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3 comments
I can't find anything on the 30's. But the 50's only have 30mm.
Not a big fan of valve extenders.
How deep are your EA30 rims? Specialized (v. short valve) and Conti tubes aren't as good as Schwalbe SV15 for me, which has a 40mm valve which should be OK for rims than 30mm.
For deeper section wheels Schwalbe SV15XL (or SV20XL, the lightweight version) have an very long Presta valve, just long enough for 50mm rims.
Get yourself some valve extenders and you'll never be caught out.
Something like this http://www.wiggle.co.uk/bbb-bti-97-valve-extension-50mm/