering, Rangsit University, Lak-hok, Pathumthani, Thailand | 2017
Sina, Naser; Hairi Yazdi, Mohammad Reza; Esfahanian, Vahid (2020-03-01). "A novel method to improve vehicle energy efficiency: Minimization of tire power loss". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 234 (4): 1153–1166. doi:10.1177/0954407019861241. ISSN0954-4070. S2CID199099736.
Астахов, Figs. 3.8, 3.9, 3.11, pp. 50-55. Hay, Fig. 60-2, p. 72 shows the same phenomena but has higher values for Crr and not reported here since the railroads in 2011 [1].
were claiming about the same value as Астахов
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Sina, Naser; Hairi Yazdi, Mohammad Reza; Esfahanian, Vahid (2020-03-01). "A novel method to improve vehicle energy efficiency: Minimization of tire power loss". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 234 (4): 1153–1166. doi:10.1177/0954407019861241. ISSN0954-4070. S2CID199099736.
