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Old 11-21-05, 04:57 PM   #1
NZ_Rida
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Gearing question

Hello.
i've got a gearing question (my dirt jump bike, Giant Rhythym) has currently got 39 x 14T gearing on it and i was thinking of changing it because its sucks!!! i need a better gearign combo for street/dirt becuase at the moment my gearing dosen't accelerate that well and I would like better acelleration for the riding i do. the current gearing makes the bike feel slow and slugish which isn't that great.
thanks,
Dan
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Old 11-21-05, 04:59 PM   #2
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when you say "dirt jump bike" is that implying you have more then one bmx or more then one bike...
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Old 11-21-05, 05:01 PM   #3
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I only have one BMX
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Old 11-21-05, 05:03 PM   #4
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Gearing won't make your bike feel sluggish, you're just weak. 39x14 sounds like you're spinning too much and not going anywhere. Do you have a cassette hub?
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Old 11-21-05, 05:04 PM   #5
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if you go to www.danscomp.com you can click links to find a gearing chart where you put the number for the chainwheel and for the freewheel/cog and it'll tell you what that ratios good for.
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Old 11-21-05, 05:13 PM   #6
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get a 25t, you will accelerate really good
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Old 11-21-05, 05:18 PM   #7
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Originally Posted by queensrider86
get a 25t, you will accelerate really good
Yeah, if he's got 36" tires, that would be great.
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Old 11-21-05, 05:28 PM   #8
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39/14 is a pretty standard BMX ratio.
For every crank revolution, your back tires revolves 2.78x.

I'm curious as to what kind of dirt jumping you do, that requires a lower gear ratio than that.
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Old 11-21-05, 05:43 PM   #9
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Probably the kind where he's not pedalling hard enough and is trying to blame it on the gearing.
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Old 11-21-05, 06:00 PM   #10
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just get a 25t, it accelerates way better. ask anybody
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Old 11-21-05, 06:24 PM   #11
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just get a 25t, it accelerates way better. ask anybody
No dude don't get a 25T sprocket, that won't help you.

Get a 23T
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Old 11-22-05, 02:15 PM   #12
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No dude don't get a 25T sprocket, that won't help you.

Get a 23T
HAHA.
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Old 11-23-05, 11:20 AM   #13
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you have to remember to get a bigger freewheel too.

23/18 will answer all your accelerating dreams.
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Old 11-23-05, 11:38 AM   #14
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you have to remember to get a bigger freewheel too.

23/18 will answer all your accelerating dreams.
Yeh that should work, should be really good for dirt.
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Old 11-23-05, 11:42 AM   #15
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Originally Posted by racersk66
Yeh that should work, should be really good for dirt.

what do you mean should??, itll definatley work, we're talkin about a 1.27 ratio, theres nothing better.
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Old 11-23-05, 12:06 PM   #16
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what do you mean should??, itll definatley work, we're talkin about a 1.27 ratio, theres nothing better.
HAHA
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Old 11-24-05, 08:02 AM   #17
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if you dont care about size...then go with something like a 41-15...but it will take strenght

but 39-14 is one of the standard ratios for bmx gearing

but the others are

44-16, 41-15, 39-14, 36-13, 33-12, 30-11, 28-10, 25-9, and if you have the new primo hub you could buy there 8t driver and a 23t chain wheel for a 23-8

but i wouldnt go any smaller then 30-11...becuase the smaller the chainwheel the more pressure and wear you get faster....
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