Mounting the Shimano derailleurs

There is no difficulty in mounting the Shimano derailleurs. On the other hand, there are a few small gestures to know to settle them precisely!

Mechanical summary

The Tools

To mount and adjust Shimano derailleurs you will need a 2 mm Allen key, a 4 mm and a 5 mm Allen key. It will also be necessary to add the allen wrench that tightens to screw the derailleur legs and a Phillips screwdriver for the races of the derailers. A torque wrench is also added to tighten the torque.

Pictures © Frédéric Iehl

  • Clé dynamométrique avec douille

Time and difficulty

It takes one hour of work to set up and adjust the Shimano derailleurs. It’s not that complex, except for the front derailleur. A small gap and the ascents and descents of chainrings will be less frank.

Stage 1

Mounting the Shimano derailleurs

We start by checking the tightening of the rear leg. It is visually controlled that it is not twisted.

Stage 2

We do the same for the front derailleur. Little chance here that she twists.

Mounting the Shimano derailleurs

Stage 3

Mounting the Shimano derailleurs

The front derailleur is then positioned so as to adjust it in height. It must be slightly tight.

Stage 4

We start by positioning the derailleur in height. The fork must pass between 1 and 3 mm above the teeth.

Mounting the Shimano derailleurs

Stage 5

Parallélisme du dérailleur avant.

Now we will orient the front derailleur so that its outer face is almost parallel to the teeth of the large plateau. The rear end of the derailleur can be shifted from 0.5 to 1 mm inwards.

Stage 6

The front derailleur is then tightened permanently.

Mounting the Shimano derailleurs

Stage 7

Mounting the Shimano derailleurs

We place a 5 mm allen wrench like this along the teeth of the tray and look at the gap with the fork.

Stage 8

We then play on this screw to bring closer (green) the fork or take it off (orange).

réglage du dérailleur arrière

Stage 9

Mounting the Shimano derailleurs

We start by greasing the derailleur hanger.

Stage 10

We tighten the derailleur thoroughly on the derailleur hanger

réglage du dérailleur arrière

Stage 11

réglage du dérailleur arrière

We avoid crushing this screw on the derailleur hanger.

Stage 12

We then make sure that the derailleur rotates freely on the derailleur hanger.

réglage du dérailleur arrière

Stage 13

réglage du dérailleur arrière. dérailleurs Shimano

There are 3 screws on the back of the derailleur. The A is for the running of the small pinion, the B for the running of the large pinion and the C to manage the gap between the pulleys and the pinions.

Stage 14

Small chainring-big sprocket, we make sure that the derailleur does not touch the spokes. We then act on the B screw.

réglage du dérailleur arrière

Stage 15

réglage du dérailleur arrière. dérailleurs Shimano

Large chainring-small spocket, we make sure that the chain runs without noise and does not rub on the frame. We then act on the A screw.

Stage 16

The pulleys train must also be as close as possible to the sprocket. Here we will reduce the distance a little.

réglage du dérailleur arrière. dérailleurs Shimano

Stage 17

réglage du dérailleur arrière. dérailleurs Shimano

We modulate the gap with the C screw. When we tighten (green) we move away, when we unscrew (orange) we bring…

Stage 18

On the front derailleur, the A screw is used for the race of the small chainring, the B screw for the race of the large plateau.

réglage du dérailleur avant. dérailleurs Shimano

Stage 19

réglage du dérailleur avant.dérailleurs Shimano

We put the chain on a small chainring and the large sprocket and look at how it goes.

Stage 20

We screw the A screw to bring the fork closer together, we unscrew it to keep it away. It must brush against the chain but without touching it.

réglage du dérailleur avant. dérailleurs Shimano

Stage 21

réglage du dérailleur avant. dérailleurs Shimano

We put the chain on the large chainring and the small sprocket. We look at where the fork goes. Here too, it must brush against the chain without touching it.

Stage 22

The B screw is then acted by screwing it closer to the fork of the chain, or by unscrewing it to move it away.

réglage du dérailleur avant. dérailleurs Shimano

That’s it, it’s installed, all that remains is to adjust the Shimano indexation.

Mechanical summary

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