Imported Products › Uflex UP39 Rear Mount Helm [UP39R] Image 1 of 1 Uflex UP39 Rear Mount Helm [UP39R] $1,033.71 UP39 Rear Mount HelmSpecifications: Mounting: Rear Mount Displacement/Revolution: 39 cc - 2.4 cubic inches No. of Pistons: 7 Relief Valve Setting: 70 Bar - 1000 PSI Maximum Wheel Diameter: 710mm - 28" Weight: 5 kg - 11 lbs. Add To Cart Added! UP39 Rear Mount HelmSpecifications: Mounting: Rear Mount Displacement/Revolution: 39 cc - 2.4 cubic inches No. of Pistons: 7 Relief Valve Setting: 70 Bar - 1000 PSI Maximum Wheel Diameter: 710mm - 28" Weight: 5 kg - 11 lbs.