original_BT_20150917_untitled_shoot_128.jpg 1

Stealth's S4 mountain bike hubs provide instant engagement and silent coasting. For 2016 they've been updated with a better dust seal, and now use a ball bearing under the freehub instead of a needle bearing. The S4 is available with a SRAM XD drive and will be coming in the new 12x148mm Boost size soon. Below is a display showing how the internals work using several rollers contained within gently tapered slots.