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@user142089
650c is probably what Fabzzzz meant. 650b is the MTB 27.5" standard and it will be hard to find slim tyres to fit that rim.
You can also get a 26" rim with skinny tyres (those are easier to find with either slim tyres - though they're most commonly found with vintage MTBs) or you can also go for a 24" front wheel.
24" wheels are weird because their rim diameter standard differ and thus you'd have to check the ERTRO. The 24" I run, for example, is 540mm in diameter (got it from a kids road bike) and it works nicely (somehow the fakies seemed easier? But don't quote me on the physics of it. It might have just been me getting better)