Shimano 105 FD-5800 Front Derailleur
Shimano borrows the huge improvement in the front shifting from 9000 and injects it into the affordable 5800 unit. The 105 FD-5800 front derailleur delivers a shorter stroke at the lever with a lighter action. To achieve this noteworthy reduction in throw and shifting effort, Shimano uses new pivots with a longer arm to the cable pinch bolt for increased leverage. The pinch bolt is a low-profile design and the cable now runs along the lower edge of pinch bolt.
We should mention others sources of improved shifting include Shimano's polymer coated cables for light and friction-free performance with no stickiness issues. Like Di2 front derailleurs the mechanical braze-on version of the FD-5800 has a new 2mm hex support bolt that stabilizes the front derailleur against the frame by providing another contact point. The FD-5800 has a trim feature so it can be fine-tuned to be quiet in all gear combinations - even if you cross chain from time to time. All of these details add up to practically seamless front shifting so you can get Di2-like performance in a mechanical system. Compatible with standard and compact chainrings - just keep the large and small difference at 16 teeth or less.
- 89 grams
- Compatible with 46-53T outer chainrings
- New, longer pull arm for more direct and easy shifting
- More equal shifting effort across the range
- New support bolt for more stable contact to the frame