33 Lego Wheels/Tracks on Wood (worst to best)

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33 Lego wheels, tires or tracks tested on a wooded board to find the best traction. Presented in order from worst to best. Enjoy!

Test method:
adjust the slope angle until the driving car doesn't slide down or climb up but stays in place
measure the angle of inclination
calculate the coefficient of friction = tan(angle)

Potential sources of error:
traction varies along the wooden board (maybe +/- 1 degree of error in spots)
wheel rotation speed varies (faster rotation adds maybe even 2 degrees to the result with some tires, tried to minimize it by using L-motor with large tires)
vibration (happened noticeable only with 15038c03, those errors were omitted)
weight varies (shouldn't matter in theory)
uneven weight distribution on the 4 wheels
angle measurement inaccuracies
== the results are not very accurate, but I'm confident they are roughly correct

All wheels were wiped clean before testing.

The material of the wood board is pine, untreated


Test results:
angle, cof, release year, diameter, part id, link to bricklink.com
13 0.23 1979 -- 3873
14 0.25 2007 -- 57518
18 0.32 1977 41 3649
22 0.40 1977 36 3736
30 0.58 2006 -- x1681
30 0.58 1981 64 4266c02
32 0.62 1975 42 3482c03
33 0.65 1974 24 3482c01
33 0.65 1986 43 2695c01
34 0.67 2013 -- 57518+14149
36 0.73 1983 30 4185c01
38 0.78 2016 -- 57518+24375
40 0.84 2010 14 4265cc01
45 1.00 2014 95 15038c03
46 1.04 2016 105 15038c05
47 1.07 2006 94 44772c02
48 1.11 2001 103 22969c01
48 1.11 2010 94 88517c01
49 1.15 2007 30 55982c03
49 1.15 2009 43 56904c01
49 1.15 2011 67 56908c02
49 1.15 1994 42 6580c01
50 1.19 2006 43 56145c01
50 1.19 2003 43 44292c01
51 1.23 2008 43 56145c04
51 1.23 2006 55 56145c02
51 1.23 1991 83 2903c01
52 1.28 2003 70 44772c01
53 1.33 2011 80 56908c01
53 1.33 1990 49 4266c01
54 1.38 2000 56 6595c01
54 1.38 1998 68 32077c01
54 1.38 1997 63 32020c01

Music:
Heaven and Hell - Jeremy Blake


Blue sky video footage:
NoCopyrightVideoHD