21 inch tire sizes

Common sizes that fit a 21-inch wheel, sorted by overall diameter, from 27.8″ to 30.7″ tall.

7 sizes for 21″ wheels

Size	Diameter	Width	Sidewall	Wheel
245/35R21	27.8″	9.6″	3.4″	21″
275/35R21	28.6″	10.8″	3.8″	21″
285/35R21	28.9″	11.2″	3.9″	21″
255/40R21	29.0″	10.0″	4.0″	21″
295/35R21	29.1″	11.6″	4.1″	21″
265/40R21	29.3″	10.4″	4.2″	21″
275/45R21	30.7″	10.8″	4.9″	21″