Here is my last conversion. "The Black Horse"
My old Merida cyclocross bike is an all round Single Speed now.
The best of this bike is the frame clearance that allows to use different tyres depending of the weather or season, from 25cc Road tyres until 45-50mm Gravel tyres. Even spikes tyres we use in Winter in Scandinavia. And the disc brakes are so powerful that I am just using the front one, works amazing and looks clean.
40-18/16 gear rate because Norway is very hilly XD. Mounted a flat 670 mm handlebar and gravel/spikes tyres now for fall/winter season, but I will mount drop bars and road/cx tyres after winter.