A couple months ago I built my first fixie as a $50 Build-A-Bike out of used parts at a donation/volunteer bike shop. Earlier this week I was messing around on my bike and broke the cog/lockring setup and stripped the hub. Recently, I've been buying parts to build a fixie from scratch, and I've almost ordered all the parts, but I've been holding off on buying the rear hub because I want to do a 6-bolt cog setup with a front disc hub rather than a lockring.
The frame I ordered is the Aventon Mataro framset (not the Mataro Low), and although it is not stated on the website, I've searched around and found the spacing on the front and rear are 100/120mm respectively, which seems consistent with modern track frame spacing. However, I cannot find a front (or rear) disc hub that is 120mm. Because I can't bend the aluminum frame to fit the hub, how can I mod a hub to fit the frame? Are there spacers I can put in to make up the extra 20mm?
I've been holding off on buying the rest of the wheel parts so that I can place one order on prowheelbuilder, so any solution that would be available from that site would be appreciated.