Actual Lift Amount - Lets Compare Fender Heights

03Cactus · **Joined:** Mon Mar 09, 2009 8:03 pm **Posts:** 49

I think this post is a great post but tire size does contribute even the way you are measuring. Let me explain.

Diameter = full size of tire from ground to top of tire (lets say 30" to make calculations easy).

Radius = from center of tire to any outside edge. (where you are beginning your measurement). For a 30" tire that would be 15" but if the tire was 32" then the radius would be 16". And being that the radius would influence the center point, as well as, fender height then by not counting tire size as well this is somewhat of a flawed comparison.

-----------------------------------------------------------------------------------

I am running a Frankenlift II Premium with 245/75/16 tires

Measurements are 23 3/4" all the way around (Just installed last week).

tommudd · **Posted:** Mon May 25, 2009 10:16 am

03Cactus wrote:

I think this post is a great post but tire size does contribute even the way you are measuring. Let me explain.

Diameter = full size of tire from ground to top of tire (lets say 30" to make calculations easy).

Radius = from center of tire to any outside edge. (where you are beginning your measurement). For a 30" tire that would be 15" but if the tire was 32" then the radius would be 16". And being that the radius would influence the center point, as well as, fender height then by not counting tire size as well this is somewhat of a flawed comparison.

-----------------------------------------------------------------------------------

I am running a Frankenlift II Premium with 245/75/16 tires

Measurements are 23 3/4" all the way around (Just installed last week).

??????? Diameter of the tire / wheel have nothing to do with this , I could take the tire/wheel off the vehicle and the measurement would still be the same . This is the only way to measure one and get a true reading without the tire / wheel combination being in it.

Oh and yours will settle an inch from where it is at least

long_tall_texan · **Posted:** Mon May 25, 2009 12:40 pm

Have to agree with Tom here. We are not measuring from the ground to the fender, or from the ground to the center of the wheel. We are measuring from the center of the wheel to the fender. That will not change no matter what size tire you have. The things that will changes are: 1. Ground to center of wheel, or fender, 2. Ground clearance for the lowest point (Rear diff), 3. Amount of space between tire and fender (bigger tire=less clearance between tire and fender)

JJsTJ · **Posted:** Mon May 25, 2009 3:16 pm

SFA - All taken w/ my normal DD load in the Jeep, sitting in my slightly inclined driveway. (I'll try to get level measurements later to compare)
RF = 27.25"
RR = 27"
LF = 27.25"
LR = 26.75"

Wifes IFS - Old Daystar lift, stock springs front, OME Med rear w/ one isolator, about 25K on it all (IIRC?) (Sitting slightly crooked in driveway, facing downhill)
RF = 21.5"
RR = 21"
LF = 21"
LR = 20.75"
(hmm....guess I better straighten her out and remeasure)

JeepBumm68 · **Posted:** Mon May 25, 2009 5:06 pm

ill post up the lift on my girls jeep. I do need to know though, what the measurement is from the flare angle to where it tapers down. I think it is like two inchs or so.

03Cactus · **Joined:** Mon Mar 09, 2009 8:03 pm **Posts:** 49

tommudd wrote:

??????? Diameter of the tire / wheel have nothing to do with this , I could take the tire/wheel off the vehicle and the measurement would still be the same . This is the only way to measure one and get a true reading without the tire / wheel combination being in it.

Oh and yours will settle an inch from where it is at least

The difference in tire size will move the center of the wheel closer to the bottom of the fender. Someone running a 30" tire with a frankenlift will show a higher # in your measurement then someone running a 32". As someone said after you, the tire fills the fender well more. It does so by having a larger radius from the center of the wheel (which moves the center of the wheel further off the ground as well).

The 32" tire will have a radius of 16" which puts the center of the tire 16" off the ground where as the 30" tire will have the center of the tire 15" off the ground. Tire size will not move the fender up proportionally with that added 1" of added clearance.

Not trying to argue just trying to help out.

I don't want to lose an inch after it settles but also looking at my CV angles am kindda hoping it does. They are pretty extreme right now.

daspes · **Posted:** Mon May 25, 2009 5:31 pm

03Cactus wrote:

tommudd wrote:

??????? Diameter of the tire / wheel have nothing to do with this , I could take the tire/wheel off the vehicle and the measurement would still be the same . This is the only way to measure one and get a true reading without the tire / wheel combination being in it.

Oh and yours will settle an inch from where it is at least

The difference in tire size will move the center of the wheel closer to the bottom of the fender. Someone running a 30" tire with a frankenlift will show a higher # in your measurement then someone running a 32". As someone said after you, the tire fills the fender well more. It does so by having a larger radius from the center of the wheel (which moves the center of the wheel further off the ground as well).

The 32" tire will have a radius of 16" which puts the center of the tire 16" off the ground where as the 30" tire will have the center of the tire 15" off the ground. Tire size will not move the fender up proportionally with that added 1" of added clearance.

Not trying to argue just trying to help out.

I don't want to lose an inch after it settles but also looking at my CV angles am kindda hoping it does. They are pretty extreme right now.

A larger tire will move the center of the wheel farther from the ground, but not the edge of the flare... It will move the edge of the tire closer to the flare but not the center.

Doesn't matter what size tire you run a 28" or a 32" both will measure the same distance from wheel center to flare on the same jeep.

tommudd · **Posted:** Mon May 25, 2009 5:43 pm

03Cactus wrote:

tommudd wrote:

??????? Diameter of the tire / wheel have nothing to do with this , I could take the tire/wheel off the vehicle and the measurement would still be the same . This is the only way to measure one and get a true reading without the tire / wheel combination being in it.

Oh and yours will settle an inch from where it is at least

The difference in tire size will move the center of the wheel closer to the bottom of the fender. Someone running a 30" tire with a frankenlift will show a higher # in your measurement then someone running a 32". As someone said after you, the tire fills the fender well more. It does so by having a larger radius from the center of the wheel (which moves the center of the wheel further off the ground as well).

The 32" tire will have a radius of 16" which puts the center of the tire 16" off the ground where as the 30" tire will have the center of the tire 15" off the ground. Tire size will not move the fender up proportionally with that added 1" of added clearance.

Not trying to argue just trying to help out.

I don't want to lose an inch after it settles but also looking at my CV angles am kindda hoping it does. They are pretty extreme right now.

No arguement to it, you are wrong, no matter if you have a 26 inch tall tire or a 35 inch it would be the same. Its been explianed clearly above tire height only changes the difference in ground to a ceratin point on the body that is it.

JeepBumm68 · **Posted:** Mon May 25, 2009 5:48 pm

can anyone tell me the flare length from top of flare to bottom of it. i need to know the length of the bevel tothe bottom of flare.

long_tall_texan · **Posted:** Mon May 25, 2009 6:09 pm

JeepBumm68 wrote:

can anyone tell me the flare length from top of flare to bottom of it. i need to know the length of the bevel tothe bottom of flare.

Not sure exactly what you are asking for. If it is for this measurement, you don't need it. Look at my next post to see where to measure...

JeepBumm68 · **Posted:** Mon May 25, 2009 6:14 pm

the reason i am asking though, is i have cut the clares up to the upper line of the stock flare. So i need to know what the measurement was of teh flare below that, so i can agument my measurements so i can have correct measurements.

long_tall_texan · **Posted:** Mon May 25, 2009 6:16 pm

OK. Here is a pic to show the difference between 2 tire sizes. I just used round numbers to make it easy. 29" tire to 31" tire comparison...

As you can see, the center of hub to fender measurement is the same regardless of the tire size (21.0"). Ground to fender increases with tire diameter (35.5" to 36.5"). Ground clearance also increases with tire diameter (11.3" to 12.3"). (yes, I know the LCA is not the lowest point, but it is for illustration purposes only)

long_tall_texan · **Posted:** Mon May 25, 2009 6:17 pm

JeepBumm68 wrote:

the reason i am asking though, is i have cut the clares up to the upper line of the stock flare. So i need to know what the measurement was of teh flare below that, so i can agument my measurements so i can have correct measurements.

No prob. I will go measure and let you know...

JeepBumm68 · **Posted:** Mon May 25, 2009 6:19 pm

ok thanks a lot Texan.

long_tall_texan · **Posted:** Mon May 25, 2009 6:40 pm

JeepBumm68 wrote:

ok thanks a lot Texan.

Looks like 2.75" to the first bend. Then 4.75-5" to where the plastic meets the steel.

JeepBumm68 · **Posted:** Mon May 25, 2009 6:49 pm

Ok thanks a lot texan.. With that i can give you guys correct measurements now.
Measurements without correction

Front Driver-23 1/2
Rear Driver-23 3/4
Front Passenger-23 1/2
Rear Passenger- 23 3/4

With correction

FD-20 3/4
RD-21
FP-20 3/4
RP-21
2006 CRD limited
40k miles Stock supension
Rear Rancho Shocks- 3-4'' lift shocks.
running X-Factor 3.5'' lift

tommudd · **Posted:** Mon May 25, 2009 8:21 pm

JeepBumm68 wrote:

Ok thanks a lot texan.. With that i can give you guys correct measurements now.
Measurements without correction

Front Driver-23 1/2
Rear Driver-23 3/4
Front Passenger-23 1/2
Rear Passenger- 23 3/4

With correction

FD-20 3/4
RD-21
FP-20 3/4
RP-21
2006 CRD limited
40k miles Stock supension
Rear Rancho Shocks- 3-4'' lift shocks.
running X-Factor 3.5'' lift

So you have a 3.5 inch lift but yet only sitting 2 1/4 inches above stock... :roll:

interesting

JeepBumm68 · **Posted:** Mon May 25, 2009 8:32 pm

ya ya tommudd. I know it is not netting any higher. But hopefully, the girl measured everything right also. Any ways this does prove that the stock suspension is sagging pretty bad. gives me proof now, and hopefully the girl well listen to my lift idea.

icarl · **Posted:** Mon May 25, 2009 8:37 pm

daspes wrote:

Rear: 24"

I wondered what would happen if i added the rear spacer to the OME's.

icarl · **Posted:** Mon May 25, 2009 8:41 pm

long_tall_texan wrote:

We are measuring from the center of the wheel to the fender. That will not change no matter what size tire you have.

true, unless you are using a 40" tire. :lol:

Actual Lift Amount - Lets Compare Fender Heights

Who is online