Venn VAR 77mm, rim brake


Venn rims are designed using extensive applied and theoretical aerodynamics know-how acquired during many years of work in wind tunnels, and at the cutting edge of computational fluid dynamics (CFD)

Every rim undergoes tyre inflation test, dimensional accuracy testing, and batch testing using X-ray imaging to identify any potential lamination issues before the rims are released for sale. Venn standards are among the highest in the industry

Patented filament winding process ensures precise and accurate carbon fiber layup – each fibre is oriented exactly as intended. This ensures that every rim achieves maximal strength and durability

Accurate resin content through use of pre-impregnated slit-tape carbon fibre material. Precise amounts of resin are delivered to each part of the rim ensuring highest durability

Rim brake rims feature custom developed high glass transition (Tg) resin that resists softening and loss of mechanical properties at average temperatures of 240° C (NOTE: Tg is not a single number, but a range determined via differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA)). This almost guarantees that the rims will remain safe and functional in any real world situation (when using suitable pads, well adjusted brakes, and appropriate braking technique)

The rim shapes are formed using metal mandrels, not bladders or foam. Metal mandrels deliver much higher tolerance and molding accuracy, and prevent fibre migration during curing

Complex post cure process to completely finish the epoxy resin reactions. Resins used in manufacture of sporting goods (rims, frames, rackets, etc.) often do not in fact fully cure until several days after the initial curing (baking) cycle is completed. Venn therefore perform two additional post-cure cycles for additional 14 hours. This results in the rims being fully cured, and therefore entirely stable once you start using them

VAR filament winding process utilises slit tape towpreg to accurately lay up the carbon fiber in an automated, computer controlled process. The use of pre-impregnated carbon fiber tape allows the use of the latest resins that offer the optimal blend of high glass transition (Tg) temperature exceeding 240° C in testing , toughness and impact resistance. VAR rims can therefore be used in challenging conditions where extended braking periods are expected

The Var 77 rim profile achieves excellent aerodynamics in the real world conditions where the wind comes from different directions during your ride, not in a orderly manner as seen in wind tunnels. In fact the drag of Var 77 wheels falls in presence of cross winds.

Manufacturing technology: Machine filament wound

Brake compatibility: Rim

Brake track width: 29mm

Tyre type: tubeless/clincher

Size: 29″, 700c

Width: 30m external, 21mm internal

Depth: 77mm

Rim weight: 610g +/-15g

Rider weight limit: 110kg

Hole count: 20h front, 24h front, 24h rear

ERD: 484.2mm


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Venn Var 77 TCC filament wound tubeless clincher rim brake carbon rim.

Artificial intelligence designed parallel filament wound full carbon tubeless clincher rims. 77mm profile, disc brake compatible.

Additional information

Hole count

20, 24