Shimano GRX Ltd show bike

Shimano GRX Ltd show bike
Back in the spring, Shimano asked if I would do a build to be shown at Unbound to display their limited edition polished silver GRX group and new carbon wheels.
I took the opportunity to prototype some ideas, essentially testing a disc brake version of the Cane Creek bike, with some additional changes to the design and geometry.
There is a custom butted 1” seatmast, curved for tire clearance and with a custom internal wedge Thomson seatpost. A truss chainstay design – mirroring the fork and assisting in providing up to 50mm tire clearance with a double crank and short (416mm) chainstays.  The oversize headtube has an internal sleeve between the bearings so the cables and hose can run internally, entering at the headtube, and have no interference with the steerer tube.
There are four bottle mounts and internally brazed bosses for a framebag. The front brake caliper attaches using direct mount bosses as more usual in the rear, positioned to suit the 160mm rotor.
The frameset has a powdercoat applied by Custom Powderworks, and the final weight is 19.5lbs. Many thanks to Shimano for the opportunity!

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