VEVOR Rodillo de Entrenamiento para Ruedas de 660,4-736,6 mm, 6 Niveles de Resistencia, Plegable, Magnético, con Liberación Rápida y Almohadilla para Rueda Delantera, Color Negro, Carga de 150 kg

Yes, the wheel diameter (29") will fit, but there are two critical compatibility checks you must verify on your Rockrider before buying: 1-Check rear axle: QR fits automatically; Thru-Axle requires a separately sold adapter. 2-Consider a slick rear tire: To avoid loud vibrations from MTB knobs on the roller. If this answer doesn't resolve the current issue, please reach out to us again for assistance.