• GMTNation would like to take this opportunity to wish our members & staff a very safe & Happy Holiday season!
    Thank you to everyone that keeps this site going year after year.

Going from 245/65/17 to 255/65/17 Any problems? Stock Envoy

c good

Active Member
Joined
Dec 8, 2011
Posts
374
Found a good deal on some Goodyear Wrangler Fortitude HT tires. They are 255's not 245's which were stock size on my Envoy. So they are 10mm wider and 6.5 mm taller. It's not very much but will it throw off my TCM or ECM enough to be a problem?
 

TequilaWarrior

Active Member
Joined
Dec 5, 2011
Posts
423
Location
Central Pennsylvania

Matt

Guru
Joined
Dec 2, 2011
Posts
3,820
What those guys ^^ said. I have 30.6" on mine and the speedo is off by 2mph with 3.42 gears.
 

c good

Active Member
Thread Starter
Joined
Dec 8, 2011
Posts
374
Did your MPG drop when going to the taller and wider tires?
 

gmcman

Guru
Joined
Dec 12, 2011
Posts
4,524
FWIW I tried 265/60/17 Kumho Ecsta which is not an agressive tread. I went from 270 miles per tank to 225-230, this was when gas was $4/ gal (in my area) around 2006.

After 17K miles I cut my losses and sold them, went back to the OE size Michelin.
 

c good

Active Member
Thread Starter
Joined
Dec 8, 2011
Posts
374
Thanks for the info everyone. I think I'll stay with stock size.
 

Hex313

Newbie
Joined
Apr 17, 2021
Posts
2
Location
Detroit
Very Nice! Did it affect your gas mileage from stock? Speedometer still close to actual MPH?
MPG the same avg 15.5, mainly city driving. On the high way speedo says 70 - GPS 72 much better MPG of course. 4.2i/3.73 w/lockers.
 

CODenali

Newbie
Joined
Sep 19, 2021
Posts
1
Location
Wisconsin
Looks nice! I have a 05 Envoy Denali that I just installed bilstein 1500 struts and shocks with 81069 moog rear coil springs looking at tires now. Good to know no rubbing with the 265/70/17’s
 

Attachments

  • image.jpg
    image.jpg
    994.4 KB · Views: 8

Forum Statistics

Threads
21,729
Posts
616,640
Members
15,917
Latest member
Luis1982

Staff online

Members Online

Staff online

Members Online

Top Bottom