Originally Posted by
twocicle
Throw me a bone... what did you end up sourcing for the 42t on this crank?
You can use a TA Tripleizer 42 tooth chainring. I tried it out as an exercise at work with the regular Ultegra triple 6703 single bike cranks, and it was entirely compatible, although I did not mount it on a bike. Using that, you could then change the inner ring to a 28 (or even 26). The TA is not as stiff and probably won't shift quite as well as the Ultegra, but if you want these cranks and still want chainring options then it is your only option.