27.5 x2.1 tire to road
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Any 650b tire. If you have the clearance for it, Hookworms are available in 27.5 x 2.5
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Be careful of how narrow you go, modern mtb rims tend to be wider to help tire profile but you may find you can't go lower than a 650bx28 or even 30 which should roll fine and fast in comparison to a mtb tire depending on the tire pressure.
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Found this for tire/rim sizes: Tire Size Chart For Bicycle Rims (lightbicycle.com)
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Those recs are very specific to THEIR rims. And there is a huge inconsistency between what they recommend for their Road vs MTB rims: They say a 1.9" tire should go with a 19-23mm rim, but also say that a 48mm tire (Which is basically a 1.9) should go with a 24-25mm rim.
I also deleted the post, in case anyone is confused by a missing post. I've got to be more careful in the future. I did PM the OP to ignore my original response, which I deleted.
Last edited by freeranger; 09-05-21 at 11:08 AM.
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Rene Herse Switchback Hill (650x48B)