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cogs, chains, and chainrings... are they neccessary?

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)

cogs, chains, and chainrings... are they neccessary?

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Old 06-23-05, 06:04 PM
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chzman
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cogs, chains, and chainrings... are they neccessary?

Ok so I couldn't come up with a good thread title, but I do have a valid question. What is the optimal chainring/cog combo for maximum longevity/wear (around 77-83 gear inches)?

Since it is taking forever to get my frame, I have began to second guess my choice of gearing (49/16). Any suggestions or favorties, for a gear inch around 77-83 that will wear the longest? Maybe this isn't even an issue because it won't be that significant in differences.
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Old 06-23-05, 06:27 PM
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Odd and even (or even and odd) is good for chain wear.

49/16 is pretty steep.
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Old 06-23-05, 06:38 PM
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That's a nice gear unless you're doing long climbs. Will let you really fly on the flats but still manage light inclines at a decent cadence. Try it out for a while.
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Old 06-23-05, 07:33 PM
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196/64 isn't like to wear out anytime soon. watch those chainstays
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Old 06-23-05, 07:50 PM
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I just had a great mental image of a bike where the gears were so big that you didn't need a chain at all... That would be cool.
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Old 06-23-05, 08:14 PM
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In general, the more teeth, the longer it'll last. If longevity is a concern, look for steel chainrings and cogs as well. Most cogs are steel, but most cheap chainrings are aluminum, which will wear out faster than steel. Surly makes a stainless steel chainring, I believe, and perhaps a few other folks.

I've got templates for making up to 94t chainrings with a drill press, if anyone is interested.

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Old 06-23-05, 08:57 PM
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52 is feeling a bit to small, what's the diameter (inches) of said chain ring?
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Old 06-23-05, 09:02 PM
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Originally Posted by HereNT
I just had a great mental image of a bike where the gears were so big that you didn't need a chain at all... That would be cool.
Depends if you like going backwards all the time
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Old 06-23-05, 09:02 PM
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i think i'll go 195/64. gotta keep that odd/even thing going.
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Old 06-23-05, 09:03 PM
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Originally Posted by _iv
Depends if you like going backwards all the time
or pedal backwards all the time
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Old 06-23-05, 09:19 PM
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I wish I could pedal backwards

Okay, gotta go get liquored up know. Bye Bye.
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Old 06-23-05, 09:22 PM
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Pedaling backwards is the key to time travel.
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Old 06-23-05, 09:32 PM
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Originally Posted by dustinlikewhat
52 is feeling a bit to small, what's the diameter (inches) of said chain ring?
Diameter of a chainring = (number of teeth / 2) / pi

92t = about 14.5 inches in diameter. Big mofo.

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Old 06-23-05, 09:37 PM
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92 x 13 should be a good ratio....
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Old 06-23-05, 10:09 PM
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92/13, eh? Thats only 189 gear inches. I mean, you can push that, right?

Actually, Ritchey sells a 33t cassette sprocket for custom cassettes. Its on sale right now for like 4$ from nashbar. If you fix a freehub you could use spacers and that sprocket with a 92t chainring and get a pleasant 74 gear inches.

Of course, Your chainring would stick out about 10mm from each side of your crank. Thats not too bad though, you'd just have to be REAAALY careful about your pant legs. And you'd probably have to spend some time with a ball peen hammer on your chainstay to get the 3" of additional chainring clearance you'd need. Of course, you could mount on the outside of the spider since you'd be using a fixed freehub and could use spacers to bring your chainline way out to the side. You could even space out the chainring until it ran into the crank if you wanted. You might be able to avoid any frame adjustment in that case.

I DARE someone to do it. No, I DOUBLE DOG DARE someone.

http://www.ihpva.org/Builders/Sprocket/

peace,
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Old 06-23-05, 10:18 PM
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can't say no to the double dog dare, or you might as well wear a dress
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Old 06-23-05, 10:34 PM
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what's the optimal gearing for complete knee replacement? aren't you planning on doing centuries on this bike?

and i still have to build your wheels before anything happens. mwah ha ha.
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Old 06-23-05, 10:37 PM
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double centuries to be exact.

And a wheel set would be nice, but i have no frame either. those things might be essential.
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Old 06-23-05, 10:40 PM
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Just think, with 92/11 you'd be pushing 223 gear inches. That means every time I make three strokes, you only need to make one! Think how nice that will be on the century. Everyone will be pedalling like crazy, and you'll just be gliding along at a comfortable cadence. Of course, you'll need to be the Hulk.

But think how much fun it would be to go 53 miles per hour at a comfortable 80rpm. You know you want it.

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Old 06-23-05, 10:44 PM
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so while im ordering a variety of steroids, hgh, and clothes that easily rip off my body, might as well cut me that 92t ring.
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Old 06-23-05, 10:47 PM
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this ring should come with a water bottle full of pcp.
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Old 06-24-05, 08:01 AM
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I'd like to put some big gears on my unicycle.
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Old 06-24-05, 11:03 AM
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Why do you choose to go big in the front and back? Just go small on both what about 41/14? The chain will flex less.

That is of course the smallest chainring for 144 BCD. You could go smaller depending on ur cranks. 33/11.
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Old 06-24-05, 11:56 AM
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That was what I was thinking about. The cranks are Sugino75's, so I do think the bcd is 144.
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Old 06-24-05, 02:05 PM
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I'm pretty sure I read this in an article by Matt Chester.

I think that going with bigger front/rear is the way to go to prevent chain wear. And, I'd bet that it works to prevent cog and chainring wear too. With bigger cogs/rings, the chain doesn't bend as drastically around them. Plus, with more teeth being engaged around the cog and ring, there is less chance of chain slip if your tension is off. Just my $.02.
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