The input and output axes are in the same line. The advantages of the planetary gearheads are: 1. For a double-stage planetary gearhead, the carrier of the first stage becomes the sun gear of the second stage.

So, quite simply, more gears means more scope to find your preferred pedalling speed.The Planetary gears are also called as an epicyclic gear train, it is a combination of the ring gear and spur gear. The same is true of your body pedalling a bike. Sun gear is located at the center that transmits torque to planet gears orbiting around the sun gear.Continuing with the car example, using too low a gear at high speed would result in high fuel consumption. The center gear is the sun.Planetary Gear: Intro planetary gears also refer as epicyclic gearing consisting three elements sun gear, planet gear and ring gear. A planetary gear set has three parts. This is what allows you to change your car gear ratio without having to engage or disengage a clutch.

Modern 11-speed cassettes with the same spread, 12-25, would have only single tooth increments for the majority of the shifting.An explanation of a planetary gear set and why clutches and brakes are essential to it. To put this into perspective, in the days of five or six-speed cassettes, a range of 12-25 teeth could only be achieved by having sizeable gaps between sprocket sizes. The third one is planet gear which is mounted between Sun and. The second gear is ring gear which is act as a housing for gear assembly.

They're also used by some racers (hill climbers for example) who want to drop weight and cut down on any extra complication coming from the shifting process - in this case, choosing the correct gear ratio is crucial. These still have a gear - which is determined by the size of the front chainring and rear cog.Singlespeed bikes are popular among commuters living in flat areas, because they require little maintenance. Cyclists are much more able to fine-tune their pedalling speed to suit the gradient or terrain, often resulting in a lower energy cost.Why do some people opt for a single speed bike?You don't have to ride a bike with gears - some people choose to ride singlespeed bikes.

HereвЂ™s the lowdown to put you on the right track.Two chainrings at the front paired with up to 9, 10, 11, or 12 sprockets at the rear.A classic 53-39t combination is known as a 'standard' chainset, though it is largely unused by recreational cyclists and very rarely specced on bikes by manufacturers.A standard double set-up is usually the preferred choice for racing, offering the largest chainring sizes for the biggest gears possible to keep you pedalling smoothly when speeds are high.Some reduction of the lower gearing is possible, but only as low as a 38t inner chainring, so if itвЂ™s low gears youвЂ™re after, a standard double is not the best way to go.A compact is essentially a double set-up, only smaller. The trick is to know whatвЂ™s what, so youвЂ™ll be able to decide what will best suit your riding. See the diagram below for an illustration of this.So youвЂ™re not always getting 33 gears at your disposal, but itвЂ™s not some kind of marketing trick by manufacturers, to slyly cheat you out of gears, itвЂ™s simply the nature of the beast.As weвЂ™ve already said, the total number is not the selling point, instead itвЂ™s the ability to have such a continual progression of closely spaced gears.ThereвЂ™s no need to struggle these days because there are heaps of gearing options available so riders of all abilities can get the most from their pedalling. Old-fashioned advice, which is still relevant, is to avoid вЂcrossing the chainвЂ™. For example, 53x19 is the same gear as 39x14.Also, certain вЂcrossoverвЂ™ gears, at the extremes of the range, may not be recommended for use, due to the additional strain that is placed upon the chain. In other words, some gear combinations will result in the same ratio as others using a different sprocket and chainring.

The overall result is that you can reach a higher resistance at the top-end, and your smallest gear is even easier to push.The new SRAM Red eTap AXS with its innovative gearing ratiosApex was the first of a new wave of вЂsuper-compactвЂ™ gearing. On the back, the 12-speed cassette starts at a 10-tooth cog, and increases by 1-tooth per cog. Available on a SRAM Red eTap or Force build, the groupset offers smaller chainrings - available options areВ 50/37T, 48/35T, and 46/33T. A triple is the preferred choice for riders looking for a вЂbail-outвЂ™ option, often those regularly riding in very hilly regions.ItвЂ™s also beneficial for laden touring when baggage makes the battle against gravity even tougher.In 2019, SRAM launched its AXS groupset. The third chainring is usually 30t or smaller, which when paired with a large ratio rear cassette, can provide an extremely low gear for use on steep climbs. ItвЂ™s a highly popular choice as the reduction in gearing at the lower end is enough for most to tackle even Alpine climbs, yet there is not a huge reduction of the top gear, still allowing fast descending.Semi-compact chainsets surged in popularity in the last decade, and they are usually the go-to front chainring combination for those bikes sold with a Shimano/Campagnolo double-ring setup.The semi-compact chainset offers a 52t outer chainring (one tooth smaller than the standard, but two teeth bigger than the compact) paired with a 36t inner ring (three teeth smaller than the standard and two bigger than the compact).This combination offers the best of both worlds the 36 inner ring can be paired with an 11-28, 11-30 or 11-32 cassette at the rear to offer enough gears to tackle almost every climb, while a 52t at the front offers a bigger gear for fast group riding, descending, and even racing.Having three chainrings brings the possibility of adding a much smaller gear option.

The language ofВ bike gearsChainring: toothed ring at the front end of the drivetrain, attached to the crank.Cassette: cluster of sprockets at the rear of the drivetrain, containing up to 12 gears, of various sizes.Block: another term for the group of rear sprockets, but really refers to the older, screw-on freewheel.Derailleurs: front and rear derailleurs do all the hard work of moving the chain from one sprocket (or chainring) to the next.Sprocket: refers to an individual gear within the cassette/block.Ratio: describes the relationship between sprockets and chainrings, for example вЂ53x12вЂ™, or the sprockets on a cassette (11-28).T: short for teeth вЂ” to describe how many a given sprocket has вЂ” for example вЂ23tвЂ™.Drivetrain: term grouping together all the moving parts that connect the crank to the rear wheel and hence drive a bicycle along вЂ” namely the chain, the cassette and the chainrings.Cadence: pedalling speed, measured from how many revolutions the crank makes per minute вЂ” expressed in RPM.STI lever: abbreviation of вЂShimano Total IntegrationвЂ™ вЂ” a term for ShimanoвЂ™s design combining brake and shift levers for road bikes, but often (mis)used generically to refer to the shift/brake levers regardless of brand.Ergo lever: CampagnoloвЂ™s name for its version of integrated gear shift and brake levers (ie CampagnoloвЂ™s STI).DoubleTap lever: SRAMвЂ™s slice of the pie, in terms of shifter technology вЂ” uses the same lever for upshifts and downshifts. The left-hand paddle button moves the chain up the cassette into an easier gear.To move the chain between the two front chainrings, the rider simply needs to push both the left-hand button and right-hand button at the same time and the chain will move up or down depending on its starting position.

Planetary Gears Explained