Non-TLR 6'er tire needed

Are you sure they didn't accidentally send you a 27.5 rim?

That is a good question.
I'm not sure what a 650b rim should measure but maybe i will try to mount up a tire and see.

"26" is 559mm bead diameter, and "650" is 584.

Considering it is next to impossible to mount a 590 (26 fractional) to a 597 (also 26 fractional, but different size), it's unlikely you accidentally got sent a 27.5 wheel. You wouldn't even get one bead mounted, let alone two.

Before bringing up trying to get a refund/replacement, what kind of rim tape do you have in there? If it's not tubeless tape, take it out and put in one turn of tape (Stans) or two (polyamide; super thin, very strong).

Even 1/4 millimeter woven run strips can turn some rims from difficult, to impossible to mount a tire to.

I only have a thin plastic rim strip since i run tubes. It took both myself and the shop tech along with a metal tire iron just to get one bead on. There was no way the other bead would go on. I just did a measurement on the rim. My understanding is that a 6'er is 559 and a 27.5 is 584. Mine appears to be about 568 or so--weird. I wonder if a 27.5 tire will mount up-- it is a hook bead rim.

SoftballGuy said:

I only have a thin plastic rim strip since i run tubes. It took both myself and the shop tech along with a metal tire iron just to get one bead on. There was no way the other bead would go on. I just did a measurement on the rim. My understanding is that a 6'er is 559 and a 27.5 is 584. Mine appears to be about 568 or so--weird. I wonder if a 27.5 tire will mount up-- it is a hook bead rim.

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The wall along the top is frequently fairly tall. The bead diameter of the rim is (on a tubeless rim) the flat shelf where the tire sits. On a hooked, non tubeless rim, the bead diameter is located by the bottom of the hook, minus a couple of millimeters.

Yes its a hooked non-tubeless rim. I just stopped at another LBS, he measured and claims its a 6'er rim. he said Maxxis & Schwalbes both have tight tolerances. He had a cheapo Vittoria 2.1 that went right on. I found an old Kenda Nevegal in my stash but couldn't get that mounted either. I may just end up getting another Nobby Nic, it's tight but at least i can muscle it on.