Zipp has updated its 454 NSW and 404 Firecrest wheelsets, relying on the brand’s Total System Efficiency technology to make them lighter, wider and faster than ever-before.
“We know there are four barriers to speed,” said Zipp’s Michael Zellmann. “Wind resistance, gravity, rolling resistance, and vibration. With TSE we are considering the whole package and not just aerodynamic efficiency.”
In the case of the 454 NSW, Zipp claims they reduced its rolling resistance to save 10 watts at 40kph, while shedding a staggering 420 grams of weight. In addition, the wheelset also gets the new Cognition DB V2 hub, which features a wave spring instead of magnets to engage the ratchet, while a new two-part design disengages the hub when coasting, thus reducing friction. There are also 54 points of engagement now instead of 36.
The 404 Firecrest wheelset also drops a whopping 420 grams to tip the scales at 1,450 grams, along with a wider internal width of 23mm that’s optimized for 25mm tires. Zipp also claims the updated wheels now only require 286 watts to maintain 40kph, compared to the outgoing model that required 290 watts to maintain the same speed.
Additionally, Zipp also updated its deepest section 858 NSW wheelset with a wider 18mm internal rim, along with the new Cognition DB V2 hubs with the Axial Clutch V2. Weight is also slightly down on the wheelset, coming in at 1,773 grams.
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