Re: Increasing Drum brake performance

black twingle /
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JamesG, that's awesome! I did not know that.

I've only ever worried about shoe placement to the extent that I make sure they are engaging the drum surface without rubbing anything.

Does the "loosen wheel / grab a fistful of brake / tighten wheel" trick work with sealed bearing wheels too? Wouldn't the spacer tube that runs through the middle keep the brake's face plate in pretty much the same place?

+++

Andyh, interesting point. I'm not sure it would work, though.

If you increased the size of the anchor pin, the shoes would be further out at rest, and would extend further each time you pulled the lever. So, wrapping the anchor pin would make your clearances tighter (which is probably good). Also, it would change the angle at which your shoes hit your drum surface (which might be good, or might be bad - I know that it's hard to get the ideal angle).

The reason I do not think that it would really work is that changing anchor pin size is a linear change - whereas changing the size of the cam, or the length of the lever changes how far the brake shoes move each time the brake lever is pulled. This means that you can change it so that pulling your lever the same amount engages your brakes more or less forcefully.

Changing how far your brake shoes sit from the drum wall without changing any of the levers in the system will only change how quickly they engage. If you can pull on your brake lever with all of your might and still not stop your bike, changing the size of the anchor pin won't help (it will just more quickly engage your ineffectual brake).

Full Disclosure: I didn't know what an "anchor pin" was called until you told me (so, thanks!). I know drum brake designs that I've seen, and am always ready to be surprised.

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Subject Written By Posted
  Increasing Drum brake performanceTopic by: Colinswoop . Colinswoop . 02/23/09 02:25PM
  Re: Increasing Drum brake performanceRe: King Drunky JCams King Drunky JCams 02/23/09 02:40PM
  Re: Increasing Drum brake performanceRe: Colinswoop . Colinswoop . 02/23/09 05:55PM
  Re: Increasing Drum brake performanceRe: Emperor Swagustus Emperor Swagustus 02/23/09 03:11PM
  Re: Increasing Drum brake performanceRe: steve steve 02/23/09 04:18PM
  Re: Increasing Drum brake performanceRe: black twingle black twingle 02/23/09 05:56PM
  Re: Increasing Drum brake performanceRe: Mark Mark 02/23/09 06:08PM
  Re: Increasing Drum brake performanceRe: Colinswoop . Colinswoop . 02/23/09 11:36PM
  Re: Increasing Drum brake performanceRe: Chris Rice Chris Rice 02/24/09 12:34AM
  Re: Increasing Drum brake performanceRe: steve steve 02/24/09 12:53AM
  Re: Increasing Drum brake performanceRe: heather heather 02/24/09 02:24PM
  Re: Increasing Drum brake performanceRe: steve steve 02/24/09 02:37PM
  Re: Increasing Drum brake performanceRe: heather heather 02/24/09 03:01PM
  Re: Increasing Drum brake performanceRe: King Drunky JCams King Drunky JCams 02/24/09 03:10PM
  Re: Increasing Drum brake performanceRe: Zeke Zeke 02/24/09 03:28PM
  Re: Increasing Drum brake performanceRe: Eric P Eric P 02/24/09 09:32PM
  Re: Increasing Drum brake performanceRe: Downhill Harvey (OFMC) Downhill Harvey (OFMC) 02/24/09 10:07PM
  Re: Increasing Drum brake performanceRe: W Coop W Coop 02/25/09 12:04AM
  Re: Increasing Drum brake performanceRe: Flagrant - Flagrant - 02/25/09 02:59AM
  Re: Increasing Drum brake performanceRe: Graham Motzing Graham Motzing 02/25/09 03:39AM
  Re: Increasing Drum brake performanceRe: Sunset Paul Sunset Paul 02/25/09 06:33AM
  Re: Increasing Drum brake performanceRe: black twingle black twingle 02/25/09 12:30PM
  Re: Increasing Drum brake performanceRe: heather heather 02/26/09 01:01PM
  Re: Increasing Drum brake performanceRe: Emperor Swagustus Emperor Swagustus 02/26/09 01:17PM
  Re: Increasing Drum brake performanceRe: Flagrant - Flagrant - 02/26/09 01:40PM
  Re: Increasing Drum brake performanceRe: King Drunky JCams King Drunky JCams 02/26/09 01:43PM
  Re: Increasing Drum brake performanceRe: Mike Bartell Mike Bartell 02/26/09 04:20PM
  Re: Increasing Drum brake performanceRe: leee leee 03/03/09 04:45PM
  Re: Increasing Drum brake performanceRe: Mike Bartell Mike Bartell 03/03/09 04:55PM
  Re: Increasing Drum brake performanceRe: black twingle black twingle 03/03/09 06:15PM
  Re: Increasing Drum brake performanceRe: Mike Bartell Mike Bartell 03/03/09 11:08PM
  Re: Increasing Drum brake performanceRe: Matt Bengry Matt Bengry 03/04/09 12:01AM
  Re: Increasing Drum brake performanceRe: heather heather 03/04/09 03:42AM
  Re: Increasing Drum brake performanceRe: brendanM brendanM 03/04/09 04:05AM
  Re: Increasing Drum brake performanceRe: dallas dallas 03/04/09 10:22AM
  Re: Increasing Drum brake performanceRe: Flagrant - Flagrant - 03/04/09 01:05PM
  Re: Increasing Drum brake performanceRe: Charles Cole (OFMC) Charles Cole (OFMC) 03/04/09 02:25PM
  Re: Increasing Drum brake performanceRe: NickCB NickCB 03/04/09 03:37PM
  Re: Increasing Drum brake performanceRe: ; . ; . 03/05/09 10:24AM
  Re: Increasing Drum brake performanceRe: ; . ; . 03/05/09 07:34PM
  Re: Increasing Drum brake performanceRe: James G James G 03/05/09 10:08PM
  Re: Increasing Drum brake performanceRe: black twingle black twingle 03/06/09 11:39AM
  Re: Increasing Drum brake performanceRe: James G James G 03/06/09 12:02PM
  Re: Increasing Drum brake performanceRe: MIke applewhite MIke applewhite 03/07/09 12:23AM
  Re: Increasing Drum brake performanceRe: ; . ; . 03/09/09 07:32PM

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