![]() ![]() Their number of teeth also varies from each other. Each sprocket has its own size, which is different from its other counterparts. SprocketĪ sprocket is also known as a cog, which is among the many cogs located in the cassette. Meanwhile, premium bikes that have 1x drivetrains only have a rear-wheel derailleur. Most budget bikes have a front derailleur and rear derailleur. In simpler words, it moves your chain to another cog so you can gain the required speed and amount of effort needed to go past trails. Derailleursĭerailleurs are the technical component of a drivetrain that is responsible for shifting your gears. The top-of-the-line bikes have 12 gears in total. However, there are higher-end models that have more cogs. It usually has 7 cogs in it, which means that it is a 7-speed bike. This contains multiple cogs or gears ranging in different sizes. CassetteĪ cassette is a group of sprockets or cogs found at the back section of your drivetrain. It is also attached directly to your right crank, just on the side of your right foot. This can be found on the front section of your drivetrain. The chainring is a ring that has multiple teeth on its sides. The first term you should know is the chainring. Important Terminologies to Know Chainring It’s all a matter of knowing your required speed so you can choose the right gear. On the other hand, you can shift to the smallest cog if you want to go as fast as possible when riding downhills or flat section trails and paved roads. Shift to the biggest cog if you want to have more power when climbing uphills. The cogs also vary in size, ranging from the biggest to the smallest. This serves as the speed option for the rider. ![]() ![]() Although this depends on the number of chainrings a bike has, a 7-speed bike usually means that there are 7 cogs found at its rear. Maybe this is where the appeal of a 12-speed cassette really comes in.A 7-speed bike is a kind of bicycle that has a drivetrain with 7 gear speeds. This single-ring set-up at the front has weight and mechanical benefits, both in terms of the missing ring and also the missing gear shifter and cable, although it can never replace the full range of gears in a double-ring set-up. SRAM has a selection of single-ring groupsets designed for road bikes, having previously introduced them for the mountain bike and cyclo-cross markets. This is to give you a wide spread of gears no matter which chainring you are in. This weight gain has been largely negated over the years with the use of lighter materials, and careful drilling and machining of parts to lose mass, but in some instances this has had a negative effect on longevity.īikes with two or more chainrings will have a crossover of gears: the lower selection of gears when in the large chainring is equivalent to the higher selection of gears in the small chainring. Weight is also an issue - more sprockets means more metal. A new shifter and swap to a narrower, compatible chain and chainrings to achieve an efficient drivetrain. You cannot simply slap an 11-speed cassette on a 10-speed bike, and the same would be true of 11 to 12-speed. Of course, this isn’t an issue with the new breed of electronic gears that auto-adjust themselves.Īnother drawback is that it’s tricky to upgrade. But that also means that there is less tolerance to misaligned derailleurs, sticky cables and worn chains. Less of a gap means less leverage needed to ship the chain from one cog to another. Having less of a gap between sprockets is a double-edged sword when it comes to shifting performance. > Should you worry about chainline efficiency? Rim manufacturers have experimented with ways around this - some using offset spoke holes to reduce the effect of dishing. This has certain strength implications as you may remember from your school physics lessons the strongest shape is an isosceles triangle with equal angles at its base. The only way to accommodate the larger cassette is to ‘dish’ the rear wheel, so that the spokes on the drive side are shorter from the hub to the rim. However, the distance between the dropouts on frames has not changed. ![]() Despite manufacturers reducing the physical width of the sprockets on the cassette, the gaps between them and the width of the chain, the width of the cassette has slowly crept up. The disadvantages of increasing cassette size are perhaps slightly less obvious. ![]()
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