Technical > General Technical
Eccentric bolts
UKTony:
--- Quote from: mickeg on April 04, 2022, 02:11:29 pm ---If you are concerned about losing an eccentric bolt, I was too, keep one in my spares for touring.
--- End quote ---
“Shortly after leaving Eureka, I had yet another mechanical issue. After hearing a cracking noise coming from my bottom bracket, I noticed that I had lost one of the two bolts holding the eccentric shell in place. I had foolishly forgotten to bring a spare, so I needed to order some from England. This was an exotic, finely threaded bolt I wouldn’t be able to find anyone in the USA, apparently. I had them sent to a Warm Showers host in Challis, about 10 days ride away. I would just have to deal with the annoying sound for a while. “
Quote from Tara Weir at,
https://followmargopolo.com/blog-4/
mickeg:
--- Quote from: UKTony on April 04, 2022, 05:14:37 pm ---...
“Shortly after leaving Eureka, I had yet another mechanical issue. After hearing a cracking noise coming from my bottom bracket, I noticed that I had lost one of the two bolts holding the eccentric shell in place. ...
...
--- End quote ---
To make a long story short, when I start a tour with my Rohloff bike after an airplane trip to get there, my bike is packed in the S&S case, thus fully disassembled. And before I leave home, I do the Rohloff oil rinse with cleaning oil, drain, but do not add fresh oil until I assemble the bike after a plane ride.
So, I am handling a LOT of small nuts, bolts, washers, and Rohloff drain plugs. I want to have a spare of every small part I can think of. M5 bolts, M6 bolts, eccentric bolt, Rohloff drain plug, quick chain links, washers, cables, etc.
And since I use blue (removable) threadlocker on my rack bolts, I even carry a bottle of threadlocker with my spares too.
JohnR:
--- Quote from: Coaster on April 03, 2022, 07:28:08 pm ---Thank you all. Now the drain plug has fallen out of the Rohloff and disappeared!
--- End quote ---
Not Thorn / SJS but available on ebay https://www.ebay.co.uk/itm/124097942900. Alternatively get the oil change kit which includes a new plug https://www.sjscycles.co.uk/tools/rohloff-full-oil-change-kit-8410 and add a spare plug https://www.sjscycles.co.uk/hub-spares/rohloff-screw-in-drainplug-for-speedhub-50014-8205 so they share the delivery charge.
Danneaux:
--- Quote ---...This was an exotic, finely threaded bolt I wouldn’t be able to find anyone in the USA, apparently....
--- End quote ---
So! This caused a Danneaux trip to the garage in search of a suitable in-a-pinch substitute.
Found one.
Thorn's eccentric grub screws are threaded M8 x 0.75 extra-fine pitch -- the same thread as a crankset chainring bolt. I found a 1/4in ball bearing will nest against the inner shoulder of the hollow chainring bolt and will also engage the dimple left in the eccentric by the proper bolt.
While far from an ideal substitute, this could well get one by until a proper Thorn eccentric grub screw could be found. Might work well enough to quell any noise caused by having only one grub screw.
Best,
Dan.
John Saxby:
12.5 ft-lbs, Mike, near as I could figure to the upper limit. "Old money", I know, but that's what's on my torque wrench.
Cheers, J.
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