It’s not a standard option. But fenders are useful for commuter bikes where the riders need to arrive clean, without mud splatter up their backsides. The add-on shields clothes to a certain degree. SKS has a new fender, the Commuter II Fender, which will replace its existing Commuter Fender.
One big change in the new Commuter II Fender is the use of CAB plastic instead of PET plastic, which SKS previously used. CAB plastic (cellulose acetate butyrate) is wood-based. It produces a glossy surface that is permanently weather and UV-resistant. The material produces a flexible product that stands up to years of use in all kinds of weather conditions.
Alternatively, PET plastic (polyethylene terephtalate) is derived from the family of polyesters. The material is flexible and glossy when new, but breaks down after years of hard use.
While CAB plastic is the primary material, the mudguards are produced with two different plastic materials in a sandwich with aluminum foils.
SKS says Commuter II Fenders have several advantages to additional advantages. Commuter II features two points of fixation for extra stability. It uses 3.1 Stainless V-Stay that’s more secure. Commuter II offers significantly extended coverage on both front and rear over the old style SKS Commuter.