The bearings from MSC fit in the swingarm great. I ran a adjustable reamer through the pivot tubes until i got the size that i thought may work or may be a bit tight, next i put in a old factory bearing in then started to put the collar in, but it felt to tight so i took the bearing back out, and gave the adjustable reamer about 1/4 turn then ran it back through, then put the bearing back in and then i put the collar in. BUT the collar was very hard to spin in the bearing so i took the collar and bearing back out, gave the adjustable reamer about 1/4 turn then put the bearing and collar in and the collar spins fine now..........