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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 04-23-07, 11:50 PM   #1
TacoFighter3011
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Mechanical Question, Re:Drivetrain

I just built up an '83 Mercx pista and I'm having some trouble with the drivetrain.

Sometimes, when I go up a hill or need to push back to stop and I really need to push down hard on the pedal it slips-meaning, that it gives as if there was no resistance. Usually when this happens I end up falling on my face. It's happened twice so far and I'm just about to buy a different chain (I am using a Miche now), but figured I'd see if anyone could offer any advice before I ponyed up the twenty-five dollary-doos for a eco izumi.

I've checked the cog and that doesn't appear to be moving. The chain line is pretty straight. It is probably off being absolutely straight by a millimeter or so.

Also, I have a pair of C-Record pedals that I was using with this set-up, but the clip busted the second or third time I needed to stop. I only use a single laminated strap with these and would like to keep it this way. Does anyone have any advice on keeping these things from breaking when you need to stop?
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Old 04-24-07, 12:06 AM   #2
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your lockring and cog are loose it sounds like you cog is slipping and your hub maybe stripped as well
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Old 04-24-07, 12:11 AM   #3
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yeah its your chain its probibly streaching. some guys get that who have really massive legs. the only thing to do is get a nother drive side crank arm n chainring the same size as your existing chainring. put a nother same size cog on the other side of the hub n run a double. the equal pressure will equalize the pressure n allow you to ride nice and smooth. try it i promise itl work
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Old 04-24-07, 12:21 AM   #4
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Try removing the cog and lockring and check for stripped threads and make sure everything is wrenched down tight when you put it back together, like Retem said, sound like it needs some tightening. Just start poking around and see what you find.
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Old 04-24-07, 12:29 AM   #5
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oh btw I use the kmc z chain all chains stretch I can afford to replace mine every time it stretches that way I can buy 10 z chains for one izumi
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Old 04-24-07, 01:24 PM   #6
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Quote:
Originally Posted by thatcher
the only thing to do is get a nother drive side crank arm n chainring the same size as your existing chainring. put a nother same size cog on the other side of the hub n run a double.

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Old 04-24-07, 06:07 PM   #7
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i assume the chain tension has been good and the front ring doesn't look warn?
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Old 04-24-07, 06:36 PM   #8
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Retem's probably right; I don't know what the rest of these jokers are talking about.

What hubs are you running? What cog? What lockring? Who installed? Do you know what you're doing (no offense)?
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Old 04-24-07, 06:55 PM   #9
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Yes sounds like a loose cog and lockring. If it feels hand tight it still might be moving when you ride. The chain wouldn't skip and then just stay on; it would fall off.

Also, if I had to I could ride my fixie around town with platform pedals and no brakes and not have a problem unless some kind of unexpected/emergency situation arose. Now I'm not the same as everyone out there, but what I am saying is that if you are stripping hubs and breaking straps and you weren't about to crash or something then you may need to get more in sync with the bike too.

But yeah lean on that cog with a chainwhip and then lean on the lockring with a proper lockring tool. Doing it properly with the right tools works pretty well.
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Old 04-24-07, 11:27 PM   #10
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rotafix the cog and then tighten the **** outta the lockring or you might die
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Old 04-25-07, 12:09 PM   #11
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I love the double-up solution. I'm going to do it right now.
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Old 04-29-07, 01:39 PM   #12
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Thanks all for your advice.

Retem, thanks for your advice. It was the cog that was slipping. I ended up rotafixing it like you suggested and I havenít had any problems since. I had to buy a new cog. I was riding on the Miche splined-carrier set-up and that was what the problem was. I just took that off and put a regular cog on.

Igneous Faction, I donít know what Iím doing, but Iím slowly learning. No offense taken.

Thatcher, thanks. Choke on a cock you guzzler.
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