A
Wheels
Built for riders who want to feel every gram of savings, the Realspeed RS40 SL is our lightest, most refined RS40 wheelset — engineered for those who demand race-day performance without compromise.
Its exceptional weight comes from a rim built with Torayca T1100G carbon, an ultra-high-modulus fiber that allows a lighter, stiffer layup without sacrificing strength or ride quality.
The RS40 SL's 40mm rim profile was shaped and refined in a bicycle-specific wind tunnel, so the low weight doesn't come at the cost of aerodynamics — you still get a meaningful aero advantage on the flats and rolling terrain. The hooked rim design features a modern 24mm internal width and 30mm external width, striking the ideal balance between wide tire support, aerodynamic efficiency, and compatibility with a broad range of tubeless and clincher tires.
Every RS40 SL is handbuilt in Canada, where skilled wheelbuilders hand-lace, tension, and true each wheel to exacting standards. Sapim CX-Ray aero bladed spokes reduce weight and drag, ceramic bearings minimize rolling resistance, and internal spoke nipples keep the profile clean and aerodynamic.
At just 1,180g for the set, the Realspeed RS40 SL accelerates and climbs with an immediacy that's hard to believe — uncompromising performance in a featherweight package for hilly road races, crits, and the lightest possible race-day edge.
Join the dialogue
Just technical updates, limited-edition hardware drops, and workshop reports.
