FOX Transfer SL Performance Series Elite Dropper Seatpost - 27.2 70 mm Internal Routing Anodized UpperFOX Transfer SL Performance Series Elite Dropper Seatpost 27. 2 70 mm Internal Routing Anodized Upper. Meet the Transfer SL Performance Elite Dropper Seatpost . At 128 grams (25%!) lighter than the regular Transfer post its the lightest mainstream dropper post on the market. Compatible lever options for flat bars drop bars and 1x and 2x drivetrains it (finally) brings the word shred into the super lightweight XC and Gravel conversation scene.