 The new 101 wheelset featured the first aluminum clincher rim with a fully toroidal profile and reaches a lower price point than Zipp's carbon wheels.2010 also saw a redesign of the 303 wheelset with claimed improvements to strength, durability, and aerodynamics.Currently, the most popular wheel made by Zipp is the 404 Firecrest clincher wheelset, known for its lightweight dimpled 58mm deep rim.