Hi all. I'm wanting to build a fixed gear bike on a Surly Ice Cream Truck frame. That frame comes with modular drop outs, and a pair of forked track ends is one of the drop out sets that comes with it, so I assumed that meant there'd be some way of actually using them. Now that I'm trying to find a single speed hub that I can use with a fix rear cog, there does not seem to be one available that fits the 190MM spacing of that frame. At least not that I can find.

The only 190MM hubs I've found are for standard cassettes. This would not be such a problem, as I'd be ok with using spacers on that type hub and going with single speed (with coasting) if that's my only option, but even then, I don't want to use a chain tensioner. I want to use the forked drop outs and bolt the hub in solidly. Hope and Salsa both make 190MM hubs, but they are either the quick release type, or they are made for the 12MM thru axle that won't work with the forked track ends.

The questions are:

How do I build a fixed (or single speed without tensioner) on a frame that needs a 190MM hub?
or
Anyone know of a 190MM hub that has a 10MM threaded axle in it?
or
Or is there a way to convert an existing quick release hub into a hub with a 10MM threaded axle?

Thanks in advance for whatever advice I can get.

If you're willing to put some $$ into it I'm sure Phil Wood could hook you up. They make fixed gear disc mountain hubs and 170mm fat hubs currently so I don't think it would be much of a stretch to get what you're looking for.

Easiest would be to just run the quick release 190mm hub with either a bolt-on skewer or a decent internal cam QR skewer. Amazingly, these guys offer a 190mm 10mm bolt-on axle: Fat Bike Rear Hubs | Fatbike | Hubs | Products | Halowheels.com

I couldn't find any track hubs spaced at 190mm. Considering basically all track hubs are intended for a 42mm chainline, while this fatbike is intended to run a chainline of ~70+mm, you wouldn't have a usable chainline if you respaced the track hub's axle. You could possibly use a bolt-on disc cog but I have no idea what the resulting chainline would be. (190/2) - ~20mm = 75mm? Hmmm... I'd like to see this attempted.

Bolt on cog for the disc side. Bolt it on, flip the wheel around, done.

Pretty much any standard 10mm axle rear track hub with a custom axle about 250mm long. In most cases you add all the extra spacers to the left side (lots of thread on the left side of the axle).

Does the low tire pressure of a fat bike keep this setup from bending axles? That would be my main concern, other than looking very kludgy.

^^^^^^This is the answer. I keep forgetting that if you're riding fixed you probably won't use the rear disc.

I think the disc/bolt on cog/reverse idea is the best.