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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  chain ring to freewheel sizing ?
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Author Topic: chain ring to freewheel sizing ?  (Read 538 times)

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Offline BENDYCAT ELEVENTEEN

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chain ring to freewheel sizing ?
« on: September 03, 2012, 02:19 PM »
A 39 tooth chain ring - what size freewheel ?

i know you can have a fast start feel or  more pace with a bigger size

just wondered what size do what ?

cheers B  ;)
The Devil is away on business, I'm having to step in for him - How can I make your day Hell !!!

Offline oldschoolace

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Re: chain ring to freewheel sizing ?
« Reply #1 on: September 03, 2012, 02:21 PM »
15?  :-\
Sixteen thirty-two. What is that? A year?   No, it's your top score on Pole Position.


Offline Jon The Bassist

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Re: chain ring to freewheel sizing ?
« Reply #2 on: September 03, 2012, 02:37 PM »
On a 20" BMX you want a chainring to freewheel ratio of about 2.75, eg 44/16, 39/14 etc.
Anything that makes the ratio bigger gives more top speed.
Anything that makes the ratio smaller gives more acceleration.

Offline BENDYCAT ELEVENTEEN

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Re: chain ring to freewheel sizing ?
« Reply #3 on: September 03, 2012, 03:02 PM »
so does a 14t fit on a normal hub or is it the double sided hub it needs ? ???
The Devil is away on business, I'm having to step in for him - How can I make your day Hell !!!

mattuknc

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Re: chain ring to freewheel sizing ?
« Reply #4 on: September 03, 2012, 03:11 PM »
so does a 14t fit on a normal hub or is it the double sided hub it needs ? ???
Yep, you'll need a flip flop hub or whatever they're called for a 14t.  :daumenhoch:

Offline Spen69

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Re: chain ring to freewheel sizing ?
« Reply #5 on: September 04, 2012, 11:13 AM »
Yep, you need a flip-flop hub.

I run an Odyssey 13T freewheel on my Badlander as it's the smallest you can get for a 30mm metric side on a flip-flop which let's me run a 36T chainring on a 110mm BCD powerdisc. Any smaller will clip the chain and you will need a small 110mm BCD spider to avoid this which wasn't an option on a park bike.
Still limping......

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  chain ring to freewheel sizing ?
 

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