Gear shift exchange1/5/2024 ![]() The right-hand bike shifter operates the rear derailleur, moving the chain between cogs on the cassette. So, shift to the big chainring when you’re about to descend and shift to the small chainring when you’re about to begin climbing. Switching between chainrings causes the most noticeable jump in gear and is typically done just before you lose or gain a lot of speed, for example, before reaching a steep gradient. The left-hand shifter connects to the front derailleur allowing you to shift your chain between the chainrings at the front of the drivetrain. Conversely, a 50-10t pairing provides a larger gear ratio (5:1) than a 50-12t cog (4.16:1), making the 50-10t better for descending and riding at high speeds. You want small gear ratios for the easy gears and bigger ratios for harder ones.įor example, a 34t front chainring paired with a 32t rear cog is smaller (1.06:1) than a 34-28t (1.21:1) combination making it better for climbing. Gear ratio refers to the relationship between the number of teeth on the front chainring and the rear cog. For example, most mountain bikes have a wide gear range set lower to facilitate climbing, whereas performance road bikes have wide ranges with more high gears to facilitate high-speed riding. An extensive gear range is essential on climbing bikes or downhill bikes. | Image source: screenshotĪ gear range includes the number of gears and the distance between the highest and lowest. Gear ratios provided by a common 50/34t – 11-34t road bike drivetrain. This overlap means you may only add eight or nine unique gears instead of an extra 12 when changing from a 1×12 to a 2×12 setup. For example, the 53×23 ratio and 39×17 ratio on standard double chainset road bikes are identical gears. However, each time you add a chainring, this creates more overlap between gears. The number of gears increases each time you add cogs to the cassette or a chainring to the drivetrain. That said, most manufacturers try to minimize the number of chainrings to save weight and reduce drivetrain complexity for easier adjustments and repairs. Conversely, the smaller chainring(s) is easier to pedal.Īgain, having more chainrings decreases the gap between each gear and provides a broader gear range, allowing riders to find the correct cadence when tackling very steep gradients. The chainrings oppose the cogs, meaning the bigger the chainring, the higher the gear and the more effort it takes to pedal. Bike Chainrings - 1x, 2x, 3xĬhainrings are the larger plates at the front of the drivetrain attached to the cranks. The more cogs there are, the smaller the jump between gear changes smaller increments allow riders to maintain a smoother, more efficient pedal stroke. The relationship between cog and chainring teeth determines the gear ratios. The large cog on the cassette is the lowest/easiest to pedal the smaller the cog, the higher the gear and the harder it is to pedal.Ĭassettes contain a series of cogs up to a max of 13, each with a specified number of teeth (represented using a lowercase t, 11-28t). The cassette is a series of cogs at the rear of the drivetrain, descending outwards from big to small. *Note: many cyclists refer to high gears as ‘big gears’ and low gears as ‘small gears.’ Bike Cassette
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