will 275 fit on a 9in wide rim

Discussion in 'Wheels & Tires' started by chihawks35, Mar 16, 2013.

  1. chihawks35

    chihawks35 New Member

    im basically putting some pieces together and i see on these tires that the recommend a skinnier wheel but i want to put http://us.coopertire.com/Tires/Light-Truck/DISCOVERER-S-T-MAXX.aspx in 275/70/18 on these wheels

    http://www.tirerack.com/wheels/Whee...lse&filterNew=All&filterWeight=All&sort=Brand

    anyone have any input im kind of stuck and dont want to go through the hassle of ordering wheels and tires from different sites to find out they dont fit

    thanks
  2. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    Here are the Specs, on a 275/70/18....below under the Rim Size, this size tire will fit Rims that are at a min of 7.5in"s in width and to up a max of 10.5in" Rim Width.

    [TABLE="class: withlines, align: center"]
    [TR]
    [TH]Tire size[/TH]
    [TD="align: center"]275/70-18[/TD]
    [/TR]
    [TR]
    [TH]Section width[/TH]
    [TD="align: center"]275 mm (10.8'')[/TD]
    [TD="align: center"][/TD]
    [/TR]
    [TR]
    [TH]Sidewall[/TH]
    [TD="align: center"]193 mm (7.6'')[/TD]
    [TD="align: center"][/TD]
    [/TR]
    [TR]
    [TH]Tire Diameter[/TH]
    [TD="align: center"]843 mm (33.2'')[/TD]
    [TD="align: center"].[/TD]
    [/TR]
    [TR]
    [TH]Rim Sizes[/TH]
    [TD="align: center"]18x7.5 to 18x10.5[/TD]
    [/TR]
    [/TABLE]
  3. chihawks35

    chihawks35 New Member

    ok yea on the cooper website it says they recommend 8.5 max thats why im kind of concerned just want to make sure theres no un even wear or any negatives to it, thanks for the input
  4. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    I'm running 275/55/20 tires, on 20/8.5in" Factory Alloy Rims, the tires have a Section Width 10.8in"s, same as the 275/70/18's.....and I've had no Issues or Problems with this setup.
    Last edited: Mar 17, 2013
  5. chihawks35

    chihawks35 New Member

    ok sounds like it will work, i finally found a wheel i like and a tire i like thats affordable. lot of work trying to get a good match thanks for the reply
  6. 99'HEARTBEAT

    99'HEARTBEAT Moderator


    I would also mention.......if you Install a Larger Overall Diameter Tire, then what you have on your Truck Now......Keep in Mind, your Trucks Computer Calculates your Trucks Speed based on the Diameter of the Stock Tires. by installing Taller or Shorter Tires, the Trucks Computer doesn’t know how Fast the Truck is going. As a Result, the Automatic Transmission may Not Shift Correctly and the Speedometer Readings will Not be Accurate(as required by law)......and You Should and/or Need to have your Trucks Computer reprogrammed for this Change in Tire(Overall Diameter)Size.
    Last edited: Mar 17, 2013
  7. chihawks35

    chihawks35 New Member

    well im running 32 in 265/70/17 now so you think that jump would still really effect that?
  8. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    Here are the Specs on the 265/70/17's....and the 275/7018's,

    [TABLE="class: withlines, align: center"]
    [TR]
    [TH]Tire size[/TH]
    [TD="align: center"]265/70-17[/TD]
    [TD="align: center"]275/70-18[/TD]
    [/TR]
    [TR]
    [TH]Section width[/TH]
    [TD="align: center"]265 mm (10.4'')[/TD]
    [TD="align: center"]275 mm (10.8'')[/TD]
    [/TR]
    [TR]
    [TH]Sidewall[/TH]
    [TD="align: center"]186 mm (7.3'')[/TD]
    [TD="align: center"]193 mm (7.6'')[/TD]
    [/TR]
    [TR]
    [TH]Tire diameter[/TH]
    [TD="align: center"]804 mm (31.7'')[/TD]
    [TD="align: center"]843 mm (33.2'')
    39 mm (4.9%) taller.[/TD]
    [/TR]
    [TR]
    [TH]Rim sizes[/TH]
    [TD="align: center"]17x7.5 to 17x10[/TD]
    [TD="align: center"]18x7.5 to 18x10.5[/TD]
    [/TR]
    [TR]
    [TH]Circumference[/TH]
    [TD="align: center"]2525 mm (99.4'')[/TD]
    [TD="align: center"]2647 mm (104.2'')[/TD]
    [/TR]
    [TR]
    [TH]Revs per mile[/TH]
    [TD="align: center"]637.5[/TD]
    [TD="align: center"]608[/TD]
    [/TR]
    [TR]
    [TH]Speedometer[/TH]
    [TD]Assuming that this is OEM tire and speedometer readings are correct >>>[/TD]
    [TD]When Speedometer reads 60mph (96.6km/h) actual speed will be 62.9mph (101.3km/h): 4.8% faster.[/TD]
    [/TR]
    [/TABLE]



    The below site, is where I received the Specs on these 2-Tire Size's, its a Great Site!!!,
    http/wwwrimsntires.com/specs.jsp
    Last edited: Mar 18, 2013
  9. chihawks35

    chihawks35 New Member

    damn that is really helpful. thanks i appreciate it. see and im not much of a car minded person so i wouldnt really think that adding an inch would change my speed almost 3mph. im assuming that can do some major damage to a tranny.

    - - - Updated - - -

    where would you recommend i go to get it re-programmed? a dealership? also any idea ballpark the cost on that?
  10. TRPLXL2

    TRPLXL2 New Member

    The speedometer wouldn't really bug me that bad, BUT Mike's right about the shift points. You will know if it starts up and down shifting going up hills more then it used to, to me 33" tires are borderline depending on your gear ratio. Congrats on your choice, they look real nice!!

    You'll get a long time out of the tranny depending how you drive, my boyfriend had 33"s on his Colorado and he ran it with 3.42 gears and a 5 cylinder. It constantly downshifted, and was annoying as hell but he kept driving it. The 4l60e held up fine, but after about 50,000 miles of this the 3 and 4 clutches finally wore out and were in need of replacement.
  11. chihawks35

    chihawks35 New Member

    yeah i could deal with spedo being off but if my transmission is all out of whack thats cause for concern.
  12. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    Next to the Dealership's, most auto repair shop could do the re-programming, also asked your friends, if they have a Scanner, that is capable of doing this.....also HyperTech sell a Trouble Code Reader, to Check the Service Engine Light, that also has the feature of being able to do the re-programming for a change in tire size, on the Cost, it all depends on who does it???

    Last edited: Mar 16, 2013
  13. TRPLXL2

    TRPLXL2 New Member

    I had a 2005 1500HD crew cab 4x4 lifted 6" with 35" tires 305/65/18, 4.10 gears, 5.3, 4l60e.

    I only had the truck for 10,000 before I got it repoed, and it downshifted like a mofo too. What I did to save on the transmission was speed up to help make it up the hills, but sometimes it would drop to 2nd gear and would run about 3,000 rpms to the top of the hill and then it would shift up. I personally still run larger tires on all my trucks, It's a touchy subject as many disagree.

    I should also add your cruise control won't work right either, like mike said the VSS sends pulses to the ecm. If you have cruise on say 65mph, and you hit a hill you'll get a nice surprise. My truck scared the hell out of me in cruise control, I hit a hill and next thing I know 5,000rpms out of nowhere and then it downshifted. After that I never used cruise again lol!!
  14. chihawks35

    chihawks35 New Member

    yeah except im anal and knowing that its off a little il probably get it adjusted id just need to find a place near me that would even do that.

    - - - Updated - - -

    alright im going to check around to see if anyone has one thanks for the input i appreciate it

    - - - Updated - - -


    yeah that just scares me. im definitely going to get it programmed when i do it

    - - - Updated - - -

    the next issue is, will this void my after market easy care warranty.... which is the reason im not lifting my truck right now to avoid voiding the warranty.
  15. chihawks35

    chihawks35 New Member

    i emailed cooper tire to see if it would fit and they said no, and reccomended me other tires. which are less than 33 in
  16. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    What Year is your Vehicle, is it a 2WD or 4WD and if its a 4WD, does it have Leveling and/or Lift Kit installed on it??
  17. chihawks35

    chihawks35 New Member

    i have a 2007 new body silvy 1500 with z71 i have a 2 in RC leveling kit. 4wd. i called the local tuffy to see what they though and two mechanics there dont seem to think it will make negative difference.

    also pertaining to backspacing and bolt pattern, should i just go with my stock or since im going wider to i want a bigger off set
  18. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    Your running 17in" Stock/Factory Rims, IIRC they have a Width of.....7.5ins"........here are the Specs on the Rim/Tire setup you have now on your 07" and your Factory Rims with the 275/70/17's


    [TABLE="class: withlines, align: center"]
    [TR]
    [TD="align: center"]Wheels:[/TD]
    [TH]Wheel 1[/TH]
    [TH]Wheel 2[/TH]
    [/TR]
    [TR]
    [TH]Wheel size[/TH]
    [TD="align: center"]17x7.5 ET 31[/TD]
    [TD="align: center"]17x7.5 ET 31[/TD]
    [/TR]
    [TR]
    [TH]BackSpace[/TH]
    [TD="align: center"]139 mm (5.5'')[/TD]
    [TD="align: center"]139 mm (5.5'')[/TD]
    [/TR]
    [TR]
    [TH]Typical Weight[/TH]
    [TD="align: center"]~ 22 lbs / 10 kg[/TD]
    [TD="align: center"]~ 22 lbs / 10 kg[/TD]
    [/TR]
    [TR]
    [TD="align: center"]Tires:[/TD]
    [TH="width: 40%"]Tire 1[/TH]
    [TH="width: 40%"]Tire 2[/TH]
    [/TR]
    [TR]
    [TH]Tire size[/TH]
    [TD="align: center"]265/70-17[/TD]
    [TD="align: center"]275/70-17[/TD]
    [/TR]
    [TR]
    [TH]Section width[/TH]
    [TD="align: center"]265 mm (10.4'')[/TD]
    [TD="align: center"]275 mm (10.8'')[/TD]
    [/TR]
    [TR]
    [TH]Sidewall[/TH]
    [TD="align: center"]186 mm (7.3'')[/TD]
    [TD="align: center"]193 mm (7.6'')[/TD]
    [/TR]
    [TR]
    [TH]Tire diameter[/TH]
    [TD="align: center"]804 mm (31.7'')
    [/TD]
    [TD="align: center"]818 mm (32.2'')
    14 mm (1.7%) taller.
    [/TD]
    [/TR]
    [TR]
    [TH]Rim sizes[/TH]
    [TD="align: center"]17x7.5 to 17x10
    [/TD]
    [TD="align: center"]17x7.5 to 17x10.5[/TD]
    [/TR]
    [TR]
    [TH]Circumference[/TH]
    [TD="align: center"]2525 mm (99.4'')[/TD]
    [TD="align: center"]2569 mm (101.1'')[/TD]
    [/TR]
    [TR]
    [TH]Revs per mile[/TH]
    [TD="align: center"]637.5[/TD]
    [TD="align: center"]626.6[/TD]
    [/TR]
    [TR]
    [TH]Speedometer[/TH]
    [TD]Assuming that this is OEM tire and speedometer readings are correct >>>[/TD]
    [TD]When speedometer reads 60mph (96.6km/h) actual speed will be 61mph (98.2km/h): 1.7% faster.[/TD]
    [/TR]
    [TR]
    [TH]Typical Weight[/TH]
    [TD="align: center"]~ 47 lbs / 21 kg[/TD]
    [TD="align: center"]~ 49 lbs / 22 kg[/TD]
    [/TR]
    [TR]
    [TH]Wheel+Tire Weight[/TH]
    [TD="align: center"]~ 69 lbs / 31 kg[/TD]
    [TD="align: center"]~ 71 lbs / 32 kg[/TD]
    [/TR]
    [TR]
    [TD="width: 20%, align: center"]Clearance:[/TD]
    [TH="width: 40%"]Package 1[/TH]
    [TH="width: 40%"]Package 2[/TH]
    [/TR]
    [TR]
    [TH]Suspension[/TH]
    [TD]Assuming that this is OEM wheel/tire and there is no any problems with clearance on both sides >>>[/TD]
    [TD]Package is 5 mm (0.2'') closer to suspension/brakes components. Acceptable for most cars.[/TD]
    [/TR]
    [TR]
    [TH][/TH]
    [TD][/TD]
    [/TR]
    [/TABLE]

    IMO.....They...."the 275/70 with your....17in" Factory Rims, Will work.......I'm not a 4wd guy, so hopefully, the member's with 4wd, can either Confirm or Correct me on this.....
    :neutral:.....also its up to you, as to weather you want to stay with your Factory 17in" Rims, or go with 18in" rims, as you mentioned in a earlier post.


    Edit:.....Sorry, do you have Factory 17in" or 18in Rims??
  19. chihawks35

    chihawks35 New Member


    i have stock 17 and am looking to move up to 18x9 so the left column is stock backspacing so i could use that for that website plug those numbers in and it will give me the correct size i should need
  20. 99'HEARTBEAT

    99'HEARTBEAT Moderator

    The Specs on both sides.....is for the Factory Rims 17in" by 7.5in in Width, with a Factory Offset of.....+31mm....which gives them a....5.5in" Backspace.

Share This Page