Join Date: Oct 2004
Location: DC / Maryland suburbs
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Originally Posted by yyoussef
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
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
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.