Either way, do NOT mix tire sizes on a 4WD. If you're picking up 235/75/15's make sure you get four.

Also, I mistakenly put 235/75's back on my truck when I replaced tires when stock size was 235/70. Now my speedometer is off by 3.3% according to THIS TIRE SIZE CALCULATOR so when my speedometer says 60 I'm actually going 62. Not that big of a deal to me.

Heck with 225/75/15's on there now your speedometer might be off as it is.

 

Yeah, I got 4- 235/75R15's given to me, and who knows the 225's might be undersized, still can't find any evidence of what exact tire size was on there, could have been 235's or 225's not sure, maybe there was 235's on it before and whoever had it before me along the line undersized them, or didn't want to spend alot of money who knows, but I got a set of 235's given to me so I will put them on this fall, there still in very good shape, they would be good for winter

 

Here are the RPO codes associated with the stock tire size:
QBF Tire, All: P235/70R15, BW
QBG Tire, All: P235/70R15, WOL
QCA Tire, All: P205/75R15, WOL
OCB Tire, All: P235/55R16, BW
QCE Tire, All: P205/75R15, BL
QEB Tire, All: P235/75R15, WOL
QJJ Tire, All: 31 Multiplied by 10.5 R15LT/C, BW
QLN Tire, All: P235/70R15, BW TL HWY

The 205's were used on 2wd trucks predominantly while the 235/70 & 235/75 were predominantly 4wd.

 

Thanks alot, thought I wrote all the codes down and went to recheck and missed QBG so it had 235/70R15 stock, and someone put different tires on, thanks so much swartlkk

 

Glad to help!