I traded into a set of older (2006 I think) Zipp 909 wheelset. Best I can tell, its an 808 rear disc and 404 front. The rear Zipp tire would not hold air so I’m putting a Conti Sprinter tubular on the rear. Seeing as the disc has a rather small valve stem window, I was curious as to what length valve stem extension to use. Is the valve stem that’s on tires a universal length? I notice that Zipp suggests 72mm for the disc, but is that just for their tires, or is it universal?
Also, would the 80mm Vittoria stems be too tall, or is there some wiggle room???
Hi,
I use the TUFO valve steams, available in 21, 28, 31 mm. So just measure it out or by a couple of all lengths and put them together (use some LOCTITE when screwing the extensions)!
Martin
Usually, the short length valves on tubes or tubular tires are about 355mm. This is what you want for a disc wheel. Not the longer 45mm plus lengths or any extenders.
Then you need a right angle "crack pipe " pump adaptor or disc adaptor to inflate it. They usually come with new disc wheels but if you need to get one, probably search for Silca (brand) pump adaptors.
I can’t find any info on what the Sprinter tire valve length is. If most are 35mm, than I’m assuming the 72mm extension the are suggesting means that I need an OAL of around 110?
I traded into a set of older (2006 I think) Zipp 909 wheelset. Best I can tell, its an 808 rear disc and 404 front. The rear Zipp tire would not hold air so I’m putting a Conti Sprinter tubular on the rear. Seeing as the disc has a rather small valve stem window, I was curious as to what length valve stem extension to use. Is the valve stem that’s on tires a universal length? I notice that Zipp suggests 72mm for the disc, but is that just for their tires, or is it universal?
Also, would the 80mm Vittoria stems be too tall, or is there some wiggle room???
Jason
Ahhh, no need to worry about what size extender you need. Just fill the tire first and then install it on the disc…
Yes, 72mm is 7.2 cm and the cut out in a disc is def not 7.2 cm in size. Also, just as a side note to help you in your googling… calling something an 808 AND Disc is actually mutually exclusive. An 808 isn’t a disc, it is a spoked wheel. You may have a Sub9 if there is a hollow “bulge” between the flat disc part and the tire bed. Google some pics and you can find some more accurate info as to exactly what you have (the tubular options are a 900 disc, a sub9, or a super9). The 72mm extension you found and referenced is probably related to this “808” nomenclature confusion. Good luck and enjoy your wheels!