The t2 tyres are heavier 13120 - 9" MBS T2 Tires (ea.) — MBS.COM
Do you mean t3?
What prototype deck you have there? 
Whoops - yup I meant the t3
Hmm honestly I don’t know anything about it haha. I’ll post pictures once I get it and start a build thread but I don’t really know anything about its origins. 
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MBS t3 are flat tire machines. They are thin tires that are also very damn soft. Carry a complete spare with you.
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I think tires can be a hard place to save weight without compromising performance.
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ASA25 chains and sprockets are OK with 12S 6374 builds. I have one with ALU wheel sprockets (made by Willozboard at the time). It makes a really light drive.
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Do you know what the chains and sprockets weigh in at?
Tubeless tires seems the obvious direction to go for weight savings with the tire/wheel.
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This would be nice, but I assume just like mountain bike tubeless tires you see heavier tires and need some sealant which offsets the 80g weight savings from no tube
I think the sealant is mostly relevant at lower tire pressures, and as a preventative.
And I think probably the easiest way to execute tubeless with Eskate is with a bead lock design, which can deal with any pressure without sealant.
So bolting the hub halves together actually locks onto the bead.
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Going to throw one more thing out, but its wishful thinking.
We’ll see how many decades it is before this is reality, but…
Superconductor motor windings, like say, carbon nanotubes.
1/15th the weight of copper, a fraction of the volume.
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I want to try the new haero esk8 deck with boardnamics 270 
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Before we go into more exotic materials, there are a bunch of cheaper options to save weight.
Fiber-reinforced plastic wheels are lighter than aluminum and have very similar performance. Whittle weight away from parts that are big and chunky. Tubeless wheels. Fiber-reinforced anti-sink plates. Maybe a really well designed carbon fiber deck/enclosure.
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Aluminum motor pulley would be about 35% the weight of steel, but wear out faster. On a 50g pulley, you’d save 32.5g per pulley, or 65g total for a 2wd board.
Titanium is 57% the weight of steel, so you’d 21.5g per pulley, and 43g total for 2wd board.
It would be nice place to save a few grams.
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i saved 0.05g when going from plastic valve cap to titanium valve cap per wheel, so that’s 0.2g whole board
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Man, wait until you see my board with no valve caps
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It’s a good idea, but even with the nylon baseplate, the m2 end up about the same weigt as the new m3 trucks. Stock metal M2 are 900g.
Took me 2 years to wear out aluminum pulley fwiw
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worth quite a lot tbh - aluminum it is. Do you have a link for your pulley of choice?
Sorry I don’t 
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I think certain aluminum alloys are significantly more wear resistant than others based on their elemental composition and heat treatment. Another option is to add a highly wear-resistant coating. Hard anodize?
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