Different tube brands make different length for the valve which leads you to the extension you need. Make up your mind if you wanna go latex or butyl.

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-shoki

80mm valve stems. Example:

Continental Light 80mm Presta Valve Tube, Black, 700 x 18-25cc https://www.amazon.com/..._r_awd_Uv6Dub0BKQY5N

80mm valve or a 60mm valve with a small extender. I do a 60mm vittoria latex tube with a Conti valve extender, but the silica valve extenders are really nice as well.

The rim is 58mm deep. You want a minimum of 20mm sticking out of the rim. So just make sure your valve length + extender is 80mm.

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Ben Waite | Zipp Senior Design Engineer | The Power of Bicycles: Please contribute to World Bicycle Relief | Zipp | SRAM | Quarq |

I picked up some Zipp 404s this morning at my LBS black Friday sale and as pleasantly surprised when I found out they came with tubes from Zipp, problem solved :)
Thanks for the help everyone!

Yeah I've gone 5,000 miles on one of those Zipp tubes. Just last week it finally gave and I still think it had more life in it but the inside of my rim was sandy so it punctured. Great tubes though.

I only use my Zipps for racing (can't afford to replace them easily) so I use vitorria latex which have removable cores as mentioned and I have 2 or 3 lengths of extensions. I pick the shortest one I need. Just remember that the extension on your spare MUST BE as long as your deepest rim. Otherwise you'll have to F with changing the extension out on the side of the road.

...which means for spares, I use butyl tubes with removable cores.

Plus you need removable cores to easily add sealant... which everyone should have as cheap insurance in latex or thin butyl race tubes.

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