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Posted: 9/9/2013 4:02:35 PM EST
Can someone for the love of god please answer me on putting larger tires on the same wheels. I have custom 18" on my dodge ram. Current tire size is 285/60r18. I want larger tires. I understand what the measurements stand for, just not sure which measurements are ok to increase. Just the "60" or height?
Link Posted: 9/9/2013 4:06:14 PM EST
[Last Edit: 9/9/2013 4:11:01 PM EST by CLICKBANGBANG]
Do they make a 285/75/18 or 285/80/18? Are you looking for taller, wider, or both?

The first number is width. Second is sidewall height (75% of 285mm). Third is rim size.

Increasing the first number is width. So look into a 305 or 315 for width increase.

Increasing the width to a 315, but leaving the height at 60, will still result in a taller tire (60% of 315mm).

Go taller and loose fuel mileage. There is no way around that.
Link Posted: 9/9/2013 4:06:21 PM EST
Link Posted: 9/9/2013 4:12:44 PM EST
That's one area where the American way of measuring is easier

Posted Via AR15.Com Mobile
Link Posted: 9/9/2013 4:16:59 PM EST
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Originally Posted By CLICKBANGBANG:
Do they make a 285/75/18 or 285/80/18? Are you looking for taller, wider, or both?

The first number is width. Second is sidewall height (75% of 285mm). Third is rim size.

Increasing the first number is width. So look into a 305 or 315 for width increase.

Increasing the width to a 315, but leaving the height at 60, will still result in a taller tire (60% of 315mm).

Go taller and loose fuel mileage. There is no way around that.
View Quote

Not concerned with loss of mileage. I certainly want taller, wider is a plus(just not sure if possible on the same wheels??)
Link Posted: 9/9/2013 4:19:19 PM EST
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Originally Posted By skyshark288:

Not concerned with loss of mileage. I certainly want taller, wider is a plus(just not sure if possible on the same wheels??)
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Originally Posted By skyshark288:
Originally Posted By CLICKBANGBANG:
Go taller and loose fuel mileage. There is no way around that.

Not concerned with loss of mileage. I certainly want taller, wider is a plus(just not sure if possible on the same wheels??)


What width wheel do you have? And on what truck (year, make, model)?
Link Posted: 9/9/2013 4:19:49 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By CLICKBANGBANG:
Do they make a 285/75/18 or 285/80/18? Are you looking for taller, wider, or both?

The first number is width. Second is sidewall height (75% of 285mm). Third is rim size.

Increasing the first number is width. So look into a 305 or 315 for width increase.

Increasing the width to a 315, but leaving the height at 60, will still result in a taller tire (60% of 315mm).

Go taller and loose fuel mileage. There is no way around that.
View Quote


Not necessarily true. This depends on the kind of driving he's doing and his gearing.
Taller tires are advantageous if one is doing a lot of highway miles, but it hinders acceleration and increases fuel consumption in stop and go driving.

Everything else you said is spot on.
Link Posted: 9/9/2013 4:21:50 PM EST
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The 60 is the height, it means that your sidewall is 60% of your treadwidth. A higher ratio sidewall will give you a taller tire, a wider treadwidth with the same ratio sidewall will give you a wider and taller tire. A wider tire with a smaller ratio sidewall will give you a wider tire of the same or smaller height as what you have now.
View Quote



This is the correct answer.


Also, changing the overall height of your tires will make your speedometer read slower than your actual speed. sometimes this can be reprogrammed by the car dealer with their scan tool.
Link Posted: 9/9/2013 4:22:25 PM EST
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Originally Posted By CLICKBANGBANG:


What width wheel do you have? And on what truck (year, make, model)?
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Originally Posted By CLICKBANGBANG:
Originally Posted By skyshark288:
Originally Posted By CLICKBANGBANG:
Go taller and loose fuel mileage. There is no way around that.

Not concerned with loss of mileage. I certainly want taller, wider is a plus(just not sure if possible on the same wheels??)


What width wheel do you have? And on what truck (year, make, model)?

285/60R18

2004 Dodge ram 1500 5.7 v8 4wd
Link Posted: 9/9/2013 4:23:27 PM EST
Link Posted: 9/9/2013 4:23:49 PM EST
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Originally Posted By Rick_NE:



This is the correct answer.


Also, changing the overall height of your tires will make your speedometer read slower than your actual speed. sometimes this can be reprogrammed by the car dealer with their scan tool.
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Originally Posted By Rick_NE:
The 60 is the height, it means that your sidewall is 60% of your treadwidth. A higher ratio sidewall will give you a taller tire, a wider treadwidth with the same ratio sidewall will give you a wider and taller tire. A wider tire with a smaller ratio sidewall will give you a wider tire of the same or smaller height as what you have now.



This is the correct answer.


Also, changing the overall height of your tires will make your speedometer read slower than your actual speed. sometimes this can be reprogrammed by the car dealer with their scan tool.

I understand the 60 being the height, but can I increase that and not the width? Can I even increase the width at all while using the same wheels?
Link Posted: 9/9/2013 4:24:28 PM EST
[Last Edit: 9/10/2013 6:17:24 AM EST by 23pistol23]
Easy peasy formula.

Section width x aspect ratio ÷ 1270 + wheel diameter = tire diameter in inches.

Link Posted: 9/9/2013 4:30:27 PM EST
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Originally Posted By skyshark288:

I understand the 60 being the height, but can I increase that and not the width? Can I even increase the width at all while using the same wheels?
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Originally Posted By skyshark288:
Originally Posted By Rick_NE:
The 60 is the height, it means that your sidewall is 60% of your treadwidth. A higher ratio sidewall will give you a taller tire, a wider treadwidth with the same ratio sidewall will give you a wider and taller tire. A wider tire with a smaller ratio sidewall will give you a wider tire of the same or smaller height as what you have now.



This is the correct answer.


Also, changing the overall height of your tires will make your speedometer read slower than your actual speed. sometimes this can be reprogrammed by the car dealer with their scan tool.

I understand the 60 being the height, but can I increase that and not the width? Can I even increase the width at all while using the same wheels?


Yes, you can go wider (as long as you have an 8" width). But with an oddball 18" rim, you are very limited. Not a lot of options compaired to a 16, 17, or 20". A 285/75/18 would be an inch taller, but not wider.
Link Posted: 9/9/2013 4:31:06 PM EST
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Originally Posted By skyshark288:
Go taller and loose fuel mileage. There is no way around that.
Not concerned with loss of mileage. I certainly want taller, wider is a plus(just not sure if possible on the same wheels??)
View Quote


Wider is always possible on the same wheel within reason.
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