Carbon wheel maker Venn reshapes their mid-depth, filament wound Var TCD rim with a new profile, adding just 2mm in depth for significant aerodynamic gains. The new Venn Var 37 TCD rim is optimized for modern wider road tires. But with a 21mm internal tubeless bead and the unique benefits of the continuous wound fibers, it can cross over to gravel riding, too.
Venn Var 37 TCD filament-wound aero tubeless carbon road rim
We’ve been keeping tabs on Venn’s filament wound for about five years now, having tested their original Var 35 TCD (Tubeless Carbon Disc) wheels back in 2016. A lot has changed since those first gen wheels, namely wider 21mm internal hooked tubeless-ready profiles that do well from traditional road to all-road, to even a good bit of gravel biking as well. But while the previous Var 35 TCD was versatile, its blunt U-shape wasn’t very aero in changing wind conditions. So Venn went back to the drawing board for the new Var 37 TCD.
What’s new in the Var 37 TCD? Tech details
The new rim is 2mm deeper and 2mm narrower for an updated 37mm deep & 28mm wide profile. Its sides are a bit flatter, but still with a blunt nose and the same 21mm internal. It also keeps hooked, tubeless-ready beads, bead-lock shoulders, and a wide inner channel to make mounting tubeless clinchers easy.
The reshaped rim is still made from continuous, machine wound towpreg, pre-impregnated carbon fiber filament tape, laid up through two 45° opposing computer controlled heads. Venn says this construction creates rims that are “laterally very stiff” and “remain vertically compliant”. The new 37mm rim adds about 30g to a claimed 450g per rim for its slightly deeper profile. The rims are available in 24 hole drilling only, and built-up have a rider weight limit of 110kg.
Var 37 TCD Improved aerodynamics
The real benefit through is the aero gains of the refined rim shape, a shortened adaptation of their 50.7mm deep Rev 507 TCD profile. Designed for reduced drag with a 28mm road tire, the new Var 37 profile actually outperforms Venn’s own 45mm deep rim across all yaw angles, and greatly reduces drag over their 35 & 45mm deep rims once the wind shifts more out to a crosswind condition.
Venn Var 37 TCD – Pricing & availability
The new Var 37 TCD is available on its own for $398 / 450€ per rim (up $28 / 25€), or as part of Venn’s custom wheel builder tool where complete wheelset pricing starts around $951 / 1077€ (€ pricing including VAT) and climbs as fast as you add fancy hubs & spokes. The new rims are available now, direct from Venn.