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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 08-20-08, 02:25 PM   #1
Moribund
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Gear Ratios

I have been riding a converted Kona Lava Dome on a 32/12 ratio into work every day for a few weeks - the journey has one big hill to negotiate which is only just do-able. With an occasional full backpack this hill becomes nigh on impossible.

I was going to revert to a 13 rear sprocket, which I had used for 2 months or so (I am a relative newcomer). Then I had the bright idea of maybe using the big (44t) chain ring (instead of the middle chain ring) with say a 18t rear sprocket.

I am hoping this will give me the best of both worlds: the speed on the flat (better than a 32/12) and the ability to climb up that hill.

Have I got my maths wrong?
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Old 08-20-08, 02:30 PM   #2
ZiP0082
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this tool may help with your math:
http://software.bareknucklebrigade.c...it.applet.html

32x12 is 70.3 gear inches
32x13 is 64.9 gear inches
44x18 is 64.5 gear inches
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Old 08-20-08, 02:37 PM   #3
Moribund
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Cheers. So a 44/18 will basically give me the same performance as 32/13. I think I'm with it now.
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Old 08-20-08, 10:50 PM   #4
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note that your speed will not have "speed on the flat (better than a 32/12)" because your gear inch is lower = less distance covered per pedal rotation; since you're currently dying on the hill, though, the loss of your top speed on the flats is probably worth the ability to conquer your hill.
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Old 08-21-08, 12:46 AM   #5
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Quote:
Originally Posted by Moribund View Post
Cheers. So a 44/18 will basically give me the same performance as 32/13. I think I'm with it now.
??
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