I have a Mk 2 nomad where I have replaced the standard fork with a fork design for a Mk3 Nomad

the new fork is about 15 mm shorter crown to axel length which, when used with two 26 inch wheels Will give a slightly steeper head tube and see tube angle than the originally intended geometry.


As the mk3 nomad fork is designed to also accept 27.5" wheels, I am considering mulleting the mk 2 nomad

Mullet bikes for those not familiar, have a larger front wheel than rear wheel
typically 29 inch front and 27.5 rear
although plenty of people have tried it with 27.5 front and 26 rear.

Given that the new fork has a shorter crown to axle length, it shouldn't have as much impact on the geometry as it would to do this with a different frame.
(Ever so, slightly slacker head tube and see tube angle than originally intended)

Has anyone tried this yet with the mk2 nomad?


I'm running 2.5 inch Surley extra teresterial tyres.

I have a few spare front wheels, so I'm planning to try both of 26 inch and 27.5 inch front wheel with the same tyre for initial comparison.

If it works, I could always use a slightly wider tire at the front and it opens up options to the wider range of tyres available in 27.5.

Ewan

My Nomad began trembling as ‘Old School’ made his intentions clear!! 😂

One of the drawings at https://www.rohloff.de/en/service/handbook/oem shows that the end of the OEM axleplate is 32mm from the axle centre provided I have interpreted it correctly. How long is the dropout? The Rohloff guidance I noted previously shows that the worst torque condition is in bottom gear and the torque is backwards relative to the wheel rotation. This means that the force from the axleplate will be pushing upwards into the dropout assembly which looks quite strong. If in gears 12, 13 and 14 then the torque is in the opposite direction but is a much smaller force.

The Rohloff documentation somewhere gives a design loading which I concluded represented an overweight gorilla riding the bike (or maybe it's the tandem case with two strong riders?). I was happy to adopt a substandard solution on my Rohloff bike on the basis that I'm at the lighter end of the weight range. My opinion is therefore that this will work provided the support block remains in the dropout under all chain adjustment positions and you don't weigh 140kg. Given that the chain length can be adjusted in increments of 1" (25.4mm) unless using a half link, it might be necessary to choose the chainring / sprocket combination which provides the required gearing while keeping the axle close to the back of the dropout.

Bullet cam https://www.chilli-tech.com/action-cameras? The new version has the option for a cable to an external battery but doesn't mention the limit to the size of the memory card if wanting to record all day. I tried one of the older bullet cams which made me realise how much I wobbled from side to side when pedalling! I suspect that the image stabilisation on the more expensive of the new models doesn't compensate for wobble.

I can't recommend specific editing software. I would start with whatever is available for free and see if it does the job. If not, this exercise helps getting to know what features are needed in any paid-for software.

Have you purchased the Trickstuff Exzentriker?  I’ve not seen one in the flesh but it looks as though it comes with the bearings pre-installed in the eccentrics. External bearings seem to be more susceptible to water ingress than the internal bearings of conventional square taper cartridges; I trust that the bearings are both well sealed and easily replaceable.

Given also that the bearing housing is designed to thread into a standard BSA BB (1.37in X 24TPI), and the male threaded inserts will further reduce this diameter, there cannot be a great deal of adjustment to move the 24mm crank spindle backwards or forwards. Presumably you will need to use half links, or am I missing something.

It also seems that the drive side and non drive side eccentrics are independently adjustable. How do you ensure that the two bearings are concentic and the crank spindle is perpendicular to the vertical plane of the bicycle? 

All in all, it look to me to be a solution to a problem that could be solved more easily and more cheaply by other means. Is there any reason why you cannot use a chain tensioner?