Technical & Reference Section > Tech and Restoration

chain ring to freewheel sizing ?

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BENDYCAT ELEVENTEEN:
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  ;)

oldschoolace:
15?  :-\

Jon The Bassist:
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.

BENDYCAT ELEVENTEEN:
so does a 14t fit on a normal hub or is it the double sided hub it needs ? ???

mattuknc:

--- Quote from: BENDYCAT ELEVENTEEN 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 ? ???

--- End quote ---
Yep, you'll need a flip flop hub or whatever they're called for a 14t.  :daumenhoch:

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