Campy Record Threadless headset lower stack height

[Locky]

Hi folks,

 

Does anyone know what the lower stack height is for a 1" threadless Campy Record headset? An example here: http://www.totalcycling.com/a-z/headsets/hsrecordah.html

 

Its dead easy to find a number for the overall stack height but not the lower specifically, it seems. I have one on order so can measure it when it arrives but am trying to finalize a frame drawing now and need this data.

 

Cheers,

 

Locky

[Mark Bulgier]

Locky asked

Does anyone know what the lower stack height is for a 1" threadless Campy Record headset? An example here: http://www.totalcycling.com/a-z/headsets/hsrecordah.html

 

Sorry, I don’t know the answer, but if you don’t mind some advice, I’d say pick a typical or middle-of-the-road number like 14 mm and run with it.  It won’t change the handling of the bike if the real number turns out to be 13 or 15.  The bike is pivoting around the rear axle, better part of a meter away, so the difference in angle that makes is approximately um…  not much.  If you truly are that precise with your angles, then you’re a better man than I am Gunga Din.

 

If you thought what I just wrote there is pure waste of time, then I warn you the following is even purer.  Don’t read it unless you have nothing better to do.  (I don’t, obviously).

 

I followed Locky’s link and was amused to see they give the stack height as 25.4 mm.  On a one-inch headset, get it?  What a ridiculous number. Even if it isn’t false precision*

·         Firstly because who would ever need to know the overall stack height of a threadless headset to the nearest tenth of a millimeter?  Even giving it to the nearest mm is overkill – to the nearest cm would suffice, for any sane reason for wanting to know.  Yes knowing the lower stack to within a mm or three is good, but the upper stack?  Who can tell if their handlebars are a millimeter too high or low??  If you raised your hand, you are possibly an idiot savant but more likely lying, or maybe merely mistaken.

·         Secondly, why couldn’t they pick any number other than 25.4?  It totally makes it look like they looked in the wrong column and they’re quoting us the steerer diameter instead of the stack.  Personally I would have quoted the stack as 25 mm, just to avoid having someone wonder if I was possibly that stupid.

 

Mark Bulgier

Seattle

 

* A tour guide at a museum says a dinosaur skeleton is 100,000,005 years old, because an expert told him that it was 100 million years old, when he started working there 5 years ago.

[Ray]

I just measured one and the lower stack is 12.5mm (0.492”)

I think that’s all Locky was looking for ;-)

 

 

Best regards,

Ray

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[Ray]

 

I just measured one and the lower stack is 12.5mm (0.492”)

I think that’s all Locky was looking for ;-)

 

 

Best regards,

Ray

 

From: frameb...@googlegroups.com [mailto:frameb...@googlegroups.com] On Behalf Of Mark Bulgier
Sent: Saturday, October 19, 2013 4:29 AM
To: Locky; frameb...@googlegroups.com
Subject: RE: [Frame] Campy Record Threadless headset lower stack height

 

Locky asked

--

[Dan Chambers]

Just to emphasise Mark's comment on how little effect these small variations on lower stack height make...I reckon that, with a 1m to the rear axle, you'd need to raise the headtube by roughly 17.5mm to get a 1 degree change in angle,so 1mm will only make around 0.175 degrees.

All the best,

[Mathew Amonson]

I believe it's 12.9mm (same as the Chris King 1 in threadless)

I measured it a couple months ago.

I can check again when I'm in the shop.

-Mat

[Locky]

Thank you all for responses, I now have the data I need. I agree with the comments about accuracy, I just like to get my design as accurate as possible as there is plenty of room for error in the construction phase :-) More of a feel good factor than anything. I also was not aware that different headsets are so close in spec in terms of the lower stack height. I certainly agree with Mark that it is frustrating that suppliers don't specify the lower head stack height but rather the total height. I guess this is because most people purchasing headsets aftermarket are probably fitting to an existing bike and just need to be sure their overall steerer length will still suit. Even then, there seems to be such little variance that is probably not likely to be an issue either.

I learn something new every day :-)

 

Thanks all,

 

Locky