| Author |
Message |
    
Chris
| | Posted on Tuesday, November 19, 2002 - 09:21 am: | 
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I just put these tires on my D2, they are a perfect fit and I love them but I am not sure about air pressure, right now I have 35 front and 45 rear. The rear is all right but the front has a weird feeling like its mushy. My D2 is stock. Thanks for the help. |
ryanspeed
| | Posted on Tuesday, November 19, 2002 - 09:45 am: |
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I have the exact same tires, and I run the same pressure as you. I found that if the front pressure is higher, they wear faster. Mushyness could be due to the soft stock suspension. |
Chris
| | Posted on Tuesday, November 19, 2002 - 10:08 am: |
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Thanks for your help, how many miles do you have on them and how long do you think you will have them for. I used to have a S-10 Blazer years back and got about 100,000 miles outta them, I know the LR is heavy so I have a feeling they will wear out faster, and they were expensive too!!! |
Jorge
| | Posted on Tuesday, November 19, 2002 - 10:35 am: |
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Chris,
I am planning to fit some 255-70 R16 tires in my stock D2, but I wonder if I have to make any mods. right now I have the 255-65 R16 on it. did you have to trim or lift the disco for these tires?
Jorge |
Dean Brown (Deanbrown3d)
| | Posted on Tuesday, November 19, 2002 - 10:46 am: |
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You can fit 265/75/R16 without trimming on a stock D2. |
RJ Clayton (Tozovr)
| | Posted on Tuesday, November 19, 2002 - 10:47 am: |
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45psi is a lot of pressure...the Max ratings on the sidewalls are for your truck FULLY loaded. Thake the load rating of your tire and the weight of you truck and go from there...
There may be a decal on the inside of a door giving reccommended pressures. |
Chris
| | Posted on Tuesday, November 19, 2002 - 10:53 am: |
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Well I do carry some weight in the back of my truck, recovery gear, shovel, etc. and I figured that it is a slighty bigger tire than the old stock wranglers so it would need more air. Also the sidewalls on the tires say it needs 65 psi which is obviously too much. |
RJ Clayton (Tozovr)
| | Posted on Tuesday, November 19, 2002 - 11:05 am: |
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yeah 65 is for the max rating of the tire...so you're probably not far off. |
Carl_kps
| | Posted on Tuesday, November 19, 2002 - 12:16 pm: |
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Dean I but BFG 245/75 R16 on a stock D2 and that looks about as big as you can get without rubbing. Anything bigger than that you night have to do some triming.
Also anyone know what the correct pressure would be for BFG 245/75 R16 on the D2. I know the decal on the door states 28psi frount 46 back. Would that change for these tires? |
James F. Thompson Jaime (Blueboy)
| | Posted on Tuesday, November 19, 2002 - 01:37 pm: |
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I can't take credit for this and hopefully it may help:
"There is an optimum tire pressure necessary for best longevity of tread as well as performance and it isn't necessarily the pressure on the tire or the door post. Those are base line numbers. You have to determine what's best for your tires based on the load you are carrying and average speed you are driving.
You should begin checking the pressure for that base line number at home in the garage before the trip when the tires are cold. After fifteen or twenty miles at normal highway driving speed pull off into a rest stop and check tire pressure again.
(yes, this is tedious but it only takes ten minutes and may give you several thousand more miles of tread wear as well as reduce the number of unnecessary alignments you have to pay for at LR dealer rates)
There will be a difference of pressure in each of the four wheels from what was there when you began the trip. If everything is good the tire pressure should GO UP about 10% of the original (cold) pressure because of the heat expansion of the air in the tire from sidewall flexation. You have to adjust the tire pressure to achieve this 10% rule for best tire wear. This takes some cockied logic; if the percent of change is greater than 10% (say the pressure went from 30# cold to 38# hot, a 24% rise)ADD air because the tire wasn't hard enough to start with and the excessive flex of the sidewall rubber created more heat (ergo higher pressure) - if the percent of pressure rise was less than 10% the tire was too firm to start with and didn't flex enough for good wear and traction properties, therefore you have to let some air out.
Think about it and it will drive you crazy or make perfect sense. As always, the caveat, anyone having reason to believe that my logic is flawed please respond - I'm using information I gathered twenty years ago and it may be different now based on new tire technology. Happy Rovering!"
Jaime |
Parrish R. Blackmon (Discoveryfl)
| | Posted on Tuesday, November 19, 2002 - 01:51 pm: |
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The front tire pressure should be higher than the back to accomodate for engine weight. 35-front and 45-rear is a pretty big variance even for carrying additional cargo weight. I run 42 front and 40 rear with zero wear problems. The key is keeping the tires balanced and rotated every 3,000 miles or so. This is a must for the AWD. 35psi front will feel mushy even with a stiff suspension. What's strange is that Land Rover recommends 22psi accross all wheels for the 1997 Discovery. This psi is like driving on flats, and it kills the fuel mileage (which as we all know is not great to start). |
Mark Albrecht (Markalbrecht)
| | Posted on Tuesday, November 19, 2002 - 02:52 pm: |
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Blueboys' method seems to have some logic to it, but I've never used that method. I always took the max load per tire and multipled by 4 to get total tire load then I divided by typical vehicle weight (truck + occupants + gear). Using that ratio I figured the PSI I should be running from max tire PSI. Of course that's only a baseline and you may want to figure in LR's suggested front to rear difference. Once I had a baseline pressure, I used the chalk line method (line across tread to determine even wear). |
James F. Thompson Jaime (Blueboy)
| | Posted on Tuesday, November 19, 2002 - 03:53 pm: |
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Can't take credit it for it Mark and agree I like the chalk line method better:
"you could put a chalk line across the tread and drive straight for a few
revolutions of the tire. the chalk should wear evenly with the correct
pressure. more chalk worn in the center means too much air. chalk worn
near the shoulders mean too little air."
Jaime |
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