[Sharps40]

I think I got the formula now.....6.7x15 oughta be .....

215mm/25.4= 8.464" wide x 0.75 = 6.348" tall sidewall, theres 2 sides so x 2 = 12.698 + rim size (15) = 27.698" tall

I've been told 27.4" is the right size by several. Any thoughts?