My bike uses the FSA Megatech Integrated BB, circa 2003. The design uses an OS BB shell with pressed-in bearings (no threaded adapters), carrying an ISIS spindle. The bearings are 27x43x8mm, (SS and 2-RS). The original bearings were marked "THI", which is the Taiwan company that makes and markets the FSA brand.
The design was promoted as an "open standard" for the industry to use. FSA had the drawings and tolerances on the web, and offered the cutting tools to finish and face the BB shell to exact dimensions. In addition to bigger bearings for the ISIS spindle, the OS shell allows more weld area for the frame tubes. The "open" design failed to catch with any major manufacturer then, but now it seems Trek and Cdale are now offering their own proprietary versions.
About 4 years ago, the LBS ordered replacements from FSA, but contact with their tech support recently only got me the "FSA no longer supports this product".
Have looked at online bearing houses with no luck so far; the size seems to be a weird one. Any help to point me to a source would be greatly appreciated.
The design was promoted as an "open standard" for the industry to use. FSA had the drawings and tolerances on the web, and offered the cutting tools to finish and face the BB shell to exact dimensions. In addition to bigger bearings for the ISIS spindle, the OS shell allows more weld area for the frame tubes. The "open" design failed to catch with any major manufacturer then, but now it seems Trek and Cdale are now offering their own proprietary versions.
About 4 years ago, the LBS ordered replacements from FSA, but contact with their tech support recently only got me the "FSA no longer supports this product".
Have looked at online bearing houses with no luck so far; the size seems to be a weird one. Any help to point me to a source would be greatly appreciated.