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 Post subject: 2:1 ratios
PostPosted: Sat Nov 20, 2010 1:31 am 
Gold Trader
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Joined: Mon Mar 22, 2010 10:17 am
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Location: Mid Suffolk
Is pedalling a 32:16 the same as a 22:11 ??


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 Post subject:
PostPosted: Sat Nov 20, 2010 1:36 am 
North Wales AEC / OWMTBC 2010 Champion
North Wales AEC / OWMTBC 2010 Champion
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Joined: Sun May 11, 2008 10:13 pm
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yes, the former is preferred as more teeth distribute the loads better.


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PostPosted: Sat Nov 20, 2010 1:38 am 
Gold Trader
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Cool..

Dunno why I struggle to get my head around ratio's and stuff...

Is there a downside to running smaller rings?


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PostPosted: Sat Nov 20, 2010 5:30 am 
BoTM Winner / Gold Trader
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Like easy said. Bigger gears distribute the torque over more teeth. You have about half the teeth in contact on the cogs on a SS. on 22-11 the torque will be distributed over 5 teeth in the rear as opposed to 8 in 32-16.


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PostPosted: Sat Nov 20, 2010 6:36 am 
retrobike rider
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The only advantage of running different size cogs that are the same ratio, would be if they allow you to run a magic ratio without any tensioners.


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 Post subject:
PostPosted: Sat Nov 20, 2010 6:39 am 
retrobike rider / Gold Trader
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...And reduce weight slightly and increase chainring clearance when going over logs etc.


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 Post subject:
PostPosted: Sat Nov 20, 2010 9:02 am 
Anglian Deputy AEC
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If you ran 22:11 your chain would run very close to the chainstay. You will have really bad chain slap unless you chain is very tight. Most singlespeed MTB's run 32:16 for a very good reason, it works.


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 Post subject:
PostPosted: Sat Nov 20, 2010 9:27 am 
Gold Trader / PoTM Winner / RB Rider
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Plus running even numbers is better for wear, according to sheldon


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 Post subject:
PostPosted: Sat Nov 20, 2010 6:03 pm 
Retro Guru
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Don't think so - gears with no common factors are better, for example 46/15, 32/17. Number of chain links also comes into it. It all gets very geeky very quickly...

I used to ride 46/15 on my fixed-wheel on the road, and it was bang on IMHO. I'm going to try out 32/17 on my singlespeed MTB but it will only be for very steep stuff and because I think it's magic for the frame...


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PostPosted: Sat Nov 20, 2010 6:05 pm 
Gold Trader
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Thanks all..

Was just trawling ebay for cranks and it may be easier for me to get a trials crank than wait for the 94bcd black shiny ones I need..
And they come with 22T rings which I'd have to run with for a while..

Or maybe BMX ones.. but that's another thread :lol:


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