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How to prevent a bent / broken axle on a vintage road bike

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How to prevent a bent / broken axle on a vintage road bike

Old 01-07-19, 10:12 AM
  #26  
TireLever-07
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Freewheel explosions suck. I killed my Hybrid bikes number 1 & 2 that way. Both were steel frames. 1st was a broken axle, bought a new one. When installing the finished wheel in the back yard. I saw the broken axle drop out. Second hybrid. I was riding home. In one city block of brick crosswalks. I was close to home. At the third crosswalk. I broke the axle, rear dropout & got a flat all at the same time. Fixed the flat & rode home slower. But still faster than walking. Nobody wanted that bike frame or the fork. Have all it's components in Container Store baskets. On shelves in the basement. On my last skinny tire fast bike, I owned. That was a freewheel bike. Last year or 2 before index shifting. I upgrade the drive train on that one. And sold it rather quickly. And in October 2018. I broke the frame of touring bike #2 . Broke the downtube. About 2" above the drop out. The crack goes all the way around the downtube Is a filled welded steel frame Does have a lifetime frame warenty. I have put in a claim, but who knows.. Down to 2 bikes & one unicycle.
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Old 01-07-19, 02:12 PM
  #27  
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I cured it with an Oversized Axle Sealed bearing hub from Phil Wood and next , Rodger Durham's Bullseye Hubs.. .
My 2 touring bikes used a 126 OLD Hub, 6 speed Freewheels.. 13~34t

MY C&V Campag hubs With Wheels replacement axles have not broken , but I don't ride those bikes much.. lately
( the <C> axles may be a bit brittle-hard tempered.. )

this is an interesting new part given the axles are usually breaking at the flex polnt , which is just inside of the cone on the drive side..

though post 17 does not say where they got them ... It would be useful to know..





...

Last edited by fietsbob; 01-08-19 at 02:25 PM.
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Old 01-09-19, 02:19 PM
  #28  
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i go through a lot of scrap bikes and wondered why some rear axles were bent, i noticed on one the spacing was a bit narrow, so you had to tighten it a far bit for the dropouts to close in

could that be the cause, incorrect lock nut spacing?
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Old 01-10-19, 04:29 AM
  #29  
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Maxicar solved the problem a very long time ago (1950s) by making the axle thicker for a couple centimeters at the spot where they break and bend.

Sanshin Gyromaster did the same. Or at least my Sanshin have the section of fat axle. Would be interested if the other versions of that hub marked Specialized and SunTour had the same. The Maxicar was odd, heavy, super expensive, small production, basically lasted forever. Sanshin was a lightweight popular price hub made and sold in quantity.

It's an old problem with an old and simple solution. Instead of taking the simple path Shimano introduced (or rather, reintroduced, as cassette hubs go back to 1930s) cassette hubs and obliged all other players to follow suit. Why keep it simple when there's an opportunity to sell product?
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Old 01-10-19, 08:59 AM
  #30  
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Another solution to bent axle may be to get a vintage phil wood freewheel rear hub. I have had one on my old bike for over 30 years, put plenty of miles on it and haven't had any bent axle problems. I also had a peak weight of 250 lbs during that time.
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Old 01-12-19, 10:07 AM
  #31  
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I had the problem of breaking spokes, breaking QR skewers, and bending rear axles on my bikes back 24 25 years ago too. Not as frequently on my road bikes as my MTB. At the time, I was 230 or so pounds (wish I was now!), and put a serious hurt on lots of parts. My solutions started with straight 16 gauge spokes and 36 hole wheels. I went with wide flange hubs for the rear of my MTB, in a 4 cross pattern. And I hated it, but a nutted axle replaced the QR. I never bent or broke that rear wheel on my MTB again. I'm nowhere near as hard on bikes as I was. Won't likely again, due to injuries since. That was my solution a lifetime ago...
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