Trek 1120 Rohloff / SON / Belt Drive Conversion

A deceptively complex job, the Trek 1120 is an interesting bike, built with 29″ fat tyres for off-road touring with custom racks. As standard it has derailleur gearing, this was a conversion to Rohloff hub gearing, and adding a Gates belt drive and SON dynamo hub to power lights and a Plug5 charging device. This needed a custom Rohloff A12 hub, custom-machined dropouts, a custom-machined chainset and very careful choice of parts.