Spanish component maker Rotor is bringing out a new mountain bike stem which it claims weighs just 83g.
The firm, which made a name for itself with its cranks and elliptical Q-Rings, says its SL stem has set a new record for light weight without sacrificing performance or rigidity.
It puts this down to the new DTT (double thread technology) Evo hardware used in the faceplate and steerer clamp. This consists of special T25 Torx-head bolts with a dual-thread pitch design, which Rotor claims give “an incredible tightening force”.
The two-bolt SL stem has a 6º rise/drop – it can be flipped depending on your preference – and takes a standard 25.4mm handlebar.
DTT Evo bolts will be used on all Rotor stems in 2009. They will also be used on the firm’s new Agilis Evo cranks, which will feature a lightweight steel bolt in place of the aluminium one used on the ’08 Agilis cranks. Rotor says this improves reliability and makes the cranks easier to adjust, with no weight penalty.