Q: My bike was new when I bought it, but now it doesn't settle into each cog at the back. How do I adjust my gears so they stop jumping?
Dez Railor, email
A: If your gears are jumping slightly or not settling in the correct gears then the cable will have stretched slightly as it beds in. It's not a big problem, you just need to tighten up slack in the gear cable. You can do this by turning the little barrel adjusters at the shifter end of the cable.
Support the bike so the rear wheel can spin freely and shift the chain onto the smallest cog at the back. Click the shifter once. It should move smoothly into the next gear up. If it doesn't, then gradually - as little as quarter of a turn can make a difference - click the adjuster round until it does. Now shift the gears up and down across each cog to check that the chain still moves quickly and cleanly between them. If there's a problem anywhere, just tweak the adjuster a bit until it settles then recheck the whole block.