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BMX Dirt, vert, flatland or street? Drop in the BMX forum to talk to other 20" riders around the world. What is the best BMX bicycle for you? Learn all about it here.

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Old 08-14-05, 12:32 PM   #1
Haro4life2
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chain ring

what is the best size chain ring for bmx if i am riding skate parks and vert?? are smaller ones better
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Old 08-14-05, 01:08 PM   #2
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Smaller sprockets are nice 'cause they stay up out of the way, they're lighter and slightly stiffer (harder to bend). Remember though, if you switch to a tiny little 28t sprocket in the front and don't change the rear as well, you've got a bike that pedals really fast and goes really slow. Average gear ratio for BMX, that is, the number of teeth on the front sprocket divided by number of teeth on the rear cog/freewheel is typically about 2.75:1 or so.
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Old 08-15-05, 02:08 AM   #3
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so what do i need for the back
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Old 08-15-05, 04:31 AM   #4
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so would a 28t on the front be ok with a 10t on the back???

I dont understand ratios!
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Old 08-15-05, 07:02 AM   #5
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the ratios are designed to keep the smaller drivetrain craze felling just like a regular 44-16 ratio that comes on most older stock and K-Mart bikes.


the ratios are set up so you get the same distanse, top speed, and acceleration as a 44-16...


they are: 44-16, 41-15, 39-14, 36-13, 33-12, 30-11, 28-10, and 25-9.



i also heard that some companys were making like a 23T or 24T sprocket...is this true?
cause i didnt think it was possible since a 25T sprocket barley reaches the chainwheel bolt on the crank arm...
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Old 08-15-05, 12:36 PM   #6
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so would a 28-10 keep my speed aswel as been out of the way
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Old 08-15-05, 09:42 PM   #7
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Quote:
Originally Posted by Haro4life2
so would a 28-10 keep my speed aswel as been out of the way
I already explained how to get the ratio. Read my reply and use a calculator. Front sprocket divided by rear cog. Smaller numbers are easier gears to push, bigger numbers are harder gears and the norm is right around 2.75.
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Old 08-16-05, 12:52 AM   #8
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Im not normal :-(, 2.79:1.
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