I just bought a new bike. Went on a quick ride to bed in the brake pads and the rear rotor looks like this. Is this normal? Shimano GRX RX400 : r/bikewrench
Shimano GRX ST-RX400 + BR-RX400 hydraulic control levers LordGun online bike store
New Shimano GRX ST-BR-RX400 2x10-Speed Hydraulic Disc STI Dual Control Brake Set | eBay
Shimano GRX BR-RX400 + ST-RX400 Disc Brake Set - bike-components
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Amazon.com : Shimano GRX ST-RX400 GRX 10-Speed STI Bled with BR-RX400 Flat Mount calliper, Right Front : Sports & Outdoors