I have 10" rear wheel, but I want it to come out just a bit more. I am already running +29mm offset and added a 5mm spacer, but want a bit more, but do NOT want to have to roll the fenders. do I go 10mm spacer, 15? 20?

 

measure it?

 

I think that it was about +22 on a 10.0 wide rim.

Probably can go to about +20 safely though.

 

so should I get a 10mm spacer or 15mm??

 

If you have 275/35/19 in the rear, I would say you can go 10mm (assuming overall offset becomes +19) safely without rubbing. 15mm is pushing it but might work. Consider that I rubbed with a 285 tire on 10.5 +23. According to offset calculator, your wheel at -15mm would extend 3mm beyond where mine was.

Camber will definitely come into play in the 15mm spacer scenario. More negative camber will be safer...

Ask a professional though, just to be sure.

 

TO be safe just get a tape measure. Looking at teh given number, I would go with 15 or 20. Yes camber will come in to play