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.
A few people have asked about doing this – it was a complex job that I can’t really send you a kit for, there was lots of special machining and careful test fitting, and it might not even work on a different Trek frame as the belt runs VERY close to the chain stay. It’s the kind of thing I can only really do in the shop.
