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PostPosted: Thu Sep 06, 2012 11:07 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4431
Location: Herts UK
stem bolts and bar clamp tend to be m5; the headset cap is m6.

i'd would think serioulsy of fitting ti (not doen it yet but many have) to stem - alloy bolts are definitely a no-no. Image


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PostPosted: Fri Sep 07, 2012 12:24 am 
Old School Hero

Joined: Fri May 08, 2009 5:17 pm
Posts: 226
Location: Edinburgh
Bolts are best specified by outside diameter of thread x thread pitch. Thread pitch for metric bolts is how many mm between threads.
So M6x1.25 is 6mm outer diameter with 1.25mm between the threads.
Thread pitch is possible to measure by counting the threads in say, 25mm of bolt then dividing 25mm/number of threads. Or you can get a thread gauge which you mesh with the threads, like this
Image

Like the others say, Alu bolts in your stem aren't a good idea other than possibly your top cap. Ti is miles better but watch out for corrosion - Alu and Ti galvanicaly corrode really badly together


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PostPosted: Fri Sep 07, 2012 7:53 am 
Retro Guru
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Joined: Tue Aug 07, 2007 12:22 pm
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Location: Platsa, Messinias, Greece
eastsidebikes wrote:
Bolts are best specified by outside diameter of thread x thread pitch. Thread pitch for metric bolts is how many mm between threads.
So M6x1.25 is 6mm outer diameter with 1.25mm between the threads.


There is actually no such preferred size as M6 x1.25mm, though I know this was just an example.

M6 and M7 will be 1mm pitch as will M8 fine, M8 coarse being 1.25mm.


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PostPosted: Fri Sep 07, 2012 8:02 am 
Gold Trader
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Joined: Wed May 20, 2009 1:29 pm
Posts: 10798
Location: Manchester, UK
so...

NO ALLOY BOLTS IN A STEM!


Top cap bolt is fine in alloy though, as are the cable clamp bolts on your mechs (M5), band clamp bolt on front mech (M5), pivot bolt on rear mech (eg SRP), shifter mount clamp bolts (generally M6).

If your stem bolts are the same size as your disc calipers bolts, then they are M6.


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 Post subject:
PostPosted: Sat Sep 08, 2012 8:27 am 
Gold Trader
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Joined: Thu May 07, 2009 9:12 pm
Posts: 2941
So I have to stick with boring coloured bolts :(


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PostPosted: Sat Sep 08, 2012 8:29 am 
Gold Trader
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dirtydozen wrote:
So I have to stick with boring coloured bolts :(


or pricey titanium gold coloured?


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 Post subject:
PostPosted: Sun Sep 09, 2012 1:31 pm 
Old School Hero

Joined: Fri May 08, 2009 5:17 pm
Posts: 226
Location: Edinburgh
Or colour them in with a gold pen :D


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PostPosted: Thu Sep 13, 2012 9:33 pm 
Gold Trader
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Joined: Thu May 07, 2009 9:12 pm
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Pmsl where do I get this to ones then lol yes iam a tart


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 Post subject:
PostPosted: Wed Sep 19, 2012 3:35 pm 
Dirt Disciple

Joined: Wed Aug 22, 2012 1:01 pm
Posts: 38
eastsidebikes wrote:
Bolts are best specified by outside diameter of thread x thread pitch. Thread pitch for metric bolts is how many mm between threads.


I thought it was the depth of the threa rather than the distance between. So for internal threads you can measure the internal hole (including the thread) and then take an educated guess, so if your hole is metric and 8.75mm wide, its going to be an M10x1.25 thread. Useful if you can get a verier caliper or a hole guage in, but not a thread guage. Just measure it accurately.


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 Post subject:
PostPosted: Wed Sep 19, 2012 4:19 pm 
Gold Trader / PoTM Winner
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Joined: Mon Aug 08, 2011 2:35 pm
Posts: 2784
Dead Rats wrote:
:!:

gold ano bolts in a stem?

:!:



PANIC

Just had to go back and check my ebay history.....
Phew, just another senior moment..... i got gold ti after all :wink:


G


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