Take a look at the Vredestein latex tubes
. The listings here have them at 45g. You can find them doing a google search. I am riding the Michelin latex tubes, and they are great. A little heavier than the Vred tubes, but work great. I got mine at www.probikekit.com
since they do free shipping.
The Vredestein are by far the better latex inner tubes and not just because they're lighter.
The Michelin rip easily due to the pigmentation of the latex, they also loose quite a bit in strecthing capability because of this too. Same goes for the Vittiora although to a somewhat lesser extent.
I wish people such as Dugast or Veloflex would offer a range of natural latex innertubes as a separate product: they use one for each tubular made so why not offer these for clinchers as well, right?
Because if they did sell them (I for sure would buy them) then few people would buy tubulars. BTW, Michelins ain't so bad (to the OP, for best price get them from probikekit).
I also think if the Vredestein latex tubes were so great we would actually be able to buy them somewhere, but we can't. Probably means to many headaches for shops.
Actually, they are, believe me. You won't know untill you'd start using some none pigmented latex. For use in clinchers they're O.K. though....
Actually, getting anything Vredestein is becoming more and more a royal PITA overhere. Of we want Vred. tubulars, I'd have to look for webshops in the states, If I'd want latex innertubes (which they probably don't manufacture aymore anyway), the closest by is the U.K.
Oh, BTW, if you don't care for weight, but I know you do, then the Pariba latex are extremely comfortable and mate well with Pariba tyres you'd simply deify at high PSI.