Until recently, the most common BMX sprocket size was 44 teeth. When paired with the most common tooth rear cog on a inch wheel, this causes a BMX bike to travel roughly 54 inches each time the pedals complete one full revolution.
Unfortunately, due to hub and brake mount limitations, not every BMX bike can accept every size option. The rear hub shells of BMX bikes typically have one of two thread sizes machined in the drive side--the side the chain attaches to--of the hub.
These threaded hub shells accept two different sizes of driver cogs. Some hubs--called flip-flop hubs--have both sets of threads on either side of the hub shell to allow for a greater diversity of possible gear combinations. Another style--called cassette hubs--builds the cog directly into a driver that attaches to the hub and allows for very small rear cogs.
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My nigga Enzo, stay up! Similarly, a smaller front sprocket lowers the gearing while a smaller rear sprocket makes gearing higher. The ring s in the front are individually called chain rings. Geared bicycles come with one, two or three rings notated as 1x, 2x and 3x and together the set of chain rings is called a crankset.
The smallest front sprockets you will find for any crankset will be around the mark. However, your largest rear cog 28 is really small by MTB standards. Even old 9-speeds go easily up to 34t in the rear, the current norm is 36 and can be extended to To increase low end power, you should increase size of rear sprocket or decrease size of front sprocket.
To increase top speed, you should reduce size of rear sprocket or increase size of front sprocket. When in doubt, use an easier gear: Being in a hard-to-pedal gear might seem faster, but it saps your strength quickly and can take a toll on your knees. Begin by counting the number of teeth on the largest front sprocket and largest rear.
These numbers are often printed right on the sprockets and cogs. Next, measure the distance between the middle of the crank bolt to the rear axle. This is also the chain stay length. Even somewhat narrower chain, typically. Multiply the front gear number by the rear gear number to get the number of speeds. For example, if you have two front gears and five back gears, you have a speed bike. If you have one front gear and three back gears, you have a 3-speed bike.
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