The free wheel on our rear Bontrager Racelite tandem wheel went last week so we thought we'd just replace it. However, when my pilot took the rear hub apart the mechaism is totally different to anything he's seen before.
Rather than a standard free wheel with pawls, there are 2 small (around 4-5 cm) splined wheels. The outer engages with the cassette carrier body which has slots that the splines fit into, and the other engages with the hub body. These two seemingly identical splined wheels are then pressed together by springs on either side of them and the splines are shaped such that they engages when driving forward and allow the wheel to spin freely otherwise.
These are very warn and so I was just wondering whether anyone knows what they are called and whether I can simply by replacements? Or whether there is a fixed wheel version of this interface that we could use to convert the wheel to fixed gear. ie, rather than 2 sparate pieces, just one thicker piece that engaged with both the hub body and the cassette carrier?
I'm affraid i don't even know what these would be called to even look for them so any help would be appreciated.
The hubs I believe are DT Swiss Tandem.