Our rim technology - Venn Cycling

Our rim technology

Key features and benefits of our rims

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

Every rim undergoes tire 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. Our standards are among the highest in the industry.

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

Slit tape filament winding differs from wet winding in that the tape already contains preimpregnated resin and thus delivers a more stable resin content. Image for illustration only. Copyright Connova.

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

Example of slitting machine for illustration only. Copyright Mikrosam.

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 your 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 fiber 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. We therefore perform two additional post-cure cycles for additional 14 hours. This results in your rims being fully cured, and therefore entirely stable once you start using them.


Reference: Cure kinetics of several epoxy–amine systems at ambient and high temperatures, M. Pramanik et. al. Link