Micro spline is a new type of tower foundation, which adopts 23 grooves, but its size is much smaller. At present, only XTRM91001and 12 speed flywheels are supported.
What is a flywheel?
Flywheels come in various sizes and are suitable for all types of bicycles. The size of a flywheel is usually represented by its smallest and largest gear pieces. For example, the typical modern highway flywheel is 1 1-32 T flywheel, and the range of mountain bike flywheel may be 10-52 t ... Although the flywheel looks simple, there is a lot of design knowledge in the bicycle flywheel. Box flywheel is not only a set of gears, but also can work together as a whole. Each flywheel blade is accurately positioned relative to each other to ensure the chain moves smoothly between gears. The teeth on the flywheel disc have different shapes, and grooves are usually designed on the side, which is helpful to ensure the smooth shift between gears. With the development of technology, the design of these grooves is gradually improved. For example, Shimano uses a system called Hyperglide, which aims to provide smooth gear shifting. Its latest flywheel adopts Hyperglide+ system. Shimano said that compared with Hyperglide, this system shortens the shift time by one third and improves the shift performance under the pedal. Other flywheel suppliers, such as SRAM and Campagnolo, have the same perfect design. Because it is designed as a whole system and not sold separately, the replacement cost is relatively high, because it can only be replaced as a whole.