Each time the gears are being shift, the tensioner wheels are being pushed against the wall of the chain pusher. Traditional chain pusher create friction when the gears are being shifted. These bearing titanium chain pushers were CNC produced out of Ti-6AL-4V. It’s the direct replacement to the original Brompton steel pusher. They reduce friction and trim the weight down from the original parts
Net weight: 9.0 (+/- 0.5) grams/set