updated list of tire weight, lightest mx tire

 I got this on my front 34 I weighed. 

Couple offroad tires:

Goldentyre GT333 110/100-18: 11.6 lbs

Goldentyre Fatty 90/100-21: 8.9 lbs

Here are a couple I weighed last year:

Pirelli MX32 mid-soft 80/100/21 - 3900g - 8.6 lbs. This was a made in Indonesia one. I think the ones made in Brazil were lighter.

Bridgestone X31 80/100/21 - 3950g - 8.7 lbs. 

Can somebody help me understand the Fatbike MTB inner tube sizes? 

Are these all 26” diameter, but you got them in a 19/21” MX wheels??

”some light weight mountain bike tubes (fat tire tubes):
Front:
Schwalbe AV13F Fat MTB tube 26x3.0
196g (0.7mm thick)
Rear:
Vee Rubber 26A Fatbike tube 26x4.0
397g (1.0mm thick)”

Furthermore, what PSI are people using in the cycle inner tubes when fitted to MX bikes?

Dunlop Factory Spec:
80/100-21   4,150 g (9.15 lb) 
110/90-19   5,760 g (12.70 lb) 

So the factory spec tire weighs a bit more than the MX34?! 
I did not expect that. 

A few of the tires I have weights on. 
All are new with the factory label intact. Weight was averaged between two digital scales-Very slight differences. 

Hoosier 07203 IMX25 120/80-19

12.55 Lbs *this is the new stiff sidewall

Hoosier 07114 MX25F 80/100-21

8.8 Lbs

Geomax MX34 Soft 120/80-19 

12.9 Lbs

Dunlop 952F 80/100-21

8Lbs

Pirelli MX32 Mid-Soft 80/100-21 

8.5 Lbs

Tubes-

Sedona 2.75/3.00x21  1Lb 2oz

Sedona 3.25/3.50x21  1Lb 5oz

Maxxis HD 100-120x90x19 1Lb 12oz

Didn’t see Metzeler 360 listed, I’d bet they are on the heavy side.  I’m one of the few that run’s Metzeler .  I run Metzeler 360’s, on my Honda CRF250R.  They look about the same as the Metzlers we ran on Maico’s and CZ’s before electricity was invented.  I think Metzeler started making tires in the 1890’s.  Pirelli was smart to buy them, them old Germans had good technology.  Post like this are always interesting.

Any new weights ? 

Proworks 120/90-19 weight 6100 gram 😵