Raptor , its not so bad to admit you're wrong , especially when you are evidently , undoubtfuly wrong.
Insisting that 121' - 7'5'' is 33'' makes you look like a stubborn and illiterate fool , which we all know you are not.
Your conversions were ALL wrong
121'' is NOT 308cm
Even if it was , 308-226 = 82 , that is 32,28'' , NOT 33''
Rim heights are rim heights , NOT rim heights minus rim thickness.
Just use the
and let it go man...