Donnelly (the tyre company you may previously have known as Clément) is adding 650b tyre sizes to the lineup. For the moment this is mainly within the X’Plor, adventure/gravel tyre range.
The X’Plor Strada USH will now be available as both 650b x 42 and 650b x 50 versions. It will have a 60 TPI wire, folding or tubeless-ready casing.
The X’Plor Strada USH uses a combination of the Strada LGG herringbone 'lugs' (though using a scaled-up tread) and fast-rolling X’Plor USH centre tread. The 42c version has the equivalent diameter of a 700 x 23c tyre.
The X’Plore MSOhas been updated to include 650b x 36 and 650b x 50 (the 50c is not available yet, but will be soon), in both a folding bead and tubeless ready. In the larger size the outer diameter equates to a 700 x 32c tyre.
The MSO tread remains the same as the original model using a soft rubber compound with tightly packed centre knobs for better rolling resistance and more aggressive shoulder lugs for cornering traction.
The above tyres will retail at $30 for the wire bead version, $46 for the folding bead version and $67 for the tubeless-ready model (no UK pricing available yet).
Finally, the MXP, originally a cyclocross tyre, will also be available in 650b x 33. This offers an all-condition tread that Donnelly claims is good for everything including grass, loose dirt, sand, mud, hard pack and pavement.
This will retail at $46 for the folding bead and $70 for the tubeless-ready version.