Hello all,

The story: I have a Salsa Vaya with a Nuvinci N360 rear hub. I run the configuration with a single speed chainline, one chainring and one sprocket. My frame has vertical drop outs, and a standard British threaded bottom bracket.

Current setup:
48T chainring
22T sprocket
Sugino RD2 175mm long cranks
Phil Wood 110.5mm square taper JIS bottom bracket
450mm chainstays
Surly Singleator chain tensioner

I want to lose the tensioner, and use a chainring in the 46-48T range with a 22T sprocket. I have achieved magic gear in the past, 38 x 20 & 42-22 w/ a halflink. I am against using smaller sprockets/chainrings because in the past I have put enough pressure on the chain at a dead stop to cause it to skip, and I like the increased wear time for larger parts.

I am considering using an eccentric bottom bracket and a 47T chainring to take up the chain slack. According to FixMeUp! using a 47T chainring gives me a little slack in the line, and the Phil Wood EBB provides 1/4" of eccentricity so it should be fine. I can use the tensioner I have, but honestly the thing is a huge PITA. Removing the rear wheel is a serious chore. I have to unbolt the tensioner and remove it completely to allow for rear wheel removal.

I'm looking for advice on components. I've never before used OBB cranks so I don't know where to start. All eccentric solutions for standard threads use OBB cranks. I'm willing to lose the square taper cranks and bottom bracket that I already own if necessary. Nuvinci requires a 49mm chainline. I know that OBB cranks have a fixed spindle, but I'm curious to know if any standard cranks with a Phil Wood Philcentric will give me a 49mm chainline. Any advice is appreciated.