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mAking ADjUstmEnts:
gEARs
Shimano derailleur
(back wheel removed for clarity)
When your gears are running properly, you should be able to select any gear
first time. There should be almost no noise, either from the chain running
over the sprockets or when you change gears. If there’s a clicking or a
clacking noise in any gear, try tightening the cable slightly - see page 28.
Try lubricating the gear cable as well.
On the other hand, if the chain starts to drop off the chainwheel or it feels
as if it’s trying to jump off the largest or the smallest sprocket, clean the
chain and both gear mechanisms with a degreaser. Then check all the
adjustments, as shown. here.
This is also a good time to check the jockey wheels for wear. On Shimano,
the top jockey wheel should have a little bit of sideways movement but the
bottom one should not. On SRAM, both jockey wheels should be free of any
play. But all jockey wheels should turn smoothly, quietly and with very little
drag, so clean and grease them if they don’t. And ask your retailer to fit new
jockey wheels if that doesn’t do the trick.
If you can’t get the gears to change smoothly and precisely, get your Retailer
to check if the cables need replacing and that the gear mechanisms and
frame are not damaged in any way.
REmEmbER, At thE REAR WhEEL:
The smaller the sprocket, the higher the gear. So adjust the screw marked
H for High. The larger the sprocket, the lower the gear. So adjust the screw
marked L for Low.
bUt At thE ChAinWhEEL:
The larger the chainring, the higher the gear. So adjust the screw marked H
for High. The smaller the chainring, the lower the gear. So adjust the screw
marked L for Low.
Test the change from the smallest
sprocket to the next. It should click up
and down without delay. If it doesn’t,
give the cable adjuster half a turn
anti-clockwise. Then test the top to
bottom change and adjust the L screw
if necessary.
Keep on increasing the cable tension
half a turn at a time until the top to
second change works really well going
both ways. Finally, flick up and down the
whole range of sprockets several times,
as fast as you can, just to check.
To set up Shimano gears correctly,
let the chain down onto the smallest
sprocket. Try turning the H adjuster
either way until the chain runs almost
silently when you turn the pedals. Then
undo the H screw another half turn
anti-clockwise.
Next, turn the pedals slowly and use
your thumb to push the gear inwards
against the spring, lifting the chain
up onto the big sprocket. Adjust the
L screw until the chain runs almost
silently, then let it jump back down
onto the smallest sprocket.
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