Weight of Rocket Wheels "Launcher" 15x4.5"

Anyone know the weight of these wheels? Without tire if possible.
Rocket "Launcher" 15"x4.5"
Checked their website and no luck.
Also checked a couple of venders that sell the wheel but still nothing.

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Really? Nobody?
If it's easier to give the weight with the tires I'm good with that but it will help me if you tell me the brand name of the tire and it's size.
Thanks

 

I called the manufacturer

15x4.5 = 14.25 lbs

FYI