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....for 4" tyres that don't weigh a ton. What are the best options?
I've been using Specialized 2.4-3.0" for 4 years now and had two punctures.
http://www.evanscycles.com/products/specialized/inner-tube-26x24-30-inch-ec001878
Schwalbe sv13 f is another option
Conti dh inner tubes always work(ed) for me!
I started off using the Schwalbe ones when I built up my Puffin.
I had oodles of punctures over a really short period of time - I had 5 on one ride 🙁
Now this may have just been bad luck but I switched them out for Surly lite toobs. Yes they are heavier but I've not had a single puncture since (touches wood) and I can easily run sub 8psi.
What scotroutes said
Yup Spesh tubes here too
Schwalbe 180 gram tubes and no punctures in 2 years.