What are the sprocket sizes on a mountain bike (front and back)?
i want to know the sizes of the sprockets on most mountain bikes because i am trying to put them on my bmx bike. only if i can get them off.
The front rings probably won’t work for you…..most mountain bike chainrings have a 4-bolt pattern and unless you have one of the few bmx racing cranks that will take it, you’re out of luck. The common tooth patterns that come stock on most bikes are 22, 32, and 44 but there are all kinds out there.
For the rear, the cassettes are made up of 8 or 9 cogs usually (fewer, on the cheaper department store bikes), and range from 11 to 34 teeth. 11-34 cassettes are by far the most popular, but 11-32 is common, too. Only the smallest 4 cogs are separate….the others are held together as one unit. Sram cassettes have teeny screws that you can undo to separate the cogs, but Shimano rivets theirs (but they can be driven out carefully with a punch, or drilled). The popular cogs would be 11, 13, 15, 17, 20, 23, 26, 30, 34.
I’m not sure how you’d get the rear cogs onto a bmx bike unless you built a rear wheel with the right hub…..they’re all splined to fit Shimano cassette bodies and wouldn’t fit onto any bmx drivers that I’m aware of.
Hope this helps a little.
Mountain Bike Suspension Parts & Maintenance : Set Front Sag for Mountain Bikes