How do I adjust my rear derailleur for better shifting?
Hop off your bike and do this: Shift your chain into the biggest chainring and smallest cog, then loosen the cable clamp bolt (where the cable attaches to the derailleur). Leave the derailleur in the smallest cog and adjust the high limit screw. Push the derailleur in the largest cog and adjust the low limit screw.
How does the B screw affect shifting?
The B-screw controls the body angle of the derailleur. It pulls the pulleys away from the sprockets, so you don’t rub against them. If you set it in the largest rear cog (as you should), when you’re adequately clear, you don’t have rubbing.
How do you fix a derailleur skipping?
To fix a skip in the rear derailleur, shift your chain into the smallest ring on your rear cassette (the hardest gear) and the middle or larger ring on your front derailleur. Press your shifter once. If the chain doesn’t move up a gear, you need to add tension.
Which way do you turn a barrel adjuster?
To do this, turn the barrel adjuster (see below) counter clockwise. If the chain is not shifting well from the largest to the smallest chainring, then the inner wire tension needs to be lowered. To do this, turn the barrel adjuster clockwise.
How tight should derailleur screws be?
Similar to the H screw setting, make the L screw too tight and back it out slightly until it is just right. This will provide the most protection from the derailleur shifting the chain beyond the largest cog and into the spokes.
Why is my derailleur touching my cassette?
When the spring breaks or wears down, the derailleur becomes “weak”, and the chain pulls it forward too much. In some cases, the derailleur assumes an awkward position causing rubbing against the cassette. If you have a bad derailleur spring, the solution is to replace it or buy a new derailleur.
What does barrel adjuster do on rear derailleur?
That’s a barrel adjuster, which is used to tune the derailleur adjustment. Standing behind the bike, the barrel adjuster is turned either counter-clockwise or clockwise in half-turn increments until the shifting hesitation is cured.