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Kabush ran Shimano GRX RX810 calipers with 160mm SM-RT900 rotors. Geoff Kabush's 2019 Iceman Cometh OPEN WI.DE. © B. Grant / Cyclocross Magazine

Kabush ran Shimano GRX RX810 calipers with 160mm SM-RT900 rotors. Geoff Kabush’s 2019 Iceman Cometh OPEN WI.DE. © B. Grant / Cyclocross Magazine