Cycling

Bicycle Gears Explained: How to Use Your Gears Properly (India Beginner's Guide)

21-speed, 24-speed, 1x, 2x: what do the numbers mean and how should you actually shift? A beginner's guide to using bicycle gears and keeping them running smoothly.

Instasport

— 3 min read
Lezyne Chain Gauge chain wear checker for bicycle drivetrain maintenance

Bicycle gears explained: what the numbers on your cycle really mean

Many people in India buy a geared bicycle with 21 or 24 speeds and then ride it in one or two favourite gears. Understanding bicycle gears makes cycling easier, protects your knees and helps your chain and cassette last longer. This guide explains how gears work, how to shift on flats and climbs, and what small maintenance habits keep shifting smooth.

How bicycle gears work

Your bike has two sets of gears. The chainrings are at the pedals (the front gears) and the cassette or freewheel is at the rear wheel. A bike advertised as 3 x 7 has three front rings and seven rear cogs, which gives 21 combinations. The left shifter controls the front chainrings and the right shifter controls the rear gears on most bikes. Newer bikes may use fewer front rings, but the basic idea is the same.

  • Easy gear (small front ring, big rear cog): less effort per pedal turn, good for climbs, starting from a stop and headwinds.
  • Hard gear (big front ring, small rear cog): more distance per pedal turn, good for flats, descents and tailwinds.

When to shift: a simple routine for beginners

  • Shift before you need it: change to an easier gear before the climb or before you stop at a signal, so you can start pedalling easily.
  • Keep pedalling while you shift, but ease off the pressure: shifting under heavy load can cause crunchy gear changes and extra wear.
  • Use the rear gears for small changes: save the front shifter for bigger changes in terrain.
  • Aim for a smooth, steady cadence: many riders find that spinning at a comfortable pace is easier on the knees than pushing a heavy gear. Our guide to cadence sensors explains cadence in more detail.

Cross-chaining: the habit to avoid

Cross-chaining means using the biggest front ring with the biggest rear cog, or the smallest front ring with the smallest rear cog. The chain runs at a sharp angle, which adds wear and noise. If you are at the end of your range on one side, shift the front ring instead.

What to do if gears skip or feel crunchy

Common causes are a dirty drivetrain, a stretched chain, a bent hanger or cable stretch. Start by cleaning and lubricating, then check chain wear. If shifting remains poor, a mechanic can adjust the derailleur indexing. Our deeper guide on the cassette and rear derailleur explains the parts in detail.

Keep your drivetrain healthy: a basic kit

Common questions about gears on Indian roads

Indian traffic means frequent stops, speed breakers and short climbs over flyovers. That makes it more important to shift down before you stop, avoid grinding up flyovers in a heavy gear and look ahead for potholes before shifting. After the rains, sand and mud also get into the drivetrain, so clean it more often.

Shop the gear

Frequently asked questions

What do 21-speed and 24-speed mean on a bicycle?

It is the number of gear combinations, found by multiplying the front chainrings by the rear cogs. A 3 x 7 bike has 21 speeds and a 3 x 8 bike has 24.

Which gear should I use on a flat road?

Choose a gear that lets you pedal at a comfortable, steady pace without straining your knees. For most riders that is a middle or harder gear on flat roads.

How do I know when my chain needs replacing?

Use a chain wear tool such as the Topeak Chain Hook & Wear Indicator (₹699). Replacing a stretched chain early can help protect the cassette.

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