stainless,
Your not bad, you said 6206. I said 6306 because that is what has been in the older bikes that I was familiar with. From '02 (maybe '01?) through '07 they used the NJ206ET roller bearing, and in '08 went to the sealed 6206 ball bearings that have the same dimmensions as the NJ206ET, so same cases. So, you can go one of three ways: sealed 6206, open 6206, NJ206ET (all C3 clearance spec). IMO I would just put the roller back in, can't wrap my head around the sealed bearing idea. One more thing to go wrong.
FYI:
6306 - 30 x 72 x 19
6206 - 30 x 62 x 16
NJ206ET - 30 x 62 x 16
For rebuilding an older bike, I've used the M306 heavy duty version with extra ball and machined cage. Still running today in an '00! The M206 is another option. Also, now there are more ceramic and ceramic hybrid choices available than there were a few years back.
This is all relative to the 250/300 only.
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