Some time ago, we introduced the application of 1x single disk system in various models. So what are the advantages and disadvantages of 1x single disk system? Should I use a 1x single disk, a 2x dual disk, or even a 3x three disk system? Can I change it to a 1x single disk system by myself? That article will answer you one by one. What are the advantages of
1X transmission?
0 simple. The 1x drivetrain is easier to operate than a drivetrain with multiple discs, without taking into account the front shifting. There are usually many repetitive gears on 2x and 3x settings that have the same gear ratio, and the 1x drivetrain can also eliminate these burdens. For example, there are three sets of repeat gear options on the 2x settings using 50/34 discs and 11-28 flywheels. For novices, single disks are free from the trouble of wear and tear of the gear chain due to improper operation, and single disks are also more convenient for changing the crankset.
reduces weight. The 1x drivetrain is usually lighter than the 2x or 3x drivetrain because it abandons the excess discs, front transmission and corresponding tubes. However, if a clutch-equipped rear derailleur is used, the weight of the assembly will almost increase compared to a non-clutch rear derailleur. If replaced with a wider range of flywheels, it will also add weight compared to the more compact flywheels in the 2x setup.
is easy to maintain. The 1x drivetrain is easy to maintain, mainly because there is only one transmission that needs to be adjusted and maintained in operation. There is no need to worry about installing or maintaining the front transmission, and it is easy to install it back if the link is dropped. Cleaning is also easier, with the front derailleur usually a dirt collector, and cleaning a single platter is much easier than erasing dirt from the gap between multiple platters.
2x and 3x drivetrains limit what frame designers can do, as they need to consider the mounting points of the front transmission of the frame, as well as the crankset that houses multiple discs. If
uses 1X transmission, manufacturers can adjust the seat tube design without installing a transmission mount and other platters to increase tire clearance, frame rigidity or compliance. 1x allows for shorter chain lengths as the chain does not interfere with the rear tires. Shorter chain lengths create more flexibility, and for rear shock absorber mountain bike , a more complex suspension design can be run without the front transmission mount.
cost. Because they have fewer components, the cost of a 1x drivetrain tends to be less than an equivalent 2x drivetrain. For example, the Shimano GRX 810 1x has an MSRP of £999, while the equivalent GRX 810 2x component is £1049. The SRAM Red eTap AXS 2x group retails for £2423, and choosing the 1X setting will reduce the price to £1978. What are the disadvantages of the
1x transmission system?
0 The gear span is large. Typically, the 1x drivetrain has half the number of gears that are the 2x drivetrain, but they still need to achieve the same gear range to help riders overcome hill climbs and high-speed roads. To solve this problem, most 1x drivetrains have a wide range of flywheels. For example, the SRAM Eagle has 10-52 flywheels, and the Shimano 's mountain bike assembly has 10-51 flywheels.
These drivetrains have more than 500% gear range, but this is still not as large as some 2x drivetrains. This means choosing the correct disc size and flywheel ratio is key to achieving the gear range required for riding. However, even if the gear range is sufficient, it may be possible to find that the jump between the gears is large, disrupting the rhythm and pedal stroke. This isn't a big problem on off-road sections, but if you're on the road or riding with a bunch of people, it's not possible to choose the right gear, and keeping the same rhythm as others can be a bit troublesome.
chain angle and efficiency. Admittedly, the chain runs at a more extreme angle on the 1x setup than the 2x drivetrain.
The more extreme chain angles you experience when you are at the smallest or largest gear can cause the 1x drivetrain to be less efficient than the dual-disk drivetrain. The 1x drivetrain also tends to run the chain at higher speeds and higher tensions, which can also lead to greater friction and lower efficiency. Research shows that the average friction force of the 1X transmission system is 12.24 watts and the average friction force of the 2X transmission system is 9.45 watts.For real performance maniacs, this difference may be enough to get them to turn to the 2x drivetrain.
component life. Due to the extremely large chain angle, it may be necessary to replace the discs more frequently, but this depends largely on component selection. Narrow wide discs designed for 1x drivetrains will have a higher tooth shape and be wider than other discs, so they will be relatively durable. In any case, once the chain reaches the wear limit, you need to replace the chain, and if you don't, you may also need to replace the flywheel, which is usually more expensive.
requires a specific base. Since many 1x drivetrains use smaller start gears to create gear ranges closer to the 2x and 3x drivetrains, brands have had to create new tower bases to fit them. The tower foundation standards before
are highly compatible. With 1x, the tower foundation specifications of each company are different, so it will be relatively troublesome to upgrade the wheelset in the future.
Should I choose 1x or 2x drivetrain?
The best choice will depend on the individual's riding requirements and cycling terrain. If you prefer simplicity, lightweight, reduce maintenance and improve chain retention, the 1x drivetrain is a great option. If you want a better ride rhythm, then the 2x drivetrain may be more suitable. For mountainous off-road riding, the advantages of the 1x drivetrain outweigh the disadvantages.
can I change it to the 1X system by myself? It is relatively easy to replace
with 1X system by itself, but it is recommended to use positive and negative teeth discs, as well as with clutch mechanism and to prevent chain loss. Of course, if you can buy the whole set, it is the most suitable.
Related reading: Why do road cars rarely use single disks? 1x Analysis of the use of various types of vehicles
Edit: Bin
