How does the bolt-on cog work?
It’s very simple. Instead of using a thread on the centre of the cog to screw onto a matching thread on the hub, the VeloSolo cog bolts directly to the hub. The majority of mountain-bike disc brake hubs use the ISO standard 6 bolt mounting. Instead of mounting a brake disc onto these mounting holes we manufacture a custom made series of cogs with the same drilling pattern. Thus our cogs simply bolt onto the hub in place of the disc. As the cog is bolted (fixed) to the hub it can be driven by the chain forwards or backwards and becomes a fixed wheel.