Originally Posted by
riderx
Personally I'd just use a rear hub. Disc MTB or a proper fixed. If you are looking for a non-mtb chainline use the Surly 120mm track hub and pop two 5mm spacers on it, I've done it on a Crosscheck before. Cheaper than an axle swap.
The only reason I would use a front disc is if you have a built wheel sitting around unused. If you are building from scratch, use a rear hub. Just my $.02
Hard to fit a 135mm spaced mtb ss hub into a 120mm spaced frame and expect to get satisfactory results. My aluminum Redline monocog is 110mm..theres no way I could fit a 135mm hub in there.
A disk hub eliminates the possibility of stripping the threads, which is a serious concern if you are riding low gear ratios, like on singletrack.