BMX - Gearing question
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NZ_Rida
11-21-05, 04:57 PM
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
when you say "dirt jump bike" is that implying you have more then one bmx or more then one bike...
NZ_Rida
11-21-05, 05:01 PM
I only have one BMX
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?
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.
queensrider86
11-21-05, 05:13 PM
get a 25t, you will accelerate really good
get a 25t, you will accelerate really good
Yeah, if he's got 36" tires, that would be great.
lyledriver
11-21-05, 05:28 PM
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.
CMcMahon
11-21-05, 05:43 PM
Probably the kind where he's not pedalling hard enough and is trying to blame it on the gearing.
queensrider86
11-21-05, 06:00 PM
just get a 25t, it accelerates way better. ask anybody
bmichaelx
11-21-05, 06:24 PM
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
racersk66
11-22-05, 02:15 PM
No dude don't get a 25T sprocket, that won't help you.
Get a 23T
HAHA.
I_Suck_At_BMX
11-23-05, 11:20 AM
you have to remember to get a bigger freewheel too.
23/18 will answer all your accelerating dreams.
racersk66
11-23-05, 11:38 AM
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.
I_Suck_At_BMX
11-23-05, 11:42 AM
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.
racersk66
11-23-05, 12:06 PM
what do you mean should??, itll definatley work, we're talkin about a 1.27 ratio, theres nothing better.
HAHA
KinetikBiker
11-24-05, 08:02 AM
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....