Originally Posted by
preventec47
The diameter/circumference of the outer edge of the rim does not determine the tightness when installing a tire. If the depth to the bottom of the inner part of the
rim is greater, then on the other side of the rim, the beads of the tire can be pulled down into the rim deeper making the rire easier to mount by giving more slack on the
side of the rim you are trying to push the beads over on.. Further, some rim designs differ in the distance between where the bead of the tire seats and the outer most
edge of the rim. Clearly some rim designs would be easier to mount than others even when the bead ridge measurements are the same dimensions.
FINALLY!!!! I had to read thru 6 pages to get to someone thinking this question thru all the way….To re-phrase the above, when you are pushing that last bit of tire bead over the rim, 90% of your bead is pushing against the inside bed (center) of the rim, NOT the outer edge…so yes, you can sand down a few microns without going horribly out of balance or weakening the rim for “around town” use, but at the same time, do a bit of sanding inside the rim to get that bed down—a few microns there (if you think the bed is thick enough to handle a bit of “sandpaper wear”) will have a greater impact. A very smart early post mentioned replacing the rim tape with thinner stuff…even more brilliant.
Jon…your patience is admirable—you asked a question you knew was outlandish and kept your head when the ******** started to fly. Think about where that tire is bedding—that’s what’s too ‘big’— maybe compare that measure with the other rim? Best of luck!