WTB's Speed She boasts a Flex-Tuned shell and fantastic padding for ultimate comfort. The wide-platform rear supports riders of all abilities and shapes, and the extra-long rails allow for better bike fit. Streamlined, rounded edges provide great maneuverability and better weight shifts on the bike. And, WTB's Comfort Zone ensures your backside will feel good the next day. Satin Steel Rails. Size: 143 x 240mm. 400g.