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We show the full multiscale Persson's theory for rubber friction due toviscoelastic losses can be approximated extremely closely to simpler models,like that suggested by Persson in 1998 and similarly by Popov in his 2010 book(but we don't make any use of the so-called "Method of DimensionalityReduction"), so it is essentially a single scale model at the so called largewavevector cutoff. The dependence on the entire spectrum of roughness istherefore only confusing, and we confirm this with actual exact calculationsand reference to recent Lorenz et al (2015) data. The multiscale aspect isirrelevant with respect to the real critical issue: the choice of the "freeparameter" best fit truncation cutoff, which shows the models are mainlyfitting equations. In this sense, we provide at least a very simple one.

A simplified version of Persson's multiscale theory for rubber friction due to viscoelastic losses