Reserve Wheels Reserve 40/44 GR Wheelset - 700 12 x 100/12 x 142 Center-Lock XDR/HG 11R Carbon DT 180 SPReserve Wheels Reserve 40 44 GR Wheelset 700 12 x 100 12 x 142 Center Lock XDR HG 11R Carbon DT 180 SP. 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