The same procedure is done if you want to tune up your front derailluer.
Step 1.
Clamp and secure loosely the front derailluer on seattube just above and in line with the large chainring. Looking from the side pull the cage outward and see the bottom edge of the cage pass the tip of the large chainring teeth.
Adjust the gap between the cage and the large chainring to 1 to 3 millimeter (see photo below). Set the gap higher in case the back plate of the cage rubs the middle chainring on a triple chainring setup.
TIP: The lowest setup that clears the cage with the teeth will give you the best shifting performance.
Step 2.
Align the angle of the front derailluer over the chainring. Look at the derailluer cage from the top and position so that the outer plate of the cage is parallel with the large chainring (see photo below) Tighten and secure the clamp while making sure the cage does not move at all.
Assuming that the rear derailluer, chain and rear shifters cable are all properly installed already.
(Coming soon Related Topic: Rear Derailluer Installation, Chain Installations & Shifter Cable Installations)
Step 3.
Shift the rear derailluer to the largest cog and with the chain on the small chainring look on the top of the front derailluer and turn the low-limit screw (mark “L”) counterclockwise to move the cage away from the chain if it is rubbing from the inside or turn the limit screw clockwise if it is too far from the chain, which may cause it to over shift down and drop inside.
1mm. gap between the chain and inner wall if the cage is ideal. May need a wider gap if the chain does not shift down from the big to the small chainring.
Step 4.
Before adjusting the high-limit screw (mark “H”) install the front shifter cable. Shift the left lever all the way down. While pulling the cable use a 5 mm allen to tighten the bolt that pinches the cable.
Remove the slacks by pulling and stretching the exposed cable between the shifter and the derailluer. Loosen the bolt that pinch the cable and repeat the installation after slacks has been removed.
Step 5.
Shift the rear derailluer to the smallest cog and shift the front to the large chainring. If the chainring doesn’t want to shift up turn high-limit screw counterclockwise, Look for a smooth up shifting while hand pedaling the crank.
By looking on top of the front derailluer again adjust the limit screw until the chain does not rub in the inner wall of the cage. 2 mm. gap is ideal on top. Turn the high-limit screw too far out and you risk throwing the chain off the outside of the ring.
CHECK to make sure no rubbing occurs in the chainrings while shifting through the complete gear range in the rear and in front. If there’s rubbing, it’s not adjusted correctly.
By turning the barrel adjuster you can fine tune the shifting response. Counterclockwise you increases tension on the cable. Turning the barrel adjuster clockwise, or inward, decreases cable tension.
Rodge
