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Attach your front derailleur exactly where you want it with the ShiftFIx. Simply clamp the ShiftFix on your frame on the right height and attach your derailleur on the ShiftFix, adjust everything a little bit and you are ready to go! Easy, lightweight and good looking! • Aluminum front derailleur clamp. • For frame tube diameters: 31.8 and 34.9 mm. • Weight: 25 grams (31.8 mm) and 27 grams (34.9 mm).