I stumbled across some Bontrager Race X Lite 700c 18-25 mm butyl tubes today weighing in at 66 grams (0.60 mm thick) with a 36 mm stem (incl. collar and cap). The XXX Lites (which i did not buy) were 58-ish on the shop scales. They were 2x the price...

I looked around to see if there was anything lighter and I'm a bit surprised to find that these seem to be some of the lightest (butyl) tubes I've found.

Quick completely un-scientific comparison: (not my weights - only what I've seen on a few web sites):

Michelin Aircomp Ultralight - 77 g (not sure what valve length)
Vittoria Ultralight - 84 g (not sure what valve length)
Conti Light - 99 g (not sure which size this weight was for)
Conti Supersonic - 45 g?
Maxxis MVS Flyweight - 46 g (these are 0.45 - same thickness as the XXX Lites)
Deda - 92 g w/ 40 mm stems

So I'm a bit surprised. Anyone else?

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Fear is healthy, panic can be deadly

The Conti SS and Maxxis FWs are usually a little over 50gms, depending on the stem.

Vredestein tubes weight 48gm
And challenge are 59-65
But they are latex.

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My new Specialized turbo tubes weighed in at 49g and are butyl. Haven't mounted them yet to test.

I just got some Conti SS 42mm and they weighed in at 50g. They definitely roll better than the stock tubes (96g.) I run anywhere from 110 to 120 psi. So far only three rides on them and I don't know anything about long-term durability. However I'm very impressed by the extra speed they give.

The Specialized Turbo tubes are light (I think mine weighed 58?) and are nice. They hold up well and come pre-talced and wrapped tightly for a jersey pocket.

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“Tuco” in The Good, The Bad and The Ugly, “If you save your breath I feel a man like you can manage it. And if you don't manage it, you'll die. Only slowly, very slowly old friend.”

What about the Vittoria Evo 55gm

Which of these lightweight tubes have removable valve cores so that I can put in tofu extenders and get at least 60mm of stem? I've been riding on the Michelin Aircomp Ultralight 60mm valve stems (non-removable cores) while thinking they're the greatest thing since sliced bread. Now that I've read about these other (waay lighter) options I'm left a little deflated! Pun intended.

the two latex tubes that i sugested have removable valves.

The Conti SS are advertised as removable core, though I can't confirm

Conti SS does have removable valves. I use Conti valve extenders and they work great along with Conti SS. Yesterday on a ride I hit 50mph on a descent. Not quite a supersonic speed but not too bad for my light body (60kg).