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Old 08-03-07, 11:00 AM   #1
yyoussef
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Bottom Bracket advice

Hello,
The bottom bracket in my Cannondale Cyclocross is starting to make creaking sounds. It is TruVatiV Giga X Pipe. I would like to replace the bearings with ceremic bearings.
1) Any advice if I should try to replace only the bearings, which means I have to figure how to open the seal. If yes, recomendation of tools.
2) If I should replace the bottom bracket, do I need to worry about size, or are all the bottom brackets the same size.
3) Any advise on reasonably priced brand

Thanks,
Youssef
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Old 08-03-07, 11:12 AM   #2
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Originally Posted by yyoussef View Post
Hello,
The bottom bracket in my Cannondale Cyclocross is starting to make creaking sounds. It is TruVatiV Giga X Pipe. I would like to replace the bearings with ceremic bearings.
1) Any advice if I should try to replace only the bearings, which means I have to figure how to open the seal. If yes, recomendation of tools.
2) If I should replace the bottom bracket, do I need to worry about size, or are all the bottom brackets the same size.
3) Any advise on reasonably priced brand

Thanks,
Youssef
First of all, ceramic bearings don't make much sense. They shave a tiny amount of total weight, add a LOT to the cost, and a debatable amount of durability. In my opinion they are simply a fad, mostly being pushed by FSA it seems (read this or this for some of the details on ceramic bearings BS).

Now on to the other questions You should check out the manufacturer's site for more info on your BB: http://www.sram.com/en/truvativ/bott...upsenglish.php

1) Yours is an outboard-bearing design, rather than a cartridge BB, so it should be possible to replace the bearings only. However, they are sealed cartridge bearings, *not* loose balls. Basically, the bearing comes in a cartridge that looks something like this:

This is a well-sealed design compared to loose bearing balls, but when it wears out you need to replace the whole cartridge.

2) Bottom brackets come in a wide variety of diameters/threadings (yours is English-threaded, 68mm), a wide variety of spindle lengths, and a wide variety of crank-spindle interfaces (in your case yours is an outboard-bearing design with the spindle integrated into the crank). However, you can pretty much ignore all that since you only need to replace the bearings

3) You only need to replace the bearings. You'll have to find out exactly what size the cartridges are, which I couldn't figure out from Truvativ's web site unfortunately. A shop can probably help you out with this and replace the bearings for $10-30 + labor. On the other hand, they are probably standard industrial bearing cartridges, and if you can figure out the right part yourself, you can get them for $5-10 likely.

Last edited by moxfyre; 08-03-07 at 11:24 AM.
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Old 08-06-07, 12:30 PM   #3
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How..?

Thanks for the info. It is greatly appreciated.
Just wondering how did you figure the size 68mm
I checked http://www.sram.com/_media/techdocs/...aPipe-e-r2.pdf What in the chart indicated the one in my bike?

Just trying to learn reading this stuff..

Cheers,
Youssef
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Old 08-06-07, 02:33 PM   #4
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Nothing in that chart. He probably looked it up on the Cannondale site, something you could do yourself.
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Old 08-06-07, 06:54 PM   #5
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enduro

Quote:
Originally Posted by yyoussef View Post
1) Any advice if I should try to replace only the bearings, which means I have to figure how to open the seal. If yes, recomendation of tools.
Enduro use to press the bearings in for free if you sent them your cups, I'm not sure if they still do?
Call them and ask. (877) ENDURO-1

http://www.enduroforkseals.com/id101.html

DIY:

http://www.enduroforkseals.com/siteb...p_by_rwc_f.pdf
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Old 08-13-07, 02:21 PM   #6
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Thanks for the pointer.

Cheers,
Youssef
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Old 08-20-07, 07:32 AM   #7
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don't forget to get the bottom bracket faced.
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