Tag Archives: reviews

Rohloff Rear Cog Wear

The Thorn Raven Tour is equipped with a Rohloff 14 speed internal gear hub. One nice feature is that the single drive cog can be reversed so that additional kilometres can be obtained from it as it wears. Being a single cog it functions as a single speed drive with no lateral chain movement hence less chain wear compared to derailleur gear systems. I like both derailleur and internal hub gear systems. I prefer the Rohloff hub for reliability and durability on long tours. So far there have been no problems with the Rohloff on tour.

Rohloff Cog after 10450km

A 16 tooth Rohloff cog after at least 10450km

The cog above was used on my first long tour of 6124km back in 2013. It was reversed about half way through that tour and reversed again prior to the summer 2016 trans-Europe tour. The picture shows the cog and drive direction at the end of this second 4326km long tour. It has since been reversed again as the ‘shark fin’ wear pattern had become quite pronounced.

I hope to get another 5000km (or more!) from the above cog before fitting the new one below!

Rohloff Cog New

A new 16 tooth Rohloff cog for comparison

If you have a Rohloff on your bike, how many kilometers/miles have you squeezed out of your rear cog?

Comments welcome below!

Magura Odur Fork

Magura Odur fork

There is some discussion about adding a suspension fork to a traditional touring frame on various forums. It appeared from the internet that a maximum of 100 mm travel may be acceptable for the Thorn Raven Tour. Back in 2009 in fact Thorn offered the Magura Odur 85 mm fork as an option. The Magura Menja is of the same solid design but is an air fork.

Thorn Raven Tour with Magura Odur suspension forks

Forums confirmed that there were Thorn Raven Tour owners who had had few problems using the short travel 85 mm Odur fork. It was important it seemed not to affect the geometry of the bike as this can affect stability and steering. Tom of Tom’s Bike Trip has a good review. There is a great four-part video series¬†showing the bikes in action.

Close up of front Magura Odur forks

So the search was on! The Magura Odur fork had, much to the dismay of many expedition tourers, been discontinued in 2009. It was a solid, German manufactured coil spring fork. Were they still available? After over an hour of ‘Googling’ I found a web site in Tallinn, Estonia that appeared to have one in stock. Being so rare, I immediately contacted the shop. After a few emails to the very helpful Rauno at VeloPlus confirming steerer length, V-brake fittings, other specifications, and checking the business out, I transferred the funds and a week later it arrived. It is indeed a solid basic fork fit for purpose. Spare parts and the service manual were found on-line so I should be covered for future maintenance.

Front view of Magura Odur fork

I was now one step closer to an off-road tour. The Great Divide Mountain Bike Route was one trip at the back of my mind. The Magura Odur would be perfect for the washboard tracks that apparently feature on the route.