Originally Posted by dabac

1) where have you been looking?
Many who started riding during the 26” era still have some wheels left. If you’d been local I could have given you a pair.
2) how wide do you want those slicks?
27.5” is also known as 650B, these have the same Bead Seat Diameter, where rim and tire overlap. If you’re OK with a narrower tire, there should be a decent selection of slicks for that size, which would leave the OD about the same.