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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 11-19-13, 02:59 PM   #1
IamBenRuiz
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Has anyone used Origin 8 ultim8 GXP Track Crankset?

Does anyone run this crank setup on their ride? I am having problems getting them to give proper chain line and am wondering if anyone had similar problems or a fix, maybe even pictures. I have found very little info on these cranks.

I posted in the Bicycle Mechanics thread. Here's the link: http://www.bikeforums.net/showthread...oper-chainline

Thanks
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Old 11-19-13, 04:20 PM   #2
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1st problem I see w/o reading the thread and just skimming the photos is the spacers. You don't need those whatsoever on what I assume is the run of the mill 68mm standard!
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Old 11-19-13, 04:37 PM   #3
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The only problem is if I remove those spacers then the bb will not sit flush against the bb shell. It would stick out about 4mm. And they are on the non drive side so I don't think that should be the problem.
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Old 11-19-13, 05:29 PM   #4
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Refer to Nagrom's answer in your other thread. Take out those spacers. You're not going to drop your chain unless you're an idiot
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Old 11-19-13, 06:31 PM   #5
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Originally Posted by IamBenRuiz View Post
The only problem is if I remove those spacers then the bb will not sit flush against the bb shell. It would stick out about 4mm. And they are on the non drive side so I don't think that should be the problem.
Your shell isn't 68mm?
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Old 11-19-13, 06:48 PM   #6
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It is 68mm. But the bottom bracket is made to fit 68 and 73. So in order to put it on I need the spacers.
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Old 11-19-13, 07:07 PM   #7
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Originally Posted by IamBenRuiz View Post
It is 68mm. But the bottom bracket is made to fit 68 and 73. So in order to put it on I need the spacers.
Get rid of the spacers and then measure your chain line.
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Old 11-19-13, 07:11 PM   #8
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It is 68mm. But the bottom bracket is made to fit 68 and 73. So in order to put it on I need the spacers.
For some reason, SRAM includes the instructions for GXP bottom brackets that are designed for mountain bikes with everything. You don't need or want spacers. If the spacers actually worked then this would be a sign that you were correct and that they provided you with the wrong bb. It is at least true of the SRAM s300 and omniums that the spacers should not be used. I would take out the spacers and see if that helps. It doesn't seem intuitive but it may actually bring the crank in somewhat because it doesn't look like your crank is tightened all the way down and you aren't able to with the spacers in there.

Another thing to note is that you might really have to tighten the bejeezus out of the crank. They sometimes seem like they are all the way down when they aren't. You may also want to loosen it up and try again if you feel like you aren't getting anywhere.

Last edited by prooftheory; 11-19-13 at 07:15 PM.
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Old 11-19-13, 07:14 PM   #9
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The only problem is if I remove those spacers then the bb will not sit flush against the bb shell. It would stick out about 4mm.
Have you actually tried this, or are you just guessing?

And if you have, and you actually can't thread the cup all the way in, WHY can't you tighten the cup all the way in? Are the threads in the shell ok?
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Old 11-20-13, 09:22 AM   #10
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External bearing cups(such as GXP interface) require a highly specific distance between the cups in order to work with the cranks. The spacers are necessary in order to achieve this distance. A 73 shell would simply require less spacers. He has all the spacers on the non-drive side anyway, so removing them wouldn't change the chainline. OP get some new cranks or adjust the rear chainline if possible. BTW have you tried sighting down the chainring with the rear cog installed? 8mm off sounds excessive.
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Old 11-20-13, 01:10 PM   #11
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The amount of misinformation people toss around on the internet regarding GXP BBs and spacers is unbelievable.
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