Harry's new bicycle

In preparation for the Oxford to Cambridge ride on the 27th of September. Fringe benefit is that it cuts the journey time from Comberton to Cambridge from 35 minutes to 24, without trying hard. The gears, drive train, chain, brakes are made of steel, the frame from other materials, all of which can be found in steel at various concentrations. The tyres contain quadruply twisted steel "bead wire" for better flexibility.