Spank 350 Vibrocore Alloy RimModerately low 17mm profile height and wide width, balances the benefits of radial compliance with high lateral stiffness and predictable handling Radial Compliance improves traction over bumps and chatter, while reducing negative feedback to the rider. Performance and comfort are improved Vibrocore inner well, reduces the transmission of harmful vibration frequencies, meaning less vibration for the suspension and rider, also increasing the fatigue