Reserve Wheels Reserve 40/44 GR Wheelset - 700 12 x 100/12 x 142 Center-Lock XDR Carbon DT 350Reserve Wheels Reserve 40 44 GR Wheelset 700 12 x 100 12 x 142 Center Lock XDR Carbon DT 350. Bringing cutting edge performance to the diverse needs of drop bar off roaders Reserves 40 44 GR gravel wheels are tailored for the demands of off road exploration and gravel riding but with an aero focus. Leveraging Turbulent Aero technology the 40 44 GR features a 40mm front paired with a 44mm rear establishing it as the fastest and most stable Reserve