Some Gearing Q's

On my XC bike, im running 32x18 at the moment. So far its a nice ratio for the trails, but its way easy for any type of commuting.

I just converted my Freeride bike to SS and I'm running a 32-16 setup. So far it's the cats ass.

I've run 34x18 for trails and it kicks my ass on the ups, I have currently 34x16 that I use for commute and flat riding. I'm not in good XC shape though. Most start with 2 to 1 ratio and if you r strong go up if you r weak drop it down. Since u r running 46x16 fixie u prolly have some strength and might want more than 2 to 1 but depends on ur trails too.

Depends a lot on the kind of terrain you want to ride - if it's mostly rolling fireroads and singletrack then something like 34:16 or 32:16 will probably be as good a place as any to start. If you have lots of very steep and/or tricky climbs in your area or if you do a lot of technical nadgery type of riding you may want to go to a lower overall gearing, something like 32:18 or even 32:19

I use 32:19 at the minute but hardly any of my riding is on the flat, here it's mostly all up or down, plus I don't have to ride on tarmac for more than a mile or two to get to the off-road stuff. I'd rather put up with the spinniness on the more level sections to have a slightly "deeper" gear for the difficult stuff.

It's all a personal thing really, but the "standard" singlespeed gearing for off-road is 2:1 (ie 32:16 or equivalent). You could run 44:22 of course, but the smaller chainring is a big advantage in respect of the extra clearance it gives for log crossings etc. (if you do that sort of stuff....)