thread size of derailleur bolt/drop-out
Jim
figure the bolt thread size for the hole in the rear dropout that the
derailleur bolts into. I think its a 10 mm size but if metric, what is
the pitch? I have tried every bolt I could get my hands on metric and
english and none seem to screw into that size hole. I have made my own
drop-outs and want to attach the deurailleur so I need to drill out that
hole and thread it so would love to know the tap size.
Thanks,
Reese
Borgis
Jim <mystr...@earthlink.net> skrev i
diskussionsgruppsmeddelandet:3755C78E...@earthlink.net...
You're right about it being metric 10 mm. :-) It's 10x1 in fact.
/Borgis
Jeffrey L. Bell
>You're right about it being metric 10 mm. :-) It's 10x1 in fact.
Campy is 10mm by 26 TPI with a 55 degree thread angle.
-Jeff Bell
John Thompson
> I am in the process of building a recumbent bike and am trying to
>figure the bolt thread size for the hole in the rear dropout that the
>derailleur bolts into. I think its a 10 mm size but if metric, what is
>the pitch? I have tried every bolt I could get my hands on metric and
>english and none seem to screw into that size hole. I have made my own
>drop-outs and want to attach the deurailleur so I need to drill out that
>hole and thread it so would love to know the tap size.
Most derailleur hangers are 10x1mm; Campagnolo's are 10x26tpi
which is close enough to work with 10x1mm but not exactly the
same.
-John (John.T...@ibm.net)
Jeff Goelz
> Campy is 10mm by 26 TPI with a 55 degree thread angle.
well, yes
10 x 1
10mm x 26 TPI roughly equals 10x1 as 15.4mm to 1 inch...
I blieve both are EXACTLY the same, as i have NEVER seen a campy size vs.
standard tap and every bike ive tapped worked fine for both campy and
shimano, as well as bikes already tapped.
Anyone care to confirm (or put me in my place)...
Jeffrey L. Bell
>
>> Campy is 10mm by 26 TPI with a 55 degree thread angle.
>
>well, yes
>10 x 1
>
>I blieve both are EXACTLY the same, as i have NEVER seen a campy size vs.
>standard tap and every bike ive tapped worked fine for both campy and
>shimano, as well as bikes already tapped.
For all practical purposes you are right.
They aren't EXACTLY the same, but they are close enough for drop outs,
because the threaded part is pretty short. If you tried substituting
26 TPI for 1mm on a bolt that where the threads were engaged for 2cm
it would be off by half a thread by the time you got to the other end
and the bolt would bind or strip.
Third Hand does sell taps in both threadings, although the campy tap
is 4 times as expensive.
-Jeff Bell