It's designed to be worn under your jersey for low-profile coverage

The components of the Defensa are made of a high-strength forged aluminum alloy

this prevents sharp stones from hitting and damaging the valve cover

SYM stock filter’s flow: 88

When the mid layer’s job is done

KimpexHD - Wheel Bearing & Seal Kit (25-1019-KIMP) Options:RR (25-1019-KIMP) It's designed to be wornKimpex high speed bearings are manufactured to ABEC 3 precision levels. Triple lip rubber seals keep the grease in and the water and dirt out. Chevron SRI 2 grease contains rust and oxidation inhibitors ( 29 C 177 C). Double lip type TC seals with stainless steel garter springs.