weird, i can't find the email i sent to RJC . . . hmm.
anyway, i may have found the answer here:-
specifically Andy R's post down the page
viewtopic.php?t=91813
some of you may know i am having a bike built (again) last piece of the puzzle is the cranks and BB.
i want middleburn and i am using an alfine rear end, but i have never used a singlespeed/ring/alfine set up before so i am unfamiliar with the issues of chainline of this type of set up. it seemed like every time i looked into it people had different recommendations, the internet made it worse frankly!
i wanted RS7 cranks (square taper) as i prefer the look as they don't have the weird looking tension part on them that the external set does, then i had questions of the best set up, uno ring or spider and ring, and which one gave the correct chainline and did i need to differ from the recommended 113mm BB axle length. no one seemed to offer an answer from middleburn or activesport (i'm sure i emailed RJC but having just checked my sent box i can't find it, thinking about it, i did it direct through their site so it won't be in my sent box, idiot!)
so i think i have found the answer, just need to order now!
appreciate the help though guys, i sort of thought not many would be using this set up though so wouldn't have known, should have known better