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Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

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Old 03-20-17, 07:28 PM   #26
base2 
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Originally Posted by dabac View Post
No.
Inside face of the dropout is the reference. From there it's 4 mm to the inside face of the caliper (adapter) mount.
Thickness of dropout or thickness of caliper (adapter) mount isn't specified on the Hayes drawing I have.
My bet is on the hub, and/or the 6-bolt adapter.



Yes, front mount.
It's what manufacturers should have done from the beginning.
Rear mounted calipers have the nasty habit of trying to eject the wheel during braking.
On an old fork with vertical dropouts and very shallow lawyer lips, it's even more the right thing to do.


Left or right mount has no functional difference. Front or rear has.
But front-and-left would require mounting the caliper upside-down, which would make routing the cable/hose awkward.

Not really. As far as the brake goes, it's just like I'm running the fork backwards. If I were to turn the bars 180 degrees I'd get a bone-stock left/rear brake mount.

Well, I'm certainly not going to cut it out again!

Might tweak the fit some and put a brake mount on the original threaded fork instead.


Really didn't think I'd need to do that when I'd found so clear drawings of how the brake mounts should be.
The original question is "What went wrong?" Obviously something did, else there would be no error. I fully understand all the points you made, and if you'd re-read what I wrote, you would also read that I don't think you are dense, I was trying to be helpful.

I'm playing in my head the kind of thought process that would lead ME to go "WTF?" with my self and my own creations. Flipping a thing over, then turning it around would be the kind of thing that would lead me to reference the wrong index surface...compensating for compensating, if that's a good way to put it. How thick is your front drop out minus paint and this side of part or that? Combined with the spacers, combined with the nuts added/subtracted? 3, 4, 5mm?

I dunno, I just thought it was worthy of mention...the kind of mistake I would make. It's not like I'm a professional bike maker, I just machine airplane things when needed. Left blueprint shown and right side part needed, but reversed, have done me in before, I sort of thought that may be the root cause here too.

Carry on.
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Old 03-21-17, 05:33 AM   #27
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Originally Posted by base2 View Post
The original question is "What went wrong?" Obviously something did, else there would be no error. I fully understand all the points you made, and if you'd re-read what I wrote, you would also read that I don't think you are dense, I was trying to be helpful.

Apologies if I came across as harsh or ungrateful.


There's a bit of frustration in when something that looked to be well under control doesn't end up quite where expected.
This is a project that's been some time in the making. Finding the drawings, collecting the parts, planning it out.


It looked like I had it all figured out, incl where the most likely risk of error was, and how to deal with that.
No need for any on-the-spot improvisations.
Good to go, I thought.
I even chose arc weld instead of brazing not to give the aluminium fixture any chance of distorting due to heat from the process.
Where I expected problems was with getting the caliper in plane with the rotor. A little shrinkage of the welds would be enough to tilt the caliper over.


Finding the assumed problem to work out fine, only to meet a 3 mm lateral offset was as unexpected as annoying.
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Old 03-21-17, 07:20 AM   #28
unterhausen
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I would be really curious to see a commercial brake mount fixture on your fork. It's close enough that it's really hard to see an issue with your fixture. I'm sure there have been many thousands of bikes made with a similar fixtures. All I can say is that the shimano drawings are out there too, look on PVD wiki for those. They are also on the Shimano tech site, but harder to find. If you use it again, I would put it on a known-good fork and make adjustments to it to make it match. I would have checked it any way I could before doing anything requiring repair, but I'm conservative that way.

Last edited by unterhausen; 03-21-17 at 07:25 AM.
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Old 05-31-17, 08:07 PM   #29
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Does anyone sell brackets to attach to a non disc bike?
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Old 06-05-17, 12:29 AM   #30
dabac
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Does anyone sell brackets to attach to a non disc bike?
Oh, sure. Do a net search for "disc brake adaptor" and you'll find plenty.
There's one for the rear from A2Z which is considered decent. Then some ridiculously cheap ones for both front + rear where I can't see how they get the alignment right.
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