QR Code Link to This Post I have a Renthal rear sprocket 51 tooth for a KTM for sale nearly new. The sprocket is in great condition with only 3 hours on it. The sprocket fits KTM 125cc-690cc 1999-2019 bikes. This sprocket comes with a ProTaper 520mx Gold Chain. Chain has tons of life left and is in great condition only used for 3 hours. Both items are in great condition and have tons of life left in them. Protaper Dirt Motocross Moto chain DID RK