Chainring - transmission units for the implementation of chain transmission of forces from the cyclist's legs to the rear wheel. The chainring for a bicycle is the main part - it simply won't run without it. Single-speed models are supplied with a pair of the chainring, master, and slave. Bicycles with multistage transmissions are equipped with speed kits at the front (system) and at the rear with a ratchet or cassette.
The number and size of Chainrings determine the bike's flexibility in various road conditions. By choosing the right gear ratio in bicycle shops, you can reduce your travel energy consumption and drive at a comfortable speed. The durability of parts depends on the quality of the material, the riding style, and the quality of service - with proper care, even the "initial" Chainring will run longer than professional, but neglected ones.
Gear Ratio Leading and Slave Chainring
Chainring on speed bikes is located on the right crank arm (driven) and rear-wheel hub (driven). Through the chain, forces are transmitted from the front gears to the rear. Interestingly, the rear wheel, on the contrary, is the driving one, and the front wheel is driven.
High gears are designed for fast travel on a flat road. On hills, in headwinds, and poor road conditions, lower gears are used - the speed of the bike is lower, but more power and less energy consumption. Medium Chainring ratios such as 2 x 5 and 2 x 6 are often used.
Each Chainring system has its own cassette range. It can "float", that is, the same reverse gear applies to two Chainring systems at once, but, in principle, the pattern is as follows:
What do we have for single-speed bikes? There are only a couple of gears, the classic gear ratio is 2. Corresponds to the average performance on high-speed models, intended for movement on asphalt, compacted soil, conventionally acceptable on short climbs.
You can increase the speed of a single-speed bike yourself if you put a larger diameter Chainring in front. For frequent slides, it will be more relevant to increase the size of the rear gear.
And finally, how the programs are numbered. In the Chainring system, they are arranged in descending order, on cassettes - in ascending order. The outermost gears are the highest, the inner ones are the lowest. The smaller chainring corresponds to the first gear in the cassette, the last gear. The number of stars in front and behind determines the gearing of the transmission, for this, we multiply the numbers:
1 x 7 = 7 gears;
3 x 7 = 21 gears;
3 x 8 = 24 gears;
3 x 9 = 27 gears.
Etc. Do you need so many "speeds" in practice? It all depends on the riding style and the area of use of the bike. However, it is important to choose the correct Chainring - this way they and the chain will be subject to less wear and tear, and the rides will be more comfortable. And if the transmission allows you to select the gear with maximum accuracy, then this should be done.
Types of fixing chainring on the cassette
Let's go back to the classic round cassettes. Unlike ratchets, they differ in the type of attachment to the drums. Bicycle cassettes are:
collapsible on a single drum with separators;
on a spider;
on blocks (several spiders);
The first type of cassette is the simplest - all chainrings are mounted on a single spline drum. They are separated from each other by partitions - spacers. The disadvantage is the constant load on the drum. But the indisputable advantage is that they are easy to disassemble and change one chainring. They are easy to clean, but the components are more likely to get dirty.
Spider is a light version of a collapsible cassette. The load on the drum is not so big - here it comes not from every chainring, but only from the spider's spline mount. These cassettes are lighter and less likely to get dirty.
The Open Glide is a one-piece set that fits onto the largest gear. Unpretentious model: thanks to high-quality material, less wear, and tear, long service life, low weight. However, cleaning a heavily soiled cassette is problematic.
The X-Dome system is represented by a similar design. Here, both the big and the small stars are in contact with the drum. A solid-milled block of 7-8 stars is mounted on them. Both Open-Glide and X-Dome are owned by SRAM.