The short answer
Modern road bikes are commonly sold with about 22 or 24 gears, usually a two-chainring front set combined with an 11-speed or 12-speed cassette. Older road bikes often have fewer, for example 16, 18, 20 or 21, and some newer bikes use a single chainring with a wide cassette. The exact number depends on the bike’s age, price and groupset (the set of drivetrain components).
How the number is calculated
Multiply the chainrings by the rear cogs:
- 2 chainrings x 11 cogs = 22 gears
- 2 chainrings x 12 cogs = 24 gears
- 1 chainring x 12 cogs = 12 gears
- 3 chainrings x 7 cogs = 21 gears
If you need a refresher on the parts, see bike gear names or our bike gears diagram.
Common road bike setups
- Double (2x): the traditional road setup. Two chainrings give a wide range while keeping small steps between gears.
- Single (1x): one chainring and a wide cassette. It is simpler to shift and removes the front derailleur, but you have fewer gears in total.
- Triple (3x): found on older bikes and some touring bikes. It gives very easy gears for climbing.
Nominal versus usable gears
The headline number overstates how many different gear ratios you have. Many combinations are close to each other, and some are best avoided because the chain runs at a sharp angle (for example, the large chainring with the largest cog). A 2x11 bike therefore has fewer genuinely distinct, comfortable gears than 22. In practice you will use some of them a lot and others rarely.
52/36 versus 50/34
These numbers are the tooth counts of the big and small chainrings. A 52/36 is often described as a “standard” road crankset, and a 50/34 as a “compact”.
- 52/36 offers a taller top gear for fast riding and strong riders, but the easiest gear is harder.
- 50/34 gives an easier lowest gear, which many riders find helpful on steep or long climbs, and still allows reasonable speed.
Neither is better in general. It depends on your fitness, terrain and the cassette paired with it. A cassette with a larger biggest cog can make up for a bigger small chainring. For choosing gears on a climb, see which bike gears to use on hills.
What are the lowest gears?
The lowest (easiest) gear is the smallest chainring combined with the largest rear cog. “Lowest” means easiest to pedal, not slowest to make progress. Road bikes with a compact crankset and a wide-range cassette usually have easier low gears than those with a standard crankset and a tighter cassette.
How mountain bike gears compare
Mountain bikes generally use a wider gear range to cope with steep trails, often with a single chainring at the front and a large-range cassette at the back, though two- and three-chainring setups are common on older bikes. The principle is the same: small front ring and big rear cog for climbing.
Which setup to choose
For general road riding on mixed terrain, a double with a compact crankset is a common and flexible choice. If you ride mostly flat ground or want less maintenance, a single chainring may be enough. If you are unsure, ask a shop to compare the actual gear ranges for your riding area. If you have a one-speed bike and want more options, see adding gears to a single speed bike.