Ok doin a lift on my 01 blazer 2.5" rc so what im gettin at is after that lift at some eagle alloy series 058 15x7,+2 offset,4.00" backspacing i want to a 31x10.50 but ive been told to run 265/75 or 265/70 i want wide,all-terrain,rough look but dont want to have to cut,bend,etc. to fit it in but also i kinda want to fill the space but if it was to flex,turn,etc i dont want rubbing...i have the flat faced stock 4x4 wheels and this whole offset and backspacin thing confuses me, been told they were the same but from what i have seen they are not,maybe affect each other but not the same PLZ HELP!!! Im tired of drivin stock stuff thabks ahead of.time

 

With the wheels you want you'll be restricted to about a 29" tall tire because of the offset. A 31 will fit with occasional rubbing on the stock wheels with a 2.5" lift.

 

Ok thats hight covered i guessed....like i said i webt to a wheel place here in town they looked up told me that stock offset was +32 to +35 on the factory wheel so....And showed th eagle wheels sayin that the +2 offset would.keep from puttin alot of weight on parts that didnt need like axles,othe suspension parts etc.....gees im just ready to get.my lift done and get some wheels where i.can run 31x10,50s or 265/75 or 265/70 i.mean gees with all that other crap.hell its gonna make the thing look like ****....sorry just been tryin to figure all this out for.several months now just seems to be gettin no where i get a tire.height no width or i get a tire size nut.nothin.about offset or backspacing i appreciate all the info though its.just bein a pita...maybe if some one thats has the 2.5" lift what wheels an tires their runnin that would help

 

Ok i may drop down to a 30x 9.50 15 BF Goodrich A/T T/A KO any ideas that if that will work..being as the overall diameter is about 29.5"...and also anyone know where i can get a link to a calculator to tell like speedometer difference of what i have now and the 30x9.50's

 

this is a good comparison calculator

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

 

This doesnt let me compare standard size like 30x9.50 or 31's

 

it shows the overall height and width of the tire, play around with the sizes till those numbers match what you want.

a 30x9.5 should measure about 29.7 tall and 9.5 wide, 31 will be about 30.7

 

This is the tire calculator I like to use. It had both metric and standard tire sizes and also tells you the difference in your speedometer.

 

i know the inches and all width and everything what im wanting to know is if im runnin 235 70 15 no and i put a 2.5" lift with 15x7, +2 offset, 4" backspacing then put 30x9.50x15s on there the speedometer will be off im wonderin how much it will be off im....im having so much trouble finding info out on doin this so called build,its all stock 01 blazer now i just need to know if all this stuff will work just kinda hate to spend all that money and then it not work i really wanted a 31x10.50 but will settle at a 30x9.50 because the same tire i want is offered in both sizes so plz some one help there has to be someone out there that knows somethin about all this.

the pictures i have posted: the wheels are the ones i want to get and the lift kit is the one im putting on my truck and the white blazer is not mine but is close to what i want and the tire is what i want to run in a 30x9.50 i really want 31x10.50 but everybody tells me it will rub if it matter i have the higher payload suspension from gm the rpo code is Z85 and so any info will be nice

 

The link I posted tells you the speedometer difference. Input 235/70/15 and 235/80/15. It says the speedometer will be off by 6.5" (reads 60 mph, actually travelling 63.9)

Going from stock wheels to 4" backspacing will make them stick out 2" further each side.

As for if they will fit well on your truck, read more threads, see what others have done. You need to do more research.