How to Shift Gears on a Bike

Gears exist to keep your legs turning at a comfortable rate whatever the road is doing. The mechanism is simple enough, but almost nobody is taught how to use it, so a lot of riders spend years in one or two gears and blame their legs.

Which shifter does what

On a modern bike with a single front chainring — a 1x setup, increasingly common on gravel and mountain bikes — there is no left shifter at all. Everything happens on the right, and the rear cassette is wide enough to cover the range on its own.

When to change gear

The target is a comfortable, steady pedalling rate — cadence — that you hold regardless of gradient. Most riders are comfortable somewhere around 70 to 90 revolutions per minute. You do not need to count; you need to notice.

• Legs straining, cadence dropping — the gear is too hard. Shift to an easier one, which means a larger sprocket at the back.
• Legs spinning fast with no resistance — the gear is too easy. Shift harder: a smaller sprocket at the back, or the larger chainring at the front.
• Approaching a hill — shift down *before* the gradient bites, while you can still pedal lightly.
• Starting from a stop — be in an easy gear already. Getting moving in a hard gear is hard on your knees and on the drivetrain.
• Cresting a hill — shift up as the road flattens so you can put the power down again.

How to shift well

The technique

1. 1

   Keep pedalling

   A derailleur moves the chain sideways while the chain is running. If you stop pedalling, nothing happens — and then the shift lands all at once when you start again, which is how chains get thrown off.

2. 2

   Ease off the pressure

   As you click, soften your pedal stroke for half a revolution. Not stop — just stop pushing hard. This is the single biggest difference between a clean shift and a crunch.

3. 3

   One click at a time at the back

   Let each shift complete before asking for the next. Modern shifters can dump several at once and it works, but it is harder on the chain.

4. 4

   Anticipate at the front

   Front shifts are slower and clumsier than rear ones. Make them early, on flat ground or gentle gradient, never mid-effort on a steep pitch.

5. 5

   Listen afterwards

   The drivetrain should go quiet once the shift completes. Persistent rattling means the gears want indexing — see adjusting bike gears.

Cross-chaining, and why it matters

Cross-chaining means running the chain at a severe sideways angle — the largest chainring with the largest rear sprocket, or the smallest with the smallest. The chain still turns, but it is being flexed laterally on every link, every revolution.

• It is noisy, and the noise is the chain rubbing the front derailleur cage — normal in those combinations, not a fault to adjust out.
• It wears the chain, the sprockets and the chainrings faster than any other riding you do.
• It shifts badly, because the derailleur is already at the end of its travel.
• The fix is not mechanical. Use the other chainring and pick a middle sprocket to get a similar gear at a far better chain line.
• Many shifters have a trim position — a half-click on the front that nudges the cage without changing ring — specifically to quieten this.

Different shifter types

When shifting will not behave

If shifts are slow, noisy, or land in the wrong gear no matter how good your technique is, the problem is the setup rather than you. Start with adjusting bike gears, which works through the four possible causes in order. If it is specifically the front that misbehaves or drops the chain, go to adjusting a front derailleur; for the rear, adjusting a rear derailleur.

And if the chain skips under load in several gears, no amount of adjustment will help — that is wear, and it is covered in replacing a bike chain.