Quote:
Steadymate Wheel Chock - 80014
Keeps your motorcycle from tipping over while in your truck or your garage
Can be permanently mounted or left free-standing
Allows drive-on get-off convenience
For front tires with o.d. of 14 in.-26 in.
Includes trailer mounting hardware
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looks to me like your steadymate chock specifies 14-26 inch outer diameters. A Honda Grom 120/70R12 tire uses a 12 inch wheel but has an overall diameter of about 18.5 inches. The 21 inch wheel might actually be the problem - looks like an 80/90-21 would be about 27 inches and some of the motorcross 21" tires are over 28 inches in diameter.