Venn Var 77 TCD filament wound tubeless clincher disc brake carbon rim

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

 

 

 

 

 

 

 

 

 

The profile of the Var 77 TCD rim was developed using the world first artificial intelligence driven process to offer the best aerodynamics when used with 25-28mm tires. The external width of 30mm optimizes the airflow in combination with wider tires, while the internal width of 21mm ensures that the wider tires achieve a stable, round profile.

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

Above: transient airflow simulation of the Var 77 rim showing very good airflow attachment and minimal turbulent wake creation. The surface pressure plot additionally shows that there are no sudden pressure drops that would lead to premature separation of the airflow.

The rim width also means that the rims are laterally very stiff while the filament winding process ensures that the rims remain vertically compliant due to the 45 degree fiber layup bias. The combination of these features results in very fast, safe handling wheels that can be used in any conditions.

The rims are compatible with clincher, or tubeless tires that when used with a sealant virtually eliminate the inconvenience of having a flat tire away from home, or during a race.

Manufacturing technology	Machine filament wound
Brake compatibility	Disc
Tire type	Tubeless/clincher
Size	29", 700c
Width	30mm external, 21mm internal
Depth	77mm
Rider weight limit	110kg
Hole number	24 holes
ERD	484.2mm