The zenium sl the zenium sl frame features a super light 6066 t6 triple butted alloy tubeset with smooth welds we have omitted a brace on the seatstays to help tune out road vibrations and have flared the seat tube at the bottom bracket junction to increase lateral stiffness for optimised power transfer and vertical compliance to combine the best of both worlds up front a tapered headtube and oversized tubing culminate in razor sharp handling vituss semi sloping endurance geometry offer