Tire Size ??
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Freshman User
Joined: May 2004
Posts: 43
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From: Iowa
Tire Size ??
I am sure this question has been asked here before but I am not haveing any luck finding an answer.
I own an '08 F-150 XLT Super Crew 4X4 with stock factory installed 255/70/17 tires. It is time to get new tires and I want something that will make this truck look like a truck. I like the Cooper STT but I want something bigger than stock. I do not plan on installing any lift and was wondering what is the biggest tire I can fit without rubbing on anything.
Can I fit a 285/75/17 ? I have stock factory rims which I plan on using with new tires.
After the tire upgrade what needs to be done to get the speedometer back to correct?
Thanks for any help I can get.
I own an '08 F-150 XLT Super Crew 4X4 with stock factory installed 255/70/17 tires. It is time to get new tires and I want something that will make this truck look like a truck. I like the Cooper STT but I want something bigger than stock. I do not plan on installing any lift and was wondering what is the biggest tire I can fit without rubbing on anything.
Can I fit a 285/75/17 ? I have stock factory rims which I plan on using with new tires.
After the tire upgrade what needs to be done to get the speedometer back to correct?
Thanks for any help I can get.
Postmaster
Joined: Jul 2010
Posts: 3,743
Likes: 2
From: Henrico, VA
Yes that tire will most likely fit. There might be some minor rubbing but nothing you should have to worry about.
You shouldn't have to do anything to speedo. The most the tire will throw it off is 2MPH and that is considered correct by many standards.
You shouldn't have to do anything to speedo. The most the tire will throw it off is 2MPH and that is considered correct by many standards.
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Freshman User
Joined: May 2004
Posts: 43
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From: Iowa
Tire Size Calculator - tire & wheel plus sizing
This site says that it will be a 5mph difference.
Can the factory computer be corrected for this change? or do I have to get a tuner to do it?
This site says that it will be a 5mph difference.
Can the factory computer be corrected for this change? or do I have to get a tuner to do it?
Freshman User
Joined: Nov 2010
Posts: 49
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Tire Size Calculator - tire & wheel plus sizing
This site says that it will be a 5mph difference.
Can the factory computer be corrected for this change? or do I have to get a tuner to do it?
This site says that it will be a 5mph difference.
Can the factory computer be corrected for this change? or do I have to get a tuner to do it?
If you have a gps device you can run the vehicle and compare the GPS speed vs the speedometer and make your corrections as needed. Just a thought.
Hotshot
Joined: Sep 2010
Posts: 10,459
Likes: 10
From: RVA
Yes it can be corrected. Some dealers will do it, some won't. Just depends on how friendly they want to be.
A handheld tuner, like Edge or SCT X3 will also allow you to adjust for tire size. In my mind though, the correction is more beneficial for the trans than the speedo. But it can be done.
Look into a tuner, with custom tunes, it's very much worth the money.
A handheld tuner, like Edge or SCT X3 will also allow you to adjust for tire size. In my mind though, the correction is more beneficial for the trans than the speedo. But it can be done.
Look into a tuner, with custom tunes, it's very much worth the money.
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Postmaster
Joined: Jan 2010
Posts: 4,329
Likes: 4
From: manchester,ct
x2 with mcdavis
the trans will be much happier after reprogramming for the bigger rubber. at least my trans liked it much better.
the trans will be much happier after reprogramming for the bigger rubber. at least my trans liked it much better.
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