What do you do when the rim you like isn’t available in hookless version and you would like to free up some extra internal width that the existing bead hooks occupy?… You get the rim anyway and butcher it! Hooks are overrated anyway and even pirates don’t use them these days.
Having spent a few months enjoying 28mm (31-32mm) tyres at 60/40 PSI on 25mm internally wide Mavics XA as an experiment (previous post) I wondered how long it would take for Light Bicycle to launch some new school, properly wide, deep section carbon rims in response to products like e.g. eye wateringly expensive Enve 4.5. AR disc
Well, it didn’t take too long before I stumbled upon their new design – RR56C02 30mm wide (23mm internal) and 56mm deep, U/V-shaped clincher, the widest road rim they’ve made so far.
I was hoping to order a hookless version measuring 24.5mm inside but it unfortunately turned out not to be an available option.
I decided to order the rim anyway and to cut off the bead hooks to free the extra 1.5mm or so of inner width and to improve the way that the tyres seat in the rim.
The wheels were fully built first in order to make manipulating of the rim easier. The front rim was butchered with a Stanley type knife due to lack of time, while Dremel with carbon specific cutting disc took care of the rear one. Both were then finished it off with smoother grades of wet and dry.
I ended up with internal width of just over 25mm from original 23mm which allow my Specialized S-works Turbo 28mm tyre to stretch to 31.00-32.00 mm at 40-60PSI.
The setup was tested at 80PSI with no blowout. With a hookless design it’s the tubeless specific tyre bead that does most of the work holding the tyre in place. As hooks also don’t contribute to a rim strength, they are effectively an equivalent of a tailbone in humans.