Gtr sl the gtr sl has been designed for multi purpose use light and responsive for the racer yet comfortable and versatile for cycling without stress this is in large due to the use of asymmetrical chainstays and tapered seat stays the massive bottom bracket area allowed the designer to increase the stay size to improve pedal stroke efficiency by balancing the chain integrated torque the asymmetrical stays are complimented by the tapered seat stays that ensure stiffness and efficiency