There isn't significant difference in diameter between 22.2 and 24 to affect feel. It is to make sure that brakes and shifters are not interchangeable between MTB and ROAD bicycles. Bar tape assumes a ROAD handlebar. Just one side will do both grip areas of an MTB or any other kind of flat-bar, and then some, and then some more, and you will still have the other side not even touched. I know there are exchange clubs where amputee's can swap the unused shoe of a pair that they don't need but I don't know of a site like that for unused bar tape (or grips). Cutting down grips is done all the time, and some grips even have scoring to aid the process. There are grips with integral bar ends. FWIW.

H