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How to measure for disc brake braze ons

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How to measure for disc brake braze ons

Old 01-04-21, 03:14 PM
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grizzly907la
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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!
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Old 01-04-21, 04:04 PM
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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
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Old 01-04-21, 07:06 PM
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Originally Posted by unterhausen View Post
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
Thanks for the info. I think I am going to go from catilever brakes to v-brakes. That way I won't have to spend cash on getting the brackets welded on, the cash it would cost to buy a new wheelset and fork.
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Old 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.
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Old 01-04-21, 10:19 PM
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Originally Posted by unterhausen View Post
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.
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.
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