Bigger tires question
JK Enthusiast
Joined: Mar 2009
Posts: 126
Likes: 1
From: The Free State
Wait.....I thought 285s WERE 33" tires? Was I wrong to assume that? The 285s are larger in diameter than the stock rubi tires, and the 265s are smaller in diameter, correct? So which is a better fit for a stock rubi? I don't want to go to a smaller tire, or loose ground clearance.
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
JK Enthusiast
Joined: Mar 2009
Posts: 119
Likes: 0
From: SC
Wait.....I thought 285s WERE 33" tires? Was I wrong to assume that? The 285s are larger in diameter than the stock rubi tires, and the 265s are smaller in diameter, correct? So which is a better fit for a stock rubi? I don't want to go to a smaller tire, or loose ground clearance.
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
JK Jedi
Joined: Oct 2007
Posts: 4,730
Likes: 3
From: BC
Wait.....I thought 285s WERE 33" tires? Was I wrong to assume that? The 285s are larger in diameter than the stock rubi tires, and the 265s are smaller in diameter, correct? So which is a better fit for a stock rubi? I don't want to go to a smaller tire, or loose ground clearance.
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
How much power and MPG will I loose going from stock Rubi KMs to 285s? Will I gain power and MPG if I instead go to 265s?
Will I gain ground clearance going with a 285, and loose it if I go with a 265 instead? Thanks!!
285 is about 32.8 tall tire 11.2" wide.
265 is about 31.8 tall tire 10.5" wide.
You won't lose much power or MPG by sticking with 33's. You may gain MPG if the tires are lighter than the stock rubi tires.
With 33x12.5R17 Cooper STT's I lost about 1/2MPG due to extra weight of the tires over stock.
If you are not planning on any lift...go with the 285's very close to stock height but about 1" wider tire.
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
Browse through this:
https://www.jk-forum.com/forums/show...74&postcount=3
For metric sizes, don't assume the higher number = taller/wider. It's all about some ratio of width to height to rim size - not straighforward like the flotation tire sizes. Always use a metric tire size calculator - a quick search online will bring up many to choose from. (There is also a slight difference between various calculators and manufacturers listed specs...)
an example:
295/75/16 33.4 x 11.6 (what I have, actually measure out at 32" even)
295/75/17 34.4 x 11.6
305/70/16 32.8 x 12
305/70/17 33.8 x 12
325/65/18 34.6 x 12.8
325/60/18 33.4 x 12.8
255/75/17 = 32.1 x 10 with calculator
255/75/17 = 32.05 x 10.04 from BFG
And then there is the whole rim width affecting overall tire height discussion...
https://www.jk-forum.com/forums/show...74&postcount=3
For metric sizes, don't assume the higher number = taller/wider. It's all about some ratio of width to height to rim size - not straighforward like the flotation tire sizes. Always use a metric tire size calculator - a quick search online will bring up many to choose from. (There is also a slight difference between various calculators and manufacturers listed specs...)
an example:
295/75/16 33.4 x 11.6 (what I have, actually measure out at 32" even)
295/75/17 34.4 x 11.6
305/70/16 32.8 x 12
305/70/17 33.8 x 12
325/65/18 34.6 x 12.8
325/60/18 33.4 x 12.8
How wide are the stock jk rubicon tires?
255/75/17 = 32.05 x 10.04 from BFG
And then there is the whole rim width affecting overall tire height discussion...
Last edited by nthinuf; Mar 24, 2009 at 10:32 AM.