Apico Trial chain sliders are an aftermarket up-grade from the OEM stock product. Manufactured from P.U.R polyurethane to better withstand the friction and abrasion from your bike's chain. Our chain sliders are designed to be durable and perfectly fit your Trial bike. FRONT CHAIN SLIDER - BLACK OEM - 52170-NN4-000 MONTESA 315R 97-04 4RT 250 05-13 4RT 260 14-24 4RT 300RR 16-18 4RT 301RR 20-24 4RT 4-RIDE 16-24