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Plus the efficiency of the best air powered vehicles is just horrible, about that of a poor efficiency ICE engine, I went electric to move towards a more efficient use of power than petrol.
While the energy storage of air is also very low (worse than that of lead acid batteries), as already pointed out.

The efficiency related to environmental impact is great, as is efficiency related to cost. Indeed efficiency in terms of weight and volume is poor, as are batteries compared to gas so its not a deal breaker.

I rather sit on a tank which *might* catch fire /../ not be able to outrun the blast radius of the air tank going up...

You emphasize might in the burning battery scenario but not for the air tank blowing up? Biased?

Frankly until air power hits the marketplace, its not worth me considering it as anything more than vapourware. Its like Lithium-Air batteries in that regard.

The vapourware is indeed a deal breaker, I cant argue with that. I just which it wasn't, and I'm curious why it is. Seems to me it have a lot of potentials as a cheap low-end bike.

I'm sure both the founder of Zero and Brammo was tired to death of hearing exact the same arguments over and over again when talking about their ideas of an electric motorcycle.

No range, no performance, explosion-prone, novelty, in-effective etc..
well they changed all that with research and product iteration. A 2008 Zero is a novelty compared to any 2013 model, or even 2012 for that matter.

Again I'm surprised to hear the very same arguments being used against electric in favor of IC-engines. I did not expect to find that kind of rhetorics in this forums.

I think it is very different if you use a steel or aluminum Tank. As much as I know the fire service has carbon fiber tank with higher pressure as scuba.

I think the fire fighter tank is carbon for heat resistance and weight reduction, obviously at a higher cost. Ideally the air-bike would take either, not relying on one specific dimension or type. This would open up to very inexpensive array of extra tanks. Or you would line up the low-end to come with a steel tank and the exclusive version with a carbon

The air idea is nice but I don't believe the 100km range. A Prototype 2011 and nothing happen than gives the idea it was not so successful.

Yeah, the 100 km is very unspecific. But a prototype can always be made more efficient, or you can have it take twin tanks or whatever. Or stay content with a, say 60km true range. I also wonder what happened to it, given the simple construction involved one would think it would be further developed.

BTH When I was young I had an Air-driven toy car 25cm long. You fill it with an (hand) air pump and it was really nice how it was accelerating.

Hehe cool, my daughter has a balloon-driven plastic car about that size which is quite cool.

Wow,
I didn't expect the arguments against air driven motors sounds so similar to when I talk about e-bikes to the general guy. Well, not on this forum at least.
Range anxiety, efficiency, novelty etc. I'm sure you also heard it all before talking about your Zero's.

At least you don't mention 'loud pipes saves life'.

This was a prototype from 2011-12 made by a student, no doubt it can be made more efficient and be more thought trough.

/../ but I really wonder how far you can go on a tank of compressed air?  Talk about range anxiety!  Plus, no doubt as the pressure slowly decreases, so does your top speed and performance.

Article says 100 km (62 miles), no mention at what speed or anything but I would assume at minimum 50 km/h.

Range anxiety is all about how you use it. I have a one way 10km commute to work, a vehicle that manage, say 40km, would not give me range anxiety. Or taking the bike to dirt track and having a couple of filled tanks in your trunk would not cause any anxiety at all. But you know all this already.

The decrease of pressure might be an issue, hopefully not too dramatic - I wouldn't know.

Air compressors and air driven motors aren't exactly the most efficient machines on the planet. It doesn't make sense to me.

Is that an argument? Aren't exactly the most efficient machine on the planet?

It runs on air, that's very efficient in my book, no matter the actual efficiency %.

"The O2 Pursuit gets 62 miles of travel on a full tank, and can hit a top speed of 87 mph."
-Wired

How can this not be impressive on a prototype, talk about potential. And coming from something as accessible as a vanilla scuba tank?

Problem with air is it has a horrible energy density. A regular scuba tank carries something like 300-400wh (if released very slowly) with horrible recharging efficiency. They will pretty much stay in the novelty category for the simple physics involved.

Given the simple physics involved it has potentials to being a low-cost alternative to electric bikes, simple physics is a selling point to the e-bikes, why hold it against an air-bike?

 I can see potentials on dirt-tracks where the fuel/battery is great recharging efficiency relative to price and would require very little infrastructure installment.
Since Zero dropped the XU there is a market for a low-cost commuter and given it runs on scuba tanks and not batteries, low-cost is not just in terms on maintenance but also off the shelf.

Having all this said, I'm hope I don't sound harsh or give the impressions of being a total .... . If that is the case I'll pull the 'lost in translation' card and blame English being my second language.
I respect you all on this forums for your knowledge and interest in e-bikes, also I haven't had my second cup of coffee yet and might be a little grumpy. (I'll go have my coffee now)

Omg it's beautiful!
*droolz a little on the keyboard*

Just want to add that there is a "MMX" model in the press galleries. A somewhat stripped FX with knobbies, chain drive and low-tech dashboard. It's not presented in motorcycles tab and from what I've seen it's not even mentioned anywhere.

Look at the press images - the MMX specifically, a stripped FX with knobbies and chain drive.
http://www.zeromotorcycles.com/press/

Image: http://media.zeromotorcycles.com/press-2014/small/mmx/studio/2014_zero-mmx_studio_lp-wbg_1680x1200_press.jpg

Are they really missing, or not just updated this year? I recon they will be revamped for 2015 instead. I think both MX and XU makes sense in the model program.