1FastZ

What the biggest tire you can run on an 8 inch rim? I bought some 18X8's and need to know what size tire would fill up the rear wheel well. The car is stock height.

Would a 245/40/18 be good for the front?

1FastZ

23 views and no one can answer. I know there's someone out there that knows.

'86 350

Well technically you can go pretty damn big on an 8" rim. I've seen people run 275's on 7" rims, so I don't see 295's or 315's being exactly out of reach for an 8". Granted that would only be good for striaght line, horrible for handling.

On my 17 x 8 Snypers I run a 245/45/17 up front. 245 and maybe 255 seems to be a good, popular size for an 8" rim.

matt_p

255's will fit well.

fmacon1992

I would go with 255/40

Stevo

iTrader: (45)

I would not go with a 255/40 i would stay with a 245/45 on a 8" rim. Why? Because thats what i choose for my 8" snypers and i dont like how it looks. Its too skinny and thats cause it is, at only 25" tall...stock size is 25.7" tall.

I have a 9" rim on the back being a 285/40 and thats 26" tall and its huge and it doesnt handle well. I screwed up tire sizes on both rims.

Fit the tire to the rim.

GodSpeedGTA

iTrader: (1)

ahaha 295s are you serious...there is a point where it becomes impossible...i work at discount tire co and i mounted 275 40 18s for my older brother on 18x8 inch wide wheels and it was A BIATCH...he DEF couldnt go any wider...it would tear the bead...it took four guys including myself to get those 275s on

DO NOT try to go any bigger than a 275 or youll be paying BIG bucks to get them mounted...it took nearly 45 min to get the 275s mounted and aired up...bc getting the bead to seat is a entire new story of annoyance

stick with 255 to 265 at the abs max...it you want over 285 get atleast a 9" wide rim...better if its 10"
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btw here is the most common and BEST recommendation for doing what you want...go 245 40 18 up front and 275 35 18 out back...it will work and they are nearly identical in every way except sidewall height to the stock setup

almost identical diameter and everything...have fun getting those 275s on tho

Stevo

iTrader: (45)

lol that does sound pretty dumb...it was hard by myself mounting all 4 of my OVERSIZED tires...2 pry bars and lots of words from my mouth and its done. Whats funny is that the shop i was using there machine at just got a new one with the arm to push down on the other side of the tire for ya. Makes changing any tires a PIECE OF CAKE.

VincentZ28

iTrader: (2)

I say get rid of the 18x8's and go 18x9.5 all 4 corners like I did with 275/35/18front and 285/35/18rear. Or go with 18x9 or 9.5 front and 18x10rear.

GodSpeedGTA

iTrader: (1)

yeah we had to use 4 pry bars to get my bros 275s on it was ridiculous...and then we had to get a big fat dude to bounce on the tire until it finally began seating...it was ridiculous...god i hope he nv has a flat

however i should mention he had runflat tires...which was most of the reason for their stubborness to seat but it would still be difficult to mount them if theyre not run flats

Red92RS

I would not put anything bigger than a 255 tire because the side wall should sit flat like this " |_|" and any wider would sit like this " /__\ " , If you put on a bigger tire than the rim requires you put alot more stress on the sidewalls of the tires and this can become dangerous at low pressures( If you happen to puncture tire with nail etc.) which will be more likely to damage the tire. If any company is willing to mount a tire too wide for the rim than they are more than likely not following the manufacturers recommendations(which are pretty strict with most national brands), and just want to make more money selling a more expensive tire.

GodSpeedGTA

iTrader: (1)

technically thats not all true...why do tahoes and trucks come with 265 70 16 tires on 7" wide rims...the tires do sit like you say however its not "dangerous" unless you like driving on flat tires...the reason thats somewhat dangerous (in which case it would be NO MATTER HOW straight the sidewall sits) is because if it goes flat and you drive on it it will basically ride on the rim with the tire wedged btw it and the road and rub the sidewall so thin that it will just shread to pieces...ive seen it a thousand times...its call run flat or a run flat ring...it basically burns a ring around the inside sidewall of the tire and DOES RUIN THE TIRE IF IT doesnt blow it out...but thats because some people dont look at their tires before they go somewhere...or cant notice when they look low...i mean how hard is it to tell?

i dont know about all tire shops, but at Discount Tire we dont sell anything that we know is gonna be a problem...bc it if is a problem then its our asses...we test fit everything we put on, refuse to work on anything w/spacers, and if something rubs or doesnt work we tell the customer what needs to be done to fix it or go to a smaller size

ZZ4 86 Z28

iTrader: (1)

its easier to fit a wider tire on a narrower rim when you have a bigger sidewall. like putting a 275/60/15 on a 15x7 isnt that hard, compared to putting a 275 on an 18x7, forget about it.

Brisk

iTrader: (25)

I know the guys at the shop had a hell of a time putting my 275/40's onto a 17x10 rim..

'86 350

Yeah, actually I'm dead serious. It's gonna be different on an 18" rim, but that don't mean ****. We had a guy come into our shop wanting to mount some ET streets to a 15 x 7 rim. The streets were 275/60/15 I believe. They went on fine. They were wide for sure, but for striaght line, they work absolutely fine.

On my 17 x 9 rims, I didn't find it all that hard to mount 275's on either.....

Stevo

iTrader: (45)

Yes that also i forgot to add. Smaller sidewall obviously are harder to get on no matter what the size. The 60 series tires are not hard to get on no matter the size really. We should be talking about 30 and 40 series tires here.

back in black

Now that were on the topic I'm having a heck of a time deciding the following.Currently I have 245/50-16 on my 86 iroc rims.Pretty tall side wall(I think)I just ordered replica 18"x8 Irocs and am waffling between 245/40-245-35 or 255/40 or 255/35.I want to stay the same size on all 4.I'm thinkin the 35's will make it look like there's too much rim and not enough tire,so I'm leaning to the 45 but not sure on the 245 or 255(I know alot of this is personal prefence look as well.I also live in a small town with alot of little pot holes>whatcha think!

GodSpeedGTA

iTrader: (1)

o so that dont mean **** when your mounting 295 35 18 on a 7" wide rim??? ...were not talking a 60 ratio here as others have already told you were talking 40 MAX...no crap its gonna be easier with MT streets

" I don't see 295's or 315's being exactly out of reach for an 8. " UM yes for a street application on a car i dont think he wants 315 70 18 and id love to see you mount a 315 30 18 on a 8" wide rim in your shop...id pay you about a thousand dollars to see that

'86 350

Read his original question tard. Here it is again for you:

He asked the biggest tire he could mount on an 8" rim. Not, "whats the biggest tire with a 40 series sidewall I could mount?" or anyhting like that. I answered his question, but then went on to tell him the more economical choise would be 245/40 or 255/40

Your right, 315/30/18 couldn't be done..... congradulations first thing you've been right about so far. I didn't say that though. I just said for striaght line and strip combos it's perfectly acceptable and possible to do. I've seen 295/50 or 295/60 mounted on an 8" rim plenty of times. Nice try though cupcake.

ZZ4 86 Z28

iTrader: (1)

theres no need for this. it was obviously a misunderstanding with all the people posting.

GodSpeedGTA

iTrader: (1)

congraTulations you obviously won the argument here and i am so inferior to your miniscule mind power...lets post all of his quote next time and its clear to see hes not talking about DRAG tires...btw i never said anything in the first place to **** you off i just said haha 295 are you serious (bc as YOU even said the idea the way you put it is ridiculous unless you are talking to someone about drag tires)...where did i take a shot at you tard? fact is i didnt but you got all butthurt about it and thats fine...ive got way better things to do then waste my time with someone like you

post a reply if youd like im not reading anymore of your "witty" remarks

THX FOR STRAIGHTENING ME OUT ON THAT
sorry to the poster of the thread it wont be hijacked any longer

'86 350

He asked 2 questions. I answered the first one (what's the biggest tire I could fit on an 8" rim?) and I answered the second one as well, saying that 245/45 or 245/40 would be fine.


Yeah..... your right. I did win.

1FastZ

Thanks for the reply's guys. I went with a 255/45/18 on the rear and a 245/40/18 on the front. The 255/45/18 was to big for the front but it looks just right on the rear. All in all I'm very happy with the new look, much better than the chrome 16 inch irocs I had.