Rock bouncing/crawling with tubes, Quick question??

Sure there is been a thread about this, Tried searching and got frustrated, need to know kind of quick as i'm about to pull the trigger and order some tubes so they can be here quick. But I was wondering,
1. Anyone with experience with tubes in tires have any issues at low psi's and hi wheel speed on tha rocks?
2. How the hell do you figure the size you need with all of the weird numbers, i'm lost ???
Have some 44's And 2 definitely need tubes, Wanting to sell or trade them but I can't stand to see them sit there, so I'm trying to figure out which tubes and order some so they can be here asap. Thank you for any info!
Also 15" wheel, i forgot to mention
Thanks!

19.8-21.6x16 metal valve stem

Awesome brother thank you so much!!

That size work for 42 on a 15 rim?

Eddyj said:

That size work for 42 on a 15 rim?

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should work fine I've heard both ways but best to run baby powder so the tube can slide into place without pinching

I had some in a set of 44 boggers and got some in a set of 42s on my chaindrive

I've had a set in 44 boggers and got a set in 42s on my chain drive and they work good

Double post whoops

Hate to sound like a newb but does this help keep the bead seated like inner air locks?

Hell naw I don't think so, for me it saving me about $600 a tire. Haha not really I bought a set of 44 from a douche bag off craigslist , he was old piece of **** con artist that said they all held air. Two of them have pretty big cuts , so Run a tube instead of trying to locate someone to vulcanize .. Also thank you for the picture with the numbers. I had one tube but the numbers wore off. That looks exactly like mine is that a Carlise?

kushKrawlin said:

Hell naw I don't think so, for me it saving me about $600 a tire. Haha not really I bought a set of 44 from a douche bag off craigslist , he was old piece of **** con artist that said they all held air. Two of them have pretty big cuts , so Run a tube instead of trying to locate someone to vulcanize .. Also thank you for the picture with the numbers. I had one tube but the numbers wore off. That looks exactly like mine is that a Carlise?

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Make sure to at least patch them to keep the trash out. A small rock can get in there and only way to fix a tubed tire that leaks is to pull tube.

Ahhh! Never thought bout that. Good looking out. Thanks!!!