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Author Topic: A possible solution to cracking Rohloff shells  (Read 4038 times)

rogerzilla

  • When n+1 gets out of hand
A possible solution to cracking Rohloff shells
« on: 15 July, 2009, 09:27:55 pm »
Aaron's Bicycle Repair

They'll drill them for 48 spokes.  This seems to involve drilling them for 64 and leaving a few empty; some people use the same technique to lace a 40 hole hub to a 32 hole rim, although you'd have to ask their advice on the mixed spoke lengths required.
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nuttycyclist

Re: A possible solution to cracking Rohloff shells
« Reply #1 on: 16 July, 2009, 01:05:32 am »
Wouldn't drilling more holes put them at greater risk of cracking  ???
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Jaded

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Re: A possible solution to cracking Rohloff shells
« Reply #2 on: 16 July, 2009, 01:08:20 am »
Drill, Baby, drill.
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rogerzilla

  • When n+1 gets out of hand
Re: A possible solution to cracking Rohloff shells
« Reply #3 on: 16 July, 2009, 06:25:29 pm »
You should just about be able to go cross-4 with 48 spokes notwithstanding the flange size, and cross-4 is least likely to crack flanges because it's virtually tangential.  And the flanges are so large that there's plenty of space for 24 holes per side.

Rohloff really need thicker flanges and/or a steel shell option, though.  You could have metal flanges and a CF main shell, like an old Nuke-Proof hub, and the weight wouldn't be much higher.

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Wowbagger

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Re: A possible solution to cracking Rohloff shells
« Reply #4 on: 17 July, 2009, 12:03:03 am »
I understand that Thorn already have a supply of 48-hole Rohloffs for their own use only.

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salar55

Re: A possible solution to cracking Rohloff shells
« Reply #5 on: 05 September, 2009, 03:54:22 pm »
Hi   Another way did DT Swiss not have a stainless steel hoop to  beef up   the flange on tandem hubs. Cracked flanges are part of life with a tandem ,  edco and hope hubs have failed with us  . When our last set of Hope fail will buy Phil Wood and they may fail as well . Tandem +2 cyclists + camping gear + very high pressure in tyre  is hard on hubs , not to mention potholes.
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Adam

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Re: A possible solution to cracking Rohloff shells
« Reply #6 on: 06 September, 2009, 08:05:18 am »
Quote from: nuttycyclist on 16 July, 2009, 01:05:32 am
Wouldn't drilling more holes put them at greater risk of cracking  ???

Not necessarily.  I think the logic is that a crack won't develop past a drill hole.  On light aircraft, if the perspex on the windows or part of the metal fuselage has a small crack, the approved fix is to drill a hole just at the end of the crack, which then stops it expanding further (obviously for the windows you then squirt acrylic on, to waterproof it). 

So for the hubs, if a crack develops at the base, it shouldn't go further than the next hole.
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Ian H

Re: A possible solution to cracking Rohloff shells
« Reply #7 on: 06 September, 2009, 11:17:56 am »
I recall being told that forged hub shells are stronger than turned ones. Which are Rohloffs?
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