does anyone acctually know what the mass lift law is?

[2000Cherokee]

i have been searching on this site and other jeep sites trying to figure out what the lift law is in massachusetts..


i have heard about the equasion, 2 inches above stock, 29 inches to the bottom of the door, and 26 inches to the bottom of the door..

does anyone know which one it is? im trying to figure out how much lift i can go and still not have problems getting inspected..

i have heard that when you use the equasion with an xj you com out to 3 inches of lift plus the 3 inches in tire size. i have heard you can combine those two and get 6 inches and that is the amount of lift allowed. now can i just put smaller tires on and still have 6 inches of lift when i roll into the inspection station?

 

[93XJ-79CJ]

540 CMR 6.00

http://www.lawlib.state.ma.us/500-599cmr.html

that links to:

http://www.truckworld.com/How-To-Tech/97-lift-laws/MA_lift_law.pdf

 

[2000Cherokee]

now with that formula i came up with 2.67 which i am going to round up to 3 inches just to be simple. then according to that i can go up 3 inches in tire size so now i am at 6 inches plus the 1 inch extra allowed.. now in theory could i dive around with a 6 inch lift and be legal?

now if i go into get the inspection station with a 5.5 inch lift on my jeep with stock tires would it pass? since i am allowed around 7 inches total lift between machanical and tire but i wont have my trail tires on.

 

[StuckXJ]

Who voted for this stupid law. Grrrrr

 

[Moto]

a 3 inch increase in tire size does not equal 3 inches in height. You have to figure that a tire is round and that if you get a 3 inch taller tire only 1.5" of that is actually going to be on the ground with the other 1.5" being on top half. So for every inch you increase in tire size you only actually gain 1/2".

 

[TekkaMaki]

Don't forget that the X amount of lift from the formula is in addition to the highest suspension and largest tires size available as an option for your particular vehicle...in this case the Up Country package would add another inch or so to your total, but like Moto said you can't add the 3" from the tire increase like you did.

Really it comes down to finding a friendly place to get inspected...I've had a station hassle me over my 3" lift before, and I've had a guy say that he has a lifted truck too so as long as I tell any cops that I put the lift on after I got inspected then it's fine by him...if it comes down to you having to break out the formula on a station owner then you've probably already lost the bet.

Here's the math I did on my XJ:

<Measurements from XJ with 31x10.50 TrXus on 15x7 rims with 4.5" BS on stock XJ axles>

(w/b x w/t) / 2200 = Lift

(101 x 60) / 2200 = Lift

6060 / 2200 = 2.76"

This is the height allowed over the biggest available options for that model + year vehicle. The Up Country XJ had springs ~1" over stock with tires size 225/75R15 = 28.3" and was available through at least '99.

Maximum tire size = 28.3" + 2.76" = 31.06"

Maximum lift = 2.76" + 1" (Up Country) + 1" (allowed overage) = 4.76" over stock

When they say "all fractions shall be excluded" I don't know if tha means that fractions should be dropped (making it 4") or rounded (making it 5")

 

[jeepgod]

The currrent law for inspection is 2" up or down including tire size!

now everbody can tell me i am wrong! but I am not, just got the current inspection book.

 

[2000Cherokee]

do you guys think that ill get alot of hassle from a 4 inch lift, if i go for inspection with stock tires?

 

[aduke]

my buddys gmc just passed with 6" susp. and 3 body! no cat just a flowmaster!!!!

 

[Eagle]

now with that formula i came up with 2.67 which i am going to round up to 3 inches just to be simple. then according to that i can go up 3 inches in tire size so now i am at 6 inches plus the 1 inch extra allowed.. now in theory could i dive around with a 6 inch lift and be legal?

No.

The law is divided into two parts. You're allowed no more than the formula for mechanical lift, and then you're allowed to run larger tires. And the way I read it you don't get to round up both numbers and then add on an inch beyond that.

And as Moto pointed out, the tire number is based on the outside diameter of the largest available OEM tire. That was a 225/75R15 (or 225/70R16) tire. Looking through a Cooper tire brochure I have here, the 225/75R15s seem to be about 28.20" OD. So add the 2.67" and you get a maximum allowable tire size of 30.87". That'll basically allow you to run 31s, which mostly have a real OD of around 30.4" to 30.6".

Since half the tire diameter is above the axle and doesn't contribute to lift, your maximum lift is actually 2.67 + 1.33 = 4". Your starting point would be a stock XJ with 225/75R15s and Up Country suspension. If you need to know what the door bottom measurement is on one, I have one sitting in the garage, bone stock on the original tires, that I can meausre for you.

now if i go into get the inspection station with a 5.5 inch lift on my jeep with stock tires would it pass? since i am allowed around 7 inches total lift between machanical and tire but i wont have my trail tires on.[/QUOTE]