Results 1 to 6 of 6
Thread: tires 285/70/17 vs 2265/70/17
05-06-2009, 01:32 PM #1
- Join Date
- May 2009
tires 285/70/17 vs 2265/70/17
I have a 2004 tahoe z 71 with stock 265/70/17 tires.i m thinkin of going with 285/70/17 tires.Will the MPG worsen? Will it it miss up the computor?im new to the forum.Thanks for the help.
05-06-2009, 03:03 PM #2
That change makes the overall diameter 3.3% smaller than stock. 32.7" down to 31.6" That will make the seedometer read too fast by 3.49% that means that at 60mph the speedo will read 62mph. The info I see says a change of over 3% should get the cpu reprogrammed, that isnt a very big deal but should probably be done by the dealer. Someone else on here may have more info but the numbers I quoted you are correct but I do not know DEFINITELY how much it will effect the cpu. Hope this helps, Good LuckThe diference between stupidity and genius is that genius has limits.
2007 NBS Silverado
2.5" Levelling Kit
GM Bed Liner & Tonno
Dick Cepek Rims 18X9
Hankook RF10 Tires 275/65/18
More Mods Coming
05-06-2009, 07:54 PM #3
Your speedo will read faster then what you are going by going up in size99 K1500 Suburban LT "THE BEAST"
Hypertech III, K&N, true dual
05-06-2009, 08:50 PM #4
The 285 will not fit the stock wheel properly. Its too wide but it is done all the time. The wear problems that you will see is similar to over-inflation wear(worn more in the center). It will throw your speedo off by 2-3 miles at 65-70Mph. The faster you go the more it affects it faster and the slower you go the less it actually changes. We do it all the time and have not had any problems with the CPU, but a programmer will let you change the size in the CPU and is a cheap way to do it. As for the gas mileage you will probably see a little loss. Not much.00' Chevy Z71
35's on 18's
Ranch Hand Grill Gaurd
More on the way
05-06-2009, 10:00 PM #5
Sorry about that, in the title he had a different size than what he wrote about.
05-06-2009, 10:04 PM #6
It will be the same just in reverse. It is still over the 3% that is "usually" the benchmark for recalibrating. So basically at 62 mph the speedo will read 60mph. I had 285/75/16 on my 03 silverado that replaced the stock 265/75/16s, and I gotta say I did not have any wear issues. Just saying........
By jhonydeep in forum Wheels & TiresReplies: 9Last Post: 05-03-2010, 09:03 PM
By WSD1975 in forum Wheels & TiresReplies: 24Last Post: 01-18-2010, 08:29 PM
By Dr_Zero in forum Wheels & TiresReplies: 12Last Post: 02-20-2009, 02:09 PM
By MD4x4 Fireman in forum Wheels & TiresReplies: 5Last Post: 01-03-2008, 03:01 PM
By EdPDX in forum Chevy Suburban Forum (GMC Yukon XL)Replies: 3Last Post: 12-12-2007, 07:58 AM