Uncategorized 4403 derailuir broken on trek sl aplha? What detailuir to replace it? Posted on March 19, 2019 by anton hamilton I have a trek sl aplha and the front derailuir is broken. Part number 4403. The seat tube is. 34.5. The 4403 is non brased.it has a removable collar.Please help . I am good got call Shimano tomorrow but I would like the forums help. Source link anton hamilton Pure Pitch Method – Master Absolute Pitch & Relative Pitch Day Trading – A Scam?