regroovable tires

Yes you can add about 5/32nds more depth
Generally only cut the big straight grooves

 

When a tire wears out there's usually a deeper tread left on the outside edges of the tire. Most guys set their re-groove to that depth and cut the center treads. The tool is kind of like a soldering gun but instead of a wire that gets hot, there's a V shaped blade. They work great and you can usually get a few extra month out of your tires

 

That's right. But you will loose the value of the casing. It's garbage and not reusable after regrooving.

 

Usually correct. That's because after regrooving it's required that
cord material below the grooves has to have a protective covering of tread material at least 3/32nd-in. thick and there is not much way to know that without a lot of expensive equipment, so the core is essentially scrap. FMCSR 569.7

 

On a dump truck I used to haul loads for a demo company I would re grove recaps when they wer almost slick. Usually ruined th sidewall before the tred was gone. I figured if the cap had not come off before all the tread was gone it was good to re grove. I worked well.

 

I run junk china tires so the casing are crap anyways most can be grooved 1/4 inch

 

What type. Model regroover to buy.

 

so can you regroove rethread or just virgin tires?

 

I've been reading today. Looks like all tires. Just don't go too deep. Need to leave the chords covered with rubber.
I seen one guy use an all to see how deep the rubber was before he started peeling rubber.

Some say even after you regroover, the tire can be recapped.