The Sun Helix 29 offers one of the stiffest all mountain 29er rims on the market, while still being light enough to pedal up the mountain. The Helix rims feature a tubless compliant profile with a 25.4mm inner width. We give you the choice to go with a Shimano build featuring Shimano XT hubs, or go all out with our fully convertible Pure D400 hubs. The D400 features 24 points of engagement with a 3 pawl free hub. These wheels are built with DT Swiss Competition Double Butted 2.0/1.8/2.0 spokes in a 32 hole configuration front and rear.