I am building (mostly theoretically at this point) a bike for this coming season. I am pretty set on going with a 42t single ring up front with a Paul chain keeper. I was curious if I can just use the same lever without running a shift cable? It is just a Tiagra, but it works and I would rather not have to buy anything extraneous nor do I care about "bling". I just want something solid, simple and reliable. I know Chris Mayhew runs a single ring set-up so chime in. Thanx, bruthas.