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 Post subject: Ti brake bosses
PostPosted: Thu Dec 30, 2010 3:13 pm 
King of the DuckBoard
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Can any one tell about the cro-mo bosses? As i'd like to replace them with ti bosses. But the ti on the left wont fit :(

Thanks


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 Post subject:
PostPosted: Thu Dec 30, 2010 3:23 pm 
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Is the OD of the threaded section the same and is the pitch on both the same? (looks like it, at 1.25mm).


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 Post subject:
PostPosted: Thu Dec 30, 2010 3:43 pm 
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They both look the same size but it looks like a different thread on the Ti one, and a longer threaded section. Not sure what the thread could be as they are both metric.


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 Post subject:
PostPosted: Thu Dec 30, 2010 3:59 pm 
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the thread on the ti is wider and wont screw in all the way. A bit of standardization wouldn't be a bad idea :roll:


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 Post subject:
PostPosted: Thu Dec 30, 2010 4:09 pm 
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Tazio wrote:
They both look the same size but it looks like a different thread on the Ti one, and a longer threaded section. Not sure what the thread could be as they are both metric.


I presume that they are both probably M10x1.25, but how do you know that they're both metric - the steel one could be 3/8" x 20TPI (unlikely, I know).

Thirty seconds with a micrometer and a thread gauge would answer that, of course.
What are the steel posts from, as a matter of interest?


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 Post subject:
PostPosted: Thu Dec 30, 2010 4:25 pm 
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This is the size of ti ones.

The cro mo ones came with my ti forks that i have just got from China. Knew i should have asked for ti bosses as well :roll:


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 Post subject:
PostPosted: Thu Dec 30, 2010 5:10 pm 
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In that case, what I would suggest is that you run an M10x1.25 tap down the bosses on the fork legs - it seems that for some reason they (and the brake posts) must be slightly undersize. As the pitch looks to be the same however then re-tapping should do the trick.

It's a standard (and common) metric size and any engineering company or car repair place would only take 10 minutes to do it. If you get stuck I've got M10 taps and a wrench that I could lend you, so you could do the job yourself.


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 Post subject:
PostPosted: Thu Dec 30, 2010 5:51 pm 
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Andy R wrote:
In that case, what I would suggest is that you run an M10x1.25 tap down the bosses on the fork legs - it seems that for some reason they (and the brake posts) must be slightly undersize. As the pitch looks to be the same however then re-tapping should do the trick.

It's a standard (and common) metric size and any engineering company or car repair place would only take 10 minutes to do it. If you get stuck I've got M10 taps and a wrench that I could lend you, so you could do the job yourself.


Thanks. A mate has the tools to do the job. Letting me loose on such things is a very bad idea. It would be RIP ti forks :oops: :lol:


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 Post subject:
PostPosted: Thu Dec 30, 2010 6:08 pm 
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It looks to me from a quick count that there are 5 threads on the Ti for 6 threads on the Steel.

Different threads unfortunately.

Welcome to china ;)

have had some things from there (bought over here, scientific stuff) that use a 5/32'' BSW thread and not actually one compatible available in USC size. Turns out it the Mechano size.. Guess that what they had handy at the time :roll:


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 Post subject:
PostPosted: Thu Dec 30, 2010 7:59 pm 
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Just put an old seatpost on the end of your spanner and force them in tintin.........go on......I know you want too :lol: :lol: :lol:


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