Will it work or not???

Should be ok.
Follow the Mfg.'s instructions, usually only +/- 1" tread Vs. wheels widths.

I knew that, if that is the case then it wouldnt be ok then, 10 inches of tread width and only 8 inches of wheel. I just didnt know if anyone has tried it to see if the 10.5 was better than the 9 inch tire on the 8 inch wheel...

I have seen vehicles have alot of wall 'walk' (aka wiggle) when launching. BE CAREFUL.

Ten inch slick will work on an 8 inch rim, but as said, you'll have to run enough air pressure to prevent sidewall flexing at the big end.

Also, with a smaller width rim than tire tread width, the slick will grow in diameter considerably, moreso than if slick was mounted on a 10 inch rim.

It will probably end up "crowning" in the middle from being tight on the rim, and you'll lose contact patch, you may be better with a 9" tire. I know guys running 9's on a 9" tire easily, are you having traction problems of some kind?

It will probably end up "crowning" in the middle from being tight on the rim, That's the term I was trying to remember - "crowning" Thanks, Sean!

I have a 12.5" tire on an 8" wheel. Zero problems.

Jim

10.5 x 28 - 15's work fine on an 8" rim at 13-16 psi depending on your chassis, weight, power level etc.