Founded in 1996, China Xiqiang Pumps Co., Ltd. is professional bicycle gear manufacturer and wholesaler for the household, industrial and agricultural industries. With 80% components home made, quality is better controlled here. GS, CE, UL, EMC & EMF certificates guarantee received products to be high quality for customers. We have become the long-term custom bicycle gears supplier of world-class retailers such as B&Q, BAUHAUS, OBI, METRO, etc.

Elite Crono Hydromag.
As with the Mag Elastogel, this is the smoothest and quietest trainer on the market. In this unit road conditions are duplicated because the Crono frame takes into account the riders weight, so the power exerted is relative to the riders weight and speed in road riding, something not attainable in normal trainers. Adjustment is achieved with the magnetic resistance unit in addition to the bicycle gear system.
For example, a normal bicycle has wheels that are 26 inches in diameter. The "lowest" gear ratio on the bike might be a front chain wheel with 22 teeth and a rear gear having 30 teeth. That means that the gear ratio is 0.73-to-1. For each pedal stroke, the rear wheel turns 0.73 times. In other words, for each pedal stroke, the bike moves forward about 60 inches (about 3.4 mph / 5.4 kph at a 60-rpm pedaling rate). The "highest" gear ratio on the bike might be a front chain wheel with 44 teeth and a rear gear having 11 teeth. That creates a 4-to-1 gear ratio. With 26-inch wheels, the bike moves forward 326 inches with each pedal stroke. At a 60-rpm pedaling rate, the speed of the bike is 18.5 mph (30 kph). By doubling the pedaling rate to 120 rpm, the bike has a maximum speed of 37 mph (60 kph). A range of 3.4 mph to 37 mph is fantastic, and it lets the rider climb the steepest hill very slowly or race almost as fast as a car! That is why a bike has gears.

Minoura MAG-500R.
The same as the 500D, but with the addition of a remote shifter for those wishing to adjust the load "on the go". Great for a beginner or a budget trainer. 500 gram steel flywheel works the same as the MAG-500's big brother, the MAG-850. Wide and stable legs welded to a steel frame provide a stable base. The MAG-500 allows the use of a 24" wheel without the use of an adaptor. 5-year limited warranty on both the frame and Mag unit.
The idea behind multiple gears on a bicycle -- whether it's an older "10-speed" bike or a modern mountain bike with 24 gears -- is to let you change the distance that the bike moves forward with each pedal stroke.
The freewheel has between five and nine gears on it, depending on the bike. A freewheel spins freely in one direction and locks in the other. That allows the rider to either pedal or not pedal -- when not pedaling, the bike coasts (another feature that tricycles and penny-farthing bicycles lack).
The rear derailleur has two small cogs on it that both spin freely. The purpose of the arm and lower cog of the derailleur is to tension the chain. The cog and arm are connected to a spring so that the cog pulls backward at all times. As you change gears, you will notice that the angle of the arm changes to take up or let out slack.

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