How to Build Up a Bike

Step 20 Tuning

So you can run your cables to your brakes and derailleur now. When setting the rear one up you want to first set the limits.

There are two screws on the back of the derailleur, the lower one is the inner (biggest) gear and the higher one is the outter, Remember this "Linner Houtter".
By setting the limits you keep the chain from going up into the spokes or down in to space between the dropout and the smallest gear.

Then you can fine tune your derailleur by using the barrell adjuster. The key is to get the teeth on the pulley to line up with the teeth of the gear you are suposed to be in.