May be of interest to anyone converting to fixed but struggling with drop out spacings. I’ve come across a site called velosolo.co.uk which sell a conversion kit to convert MTB Deore disc brake hubs to fixed gear, with sprockets bolting onto the disc rotor mounts. They also sell spacers / solid axles etc.

Interesting idea – you can build the MTB hubs up with 700c rims. A rear Deore could be used as a flip flop. 135mm spacing, which should squeeze OK into a steel 130mm drop out frame. Front hubs are 100mm, but long axles and spacers can be used to get a strong, no dish fixed wheel.

Worth a look if you’re going through a fixed conversion process.