I've got an itch which I might scratch. I've always wanted a C40 and I've found one in good condition and the paintscheme I want OOF. I would really like to use my overtorque chain set with it. The C40 has an Italian bb. Can i use the thm Italian bb cups with my overtorque chainset?
I have my Colnago E1 with Italian BB working with an Overtorque chain set. It is not straightforward and Graeme on here is clearly the expert. But my experience may be helpful.
I could not find an Overtorque BB for an Italian Threaded BB (though Graeme assured me they were made at some point - just none left in stock.) You can still find English BB for Overtorque - but note that the width of the BB is 2mm greater in an Italian over and English. This was important in my setup. I found some Tune BB cups for a 30mm axle and used these but this does present 2 challenges:
1. There is no room for the 'adjustable' spacer in this set up
2. Given the lack of room behind the NDS crank arm, I had to modify the removal tool slightly to fit behind the crank arm.
Now the Tune BB bearing does not require any pre-load and the challenge is getting the correct spacing on the NDS Crank such that it seats correctly with no gap as per the 'screwdriver' test in the instructions - whilst also having no free play. Too many spacers and the cranks will bind and not enough and there will be free play. I bought a number of 30mm spacers of variety of thicknesses but settled wasn't 100% happy with the solution. So I used a 30mm wavy washer in the end and about 0.5 mm of spacers (from memory). This creates an amount of bearing pre-load but similar to a Ultra-Torque type set up which would be fine with the Tune bearings and no free play.
The other challenge is that this gives a slightly unequal Q between the cranks so I use a 1mm pedal washers on the NDS to equal it up - Not that I can feel it but it just gives a little bit more heel clearance when pedaling.
Because there is less space behind the NDS Crank I found the removal tool wouldn't quite fit behind the crank so I had to shave a bit off it to get it to slide in - doesn't really affect the tool - but it's the only way to get the crank arm off - so was required. With this slight modification it made the experimentation with the spacing much easier
I went with the Tune BB because they looked to be the thinnest I could find. There are a few alternatives as well and there have been other successful fittings of OverTorque and Italian BBs if you do some research on the WWW. I think it was Fairwheel Bike's Blog or similar that had some details of other successful OverTorque and Italian BB installations.
Good luck and the OT Cranks are great so well worth the effort IMHO.
Just let me know if you'd like any more information or photos...