SAME GEAR RATIO WITH A SMALLER RING?
Hi Lee,
I just got a Black Market MOB and want to run a gear ratio (single speed) as close to 36-17 as I can, but with a smaller front and rear sprocket. Can you tell me how to compute this or just tell me what the closest is?
Justin
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Hey Justin,
Chainring / cog = ratio
36 / 17 = 2.12
—- —- —-
Chainring / ratio = cog
Say you want to run a 32 up front.
32 / 2.12 = 15.1
—- —- —-
You can rock a 32×15.
Braaap!
5 Comments
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Justin Brown Says June 7, 2007 @ 8:19 am
Thanks…as usual, you are the man.
Miles Says June 7, 2007 @ 1:17 pm
Lee Like Math
leelikesbikes Says June 7, 2007 @ 4:36 pm
I love math—up to trigonometry … that’s when I knew I’d be a writer …
nathan Says June 9, 2007 @ 6:05 pm
oh noes 17 is prime!
Jeff Kendall-Weed Says June 11, 2007 @ 7:06 pm
A lot of BMX kids love their 25-9 set ups. I’ve never ridden it, but in theory you could go all the way down to 24/11. That would be a 2.18 ratio, quite close to your current setup.
The advantages to doing this would be more clearance and less drivetrain weight. The disadvantages would be that such small gears would wear out a bit faster, as the same amount of force from a 36 tooth sprocket, with roughly 18 teeth distributing the load, would be applied to a 24 teeth, with only 12 teeth on the chain. Anyhow, give it a shot if you want.