With its race-optimised, FACT carbon frame, efficient handling, and increased 19% stiffness-to-weight ratio over the previous Tour de France-winning version, the Tarmac SL4 has plenty of Pro-Tour proven speed up its sleeve. Simply put: nothing is lighter and stiffer. That’s why it’s the go-to choice of the pro peloton. Ride it hard,
ride it fast, just wind yourself up and go.
WHAT High modulus carbon frame made from our most advanced carbon construction method.
WHY Gives our Tarmac the highest stiffness-to-weight ratio ever—19% greater than SL3 S-Works—which makes for an insanely light and efficient bike.
HOW Divides frame into four monocoque sections (plus dropouts)—with carbon fibres running continuously from tube to tube within each section—for more precise optimisation of tubes shapes, sizes, and joints.
TAPERED, SHAPED HEAD TUBE
WHAT Strategically designed head tube on SL4 frames tapers from 1-1/8” at the top to 1-3/8” at the crown and facilitates massive top and down tube junctions.
WHY Increases strength and stiffness for greater steering precision and responsiveness during out-of-the-saddle efforts.
HOW The wider base creates a stiffer, stronger junction, and the gradual transition of carbon fibre from top to bottom eliminates the potential for weak spots due to sharp angles—carbon is at its best when it keeps a smooth line. Uber-oversized top and down tubes “wrap” around the front of the head tube, creating the ultra-stiff “bulges” at the junctions. The design requires a smaller lower bearing (compared to last year’s 1-1/2”) which saves weight.
WHAT FACT construction with bottom bracket and chainstays constructed as one piece on most frame levels.
WHY Optimises weight and stiffness in one of the most critical and highest-stress areas of the frame for superior acceleration, efficiency, and handling.
HOW The BB and chainstays are moulded together creating a single unit, rather than bonded together after molding, along with the carbon BB shell. This results in a super strong and stiff unit: seamless from the BB to the dropouts, eliminating potentially weak junctions. This design resists deflection under extreme pedal loads for improved power transfer.