Author Topic: brake drums 26 EW  (Read 403 times)

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Offline shuswapkev

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brake drums 26 EW
« on: 26 Dec 2016 at 11:28 »


  brake drums..
  I have my front wheel laced up to a 19 inch rim...got down to about .020 runout...
I have the one piece hub and drum with spokes about halfway in the drum

the brake drum has .050 runout...most of this in about 3 1/2 inch on the out of the drum...
  my question...  how accurate are the drums...??   can set up on my mill and grind maybe .010- .015??

how accurate do these drums need to be  ??   generally a lumpy drum is a scary thing to ride on
is there any way to repair this drum??

Offline cardan

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Re: brake drums 26 EW
« Reply #1 on: 27 Dec 2016 at 04:41 »

How's your spoke tension? Certainly drums like the EW design are susceptible to non-uniform spoke tension. Another possibility is that the drum has a "woof" from some sort of mischief in the past.

It wouldn't surprise me if Douglas machined their brake drums after the wheels were built, so in response to "how accurate are the drums?" I'd guess "pretty accurate". That said, 0.050" is a lot to machine out of a brake drum, and I'd experiment with spoke tension first.

Leon