285/70R17 on 2.5inch lift

[07JeepXK]

Sal can you post close up pics of your front bumper mod? I think once I get my rear ac/heater lines deleted this week im going to have some fun with my front bumper. I want it identical to yours. What did you use to cut the bumper?

[Sal-XK]

Sal can you post close up pics of your front bumper mod? I think once I get my rear ac/heater lines deleted this week im going to have some fun with my front bumper. I want it identical to yours. What did you use to cut the bumper?

This is where most my pics are HERE Just basically used a jig and rotor saw and a razor blade to clean up the edges. I wish I could delete my rear AC lines but I use them especially when I sleep back there in the cold I use the heat. And every time I think I can loose my third row my jeep is used to transport 7 people

[07JeepXK]

Thanks! Im hoping this weekend to do the bumper mod and paint my rocker pannels that are rusting from off roading.

[Omelet]

Ok first off I know I have a WK and not an XK and I know that clearances are more stringent! Besides folding over the pinch weld and smashing the piss out of it, have you thought about using a longer bump stop to limit you up travel? Once you clear the rear of the well out, your fender while stuffing the tire will be your next concern. In the rear you can fold the lip of the fender and extend your bump stops to keep your tire from rubbing at full stuff. I know you guys have these crazy ac lines that we don't so I am not sure how those come into play. I just thought I would through some ideas out there, because I have done similar things to mine

Also, maybe I am thinking of the wrong XK, but the white one with a 2" lift that I know about had 34s (285/75 R17) I thought?

[Sal-XK]

Bump stops will work I agree but they will limit the amount of flex you have. Ideally I guess hack off as much as you can then use bump stops to stop you from hitting.

[The_War_Wagon]

Since I have no CLUE what the "285" in tire size means (nor what the "245" in my current tire size means!), can anyone who speaks American, tell me if 31x10x17's will run without rubbing or modification, with a 2" lift? If not, I'll drop to a 30x9.

BTW... the last metric thing I owned AND understood, was a S&W 1006. "Litres" are for measuring Mountain Dew, and 20 degrees Celcius in Europe still looks to me like they're freezing their ass off!

Your daily AMERICAN rant - over & out.

[Matt]

285 = the width in mm. 25.4mm per inch mean that 285/25.4= 11.22" wide.

245 mm wide = 9.64" wide

The middle number (70 in a 285/70/17) is called the aspect ratio. In laymens terms, this tells you how tall the sidewall is as a percentage of the width.

70 = 70%
70% of 285 is (about) 200. So the sidewall height is 200mm (or 200/25.4 = 7.8")

Then to figure out the diameter of the tire, you just add up sidewall+wheel size+sidewall = 7.8"+17"+7.8" = 32.6"

In conclusion, the standard translation for a 285/70/17 is 32.6x11.22

.... want to know a really EASY shortcut?

[Matt]

Shortcut:

I've combined all of the steps in that previous example for a quick and easy way to calculate the tire height of metric tires (its just algebra, nothing fancy).

For tire sizes: AAA/BB/CC here's what you do. Plug it into a calculator exactly like this:

AAA x BB / 1270 + CC = Diameter

Example: 285/70/17
285 x 70 / 1270 + 17 = 32.7 (in my previous post i used a lot of rounding, so it was a lower calculation due to all of the fractions being dropped off)

For someone who isn't familiar with standard order of mathematical operations, this is what your calculator is doing:
(285 x 70 / 1270) + 17

[cico7]

For someone who isn't familiar with standard order of mathematical operations, this is what your calculator is doing:
(285 x 70 / 1270) + 17
Please .............Excuse.......... My ...............Dear.... Aunt......... Sally
Parentheses / Exponents / Multiplication / Division / Addition / Subtraction

[criket]

HAHA, I haven't heard that Please Excuse thing since high school.