Set up Front derailleur limit screws / adjustment bolts (two bolt derailleurs)

Published October 21, 2019 by BetterShifting, Last updated February 16, 2021

This guide applies to front derailleurs that have two adjustment bolts (or limit screws). All previous generation derailleurs are two-adjustment-bolt derailleurs:

Before your start, make sure you have correctly setup your front derailleur height, angle and support bolt. Have a look at the front derailleur installation guide for information on how to do that.

Set the low adjustment bolt

These derailleurs have three bolts close to each other, so take a moment to identify the correct bolt to adjust. We’ll first set the low adjustment bolt and have colored it yellow in the image below.

FD low limit bolt

In order to set the low adjustment first shift the front derailleur to the small chainring. Then, shift the rear derailleur to the largest sprocket.

Now take your size 2 hex wrench and turn the adjustment bolt to set the clearance between the chain and the chain guide inner plate. The goal is a clearance (B–C) between 0 and 0.5 mm – but not so close to 0 that the chain rubs the chain guide

Adjust the FD low limit electronically

Set the top adjustment bolt

FD top limit bolt

The top adjustment procedure is similar to that off the low adjustment. You identify the correct bolt – colored yellow in the image above – and turn it to set the clearance.

Start by shifting the front derailleur to the largest chainring and shift the rear derailleur to the smallest sprocket. Now turn the adjustment bolt until the clearance between the chain and chain guide outer plate is between 0.5 and 1mm (this is the distance between B and C).

FD set up top limit screw

All done – electrical adjustment

You should now be done setting up your front derailleur. Should the derailleur not shift perfectly yet, have a look at micro-adjusting your front derailleur. Read more about micro–adjustment on this page.