Fitting new bearings to Mavic hub without the special tool..

Posts

• turnerjohn Posts: 1,249

  December 2012

  Headset press may work ? or a large vice (if you have one that is ?!)
  could the old large washer, threaded bar and large nut trick aka knock up headset press but smaller.

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• 02GF74 Posts: 1,294

  December 2012

  I am guessing the bearings are sealed races like what I have on my Roval hubs.
  
  The tricky part is to get the bearing squarely into the recess. I made a press from a threaded bar and used various sockets, large washers etc to align the bearing, two nuts on the bar to tighten and thus oull the bearing into place.
  
  a photo of the bits involved.
  
  the socket is selected so that it presses on outer race - take your time ensuring the outer race is going in square.
  
  get it wrong and you damage the race, or worse still the hub itself.

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• njee20 Posts: 9,613

  December 2012

  I'd try and find a washer rather than a socket, so it applies pressure to the whole bearing evenly.

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• Monty Dog Posts: 20,614

  December 2012

  You need to concentrate pressure on outer race of bearing, that's why a socket is best

  Make mine an Italian, with Campagnolo on the side..

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• 02GF74 Posts: 1,294

  December 2012

  ^^^ socket for the reason stated - although a flat washer will work as well - the important bit being not to press only on the inner race.

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• njee20 Posts: 9,613

  December 2012

  And I'd say flat is better than socket. How many bearing presses are hollow like a socket?
  
  You'll need a good solution for the Controle SLs, I used to do mine every two rides!

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• big_p Posts: 565

  December 2012

  if you apply any lateral pressure to the inner race you will damage the balls inside the bearing, you should push against the outer race only.
  
  use a socket.

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• 02GF74 Posts: 1,294

  December 2012

  njee20 wrote:

  And I'd say flat is better than socket. How many bearing presses are hollow like a socket?
  

  
  you are correct - the correctly shaped press is flat against the inner and outer races with a recess that fits into the inner race .... but if one doesn't have such a press, then a socket or washers is the next best thing.
  
  like this pair:
  

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• booktownman Posts: 151

  January 2013

  Thanks for all the advice.
  
  Here's the insanely technical approach I employed in the end, and it worked a treat:
  
  I used a short length sawn off a broom handle which - luckily - was a couple of mill smaller in diameter than the bearing. Introduced bearing to seat, broom handle bodger on top, whacked it a few times with a hammer and in it went. Lovely.
  
  Wood to metal also helps minimise the risk of accidental damage, too, I reckon.

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