E 550 Stability and comfort in perfect harmony for longer rides. Do you want to customize your racing bike to save energy on long distances? Then our aerodynamically optimized rim E 550 is exactly what you're looking for. The E 550 is designed for long distances and offers the right mix of stability and comfort: With a 22 mm internal width – ideal for 28 mm wide tires – it enhances the riding experience at low tire pressure and reduces rolling resistance. This ensures maximum riding pleasure mile after mile.