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 Post subject: Shifter boss thread spec
PostPosted: Wed Nov 14, 2012 9:16 pm 
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What is the thread spec on the bosses to which the gear leavers attach?

I have a suspicion that they are not metric on my pinarello.


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PostPosted: Wed Nov 14, 2012 9:47 pm 
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d/t levers. should be standard M5. Being Italian they should be metric threads.


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PostPosted: Wed Nov 14, 2012 9:55 pm 
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Montello wrote:
What is the thread spec on the bosses to which the gear leavers attach?

I have a suspicion that they are not metric on my pinarello.


They are typically M5 but having said that, there have been a few obscure bosses over the years. Do you have a pic of the boss?

What issue exactly are you having with them?


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PostPosted: Wed Nov 14, 2012 10:10 pm 
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The threads were a bit stiff, I think when the frame was painted some paint may have gone in the holes.

When I tried it clean them using a spare bolt it didn't feel right, so I stopped that.

When I have used the bolts that go with the levers no problem.

The difference in feel of the thread made me wonder is the tpi was more fine than standard.


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PostPosted: Wed Nov 14, 2012 10:13 pm 
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Montello wrote:
The threads were a bit stiff, I think when the frame was painted some paint may have gone in the holes.

When I tried it clean them using a spare bolt it didn't feel right, so I stopped that.

When I have used the bolts that go with the leavers no problem.

The difference in feel of the thread made me wonder is the tpi was odd.


If it's freshly painted, it should have a tap put through them first; a bolt in a thread with paint will stick. Do the original lever bolts fit something like the bottle boss threads as these are the same M5 size?


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 Post subject:
PostPosted: Wed Nov 14, 2012 10:18 pm 
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The bolts with the levers are in after a bit of tooing and froing to clean the threads.

Just the spare bolt I used seemed to bind a bit after a few turns.

Edit: just tried the gear lever bolt in a bottle cage boss and the vice versa all fits fine. Perhaps the spare bolt I was using for cleaning was duff, dropped it back in the tin now.

Not sure I could have tapped the holes to clean them as the holes are blind, probably only 6mm deep.


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 Post subject:
PostPosted: Thu Nov 15, 2012 2:56 pm 
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Yes run a tap through it will help alot.


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 Post subject:
PostPosted: Thu Nov 15, 2012 3:08 pm 
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Can you get taps with "square" ends to tap shallow holes.

I'd say the hole is 9mm deep ...


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 Post subject:
PostPosted: Thu Nov 15, 2012 3:14 pm 
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Would this be the correct item to clean the thread?

http://www.ebay.co.uk/itm/M5-X-0-8-HSS- ... 3f1ee64638


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 Post subject:
PostPosted: Thu Nov 15, 2012 4:39 pm 
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yes


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