How to measure for disc brake braze ons
01-04-21, 03:14 PM
#1
Grouchy Old man
Thread Starter
How to measure for disc brake braze ons
I am sure its a stupid question, but how I measure the distance between the triangle of a bike frame in order to properly have a braze on bracket for a rear disc brake. I just got a trek 1989 trek 930, single track and would like to mount the bracket horizontally. Thanks!
01-04-21, 04:04 PM
#2
Randomhead
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There are fixtures for that. I need to put together a list now that Anvil is gone
https://www.alexmeade.org/Tools.htm
You can search this forum for ideas on how to do it without a fixture. Basically use a wheel and a brake that you don't mind messing up
https://www.alexmeade.org/Tools.htm
You can search this forum for ideas on how to do it without a fixture. Basically use a wheel and a brake that you don't mind messing up
01-04-21, 07:06 PM
#3
Grouchy Old man
Thread Starter
There are fixtures for that. I need to put together a list now that Anvil is gone
custom made frame building tools
You can search this forum for ideas on how to do it without a fixture. Basically use a wheel and a brake that you don't mind messing up
custom made frame building tools
You can search this forum for ideas on how to do it without a fixture. Basically use a wheel and a brake that you don't mind messing up
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01-04-21, 08:19 PM
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That's what I would do and I have everything I need to put a disc mount on there. Also, the paint looks good enough I wouldn't really want to have to refinish it.
01-04-21, 10:19 PM
#5
Grouchy Old man
Thread Starter
I am going to rebuild the bike. Paint it, new BB, maybe a new crankset, Shifters, derailleurs, v-brakes. Quill adapter, some trekking bars and maybe some taller 26" tires. Maybe spiffy up the wheels. I could put new spokes on, however I heard wheel building can be a PITA. The components ware kind of raggety, but I am wondering if they can cleaned up and refurbished. I've been wanting to do a project bike for a while now, and I have one. Apologies for thinking out loud.
03-05-21, 12:33 PM
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CAD file, schematic, or precise measurements for post mounts
Hi, I'm designing a few frames in Fusion360, and I can't find any info on the dimensions or measurements needed for a post mount. Does anyone have any resources on this?
Thanks
Thanks
03-05-21, 01:58 PM
#7
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Post mount info is out there. https://www.google.com/search?q=bicy...w=1288&bih=786
Flat mount is a little more work to find, search for bicycle brake flat mount dimensions. Peter Verdone has written about it some.
Flat mount is a little more work to find, search for bicycle brake flat mount dimensions. Peter Verdone has written about it some.
03-05-21, 03:35 PM
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The spacing is from the dropout face. Although when the PM spec came out they hadn't started playing with where the face is. Through axle has the dropout face 3.5mm outboard relative to the mounts. Which is why I have 2 tiny little spacers for my flat mount fixture.
Okay, I might have garbled this, dsaul will be along shortly to straighten me out.
Okay, I might have garbled this, dsaul will be along shortly to straighten me out.
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