Author Topic: Presta Valve Thread?  (Read 4617 times)

Presta Valve Thread?
« on: 25 May, 2010, 09:36:12 am »
Can anyone tell me what this is?  It just so happens that a Presta valve collar fits perfectly on the thread of a bolt I'm trying to identify. 

Biggsy

  • A bodge too far
  • Twit @iceblinker
    • My stuff on eBay
Re: Presta Valve Thread?
« Reply #1 on: 25 May, 2010, 01:07:38 pm »
M6 x 0.8mm, according to the most believable suggestion on rec.bicycles.tech.

It may be that your bolt is 0.75mm despite 0.8 seeming to be a perfect fit.  That's a more common size.
●●●  My eBay items  ●●●  Twitter  ●●●

Re: Presta Valve Thread?
« Reply #2 on: 25 May, 2010, 02:42:41 pm »
Thanks, Biggsy.

robbo6

Re: Presta Valve Thread?
« Reply #3 on: 25 May, 2010, 02:48:46 pm »
I have just measured one at 6 mm diameter by .75 pitch, which is the old French pre-ISO standard.