Ralonge de potence DELTAImprove your ride and your posture with deltas Stem Raiser Making the decision to buy a bicycle is only half the battle to ensuring a comfortable ride. Like a pair of jeans, most bikes are designed for an average sized person, of a certain age. For those riders who are taller than average or are looking for a more comfortable position, deltas bicycle Stem Raiser and Stem Raiser Pro provide the ideal handlebar riser solution. Features Height Extension