For exploring beyond the usual roads and trails, SHIMANO GRX RX570 wheels deliver reliable performance for diverse riding conditions. Featuring wider, 21.6 mm internal rim widths, the GRX wheels can accommodate robust gravel tubeless tires and feature CENTER LOCK disc brakes and 12 mm thru axles. Built to withstand the rigors of gravel riding, the RX570 wheels are available in both 700C and 650B wheel sizes.Gravel-Tuned Wheelset & Gear Ratios:- Wide tubeless rim limits flex under hard cornering- Inner width rim (700c and 650B)- Rotational feel similar to smaller wheelsOptimally balanced for quick and reliable multi-surface riding:- High rigidity and durability without additional weight- Straight spoke hub- MTB-inspired asymmetrical mud-shedding rim shapeSpecifications:- Average weight: 920 g- Axle_Fixing method: E-THRU- Thru Axle Length x Inner Diameter: 142 x 12 mm- Bearing_Cone: CBN finish- Bearing_Cup: Polish- Brake Type: CENTER LOCK disc brake- Compatible Spoke protector: CP-FH08 (23-28T 11-speed) , CP-WH41 (23-30T 10-speed), CP-WH12 (32T 10/11-speed)- Disc mount_Center lock:Yes- Front / Rear: Rear- Internal grease sleeve: Yes- O.L.D. (mm): 142- Rear speeds: Road 11/10-speed- Reflector_AS: CATEYE RR-550-WUA SW- Reflector_DIN: CATEYE RR-317-WUA SW- Reflector_JIS/CPSC: CATEYE RR-550-WUW SW- Rim_Height (mm): 22- Rim_Offset rim: Yes- Rim_Requires rim tape: Yes- Rim_Rim joint: Welded- Rim_Width (mm): 21.6 (Internal)- Seal_Freehub body: Contact- Seal_Hub: Contact- Spokes_Bladed: Yes- Spokes_Number: 24- Tire_Type: TubelessTechnologies:CENTER LOCK:- The CENTER LOCK system makes an easy rotor installation possible with spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency.