Tire size questions for the GX470
#1
Rookie
Thread Starter
Tire size questions for the GX470
Hello all
I just bought a 2007 GX470 and am liking it allot, I have been reading here till my eyes bleed lots of good stuff.
I need tires and am looking at the Cooper Discoverer A/T3's in size 285/70R17 , will that fit a stock non lifted truck? Will they rub?
Also is there a speedo correction fix when going to a bigger tire size?
Thanks
Seth
I just bought a 2007 GX470 and am liking it allot, I have been reading here till my eyes bleed lots of good stuff.
I need tires and am looking at the Cooper Discoverer A/T3's in size 285/70R17 , will that fit a stock non lifted truck? Will they rub?
Also is there a speedo correction fix when going to a bigger tire size?
Thanks
Seth
#2
Pole Position
I believe 265/70/17 is the largest you can go with no lift and get no rubbing.
#4
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We're running 265/70/17 General Grabber AT2's on our GX and I get a tiny bit of rubbing on the driver side at full left turn, nothing to be worried about. I think that size is perfect unless you're getting into heavy mods, then the 285 would be OK.
http://tctmagazine.net/january-2014-...nsport-f-a-s-t
http://tctmagazine.net/january-2014-...nsport-f-a-s-t
#5
Lexus Champion
I need tires and am looking at the Cooper Discoverer A/T3's in size 285/70R17 , will that fit a stock non lifted truck?
- That's almost a 33" tire, so no, it won't fit a stock height GX.
Will they rub?
- Yes. Those 285s will rub on a lifted GX too. My front is lifted 2.5" and I'm running a 285 tire (11.5" width / 31.50" diameter) and I don't have any room for a larger diameter tire.
Also is there a speedo correction fix when going to a bigger tire size?
- No.
- That's almost a 33" tire, so no, it won't fit a stock height GX.
Will they rub?
- Yes. Those 285s will rub on a lifted GX too. My front is lifted 2.5" and I'm running a 285 tire (11.5" width / 31.50" diameter) and I don't have any room for a larger diameter tire.
Also is there a speedo correction fix when going to a bigger tire size?
- No.
#6
Pit Crew
We're running 265/70/17 General Grabber AT2's on our GX and I get a tiny bit of rubbing on the driver side at full left turn, nothing to be worried about. I think that size is perfect unless you're getting into heavy mods, then the 285 would be OK.
http://tctmagazine.net/january-2014-...nsport-f-a-s-t
http://tctmagazine.net/january-2014-...nsport-f-a-s-t
#7
I just got these Duratracs in 265/70/17 and they do rub, slightly, at full lock on the fender liner just behind/below the fog lights. On both sides, it's an area that seems unnecessarily bulged into the wheel-well. Heat gun should fix that. Then, gotta take care of the toyota center caps.
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#8
Pole Position
I just got these Duratracs in 265/70/17 and they do rub, slightly, at full lock on the fender liner just behind/below the fog lights. On both sides, it's an area that seems unnecessarily bulged into the wheel-well. Heat gun should fix that. Then, gotta take care of the toyota center caps.
I'm running the same size Duratracs on FJ Cruiser wheels, and I get no rubbing that I'm aware of, do you know the width/backspacing of those wheels?
#10
I'm running BFG AT 265/70/17 on mine. I had them installed at stock height and they rubbed only when the wheels were fully cocked. Since then I raised the ruck 2" and I could probably go 285 without rubbing.
Keep in mind that if you go bigger than 265/70/17 and you have tow hitch installed, you won't be able to store your spare tire. Mine barely fits now. I'm looking for rear door mount options so I can go a little bigger tire next time.
Another thing to consider is the gear ratio. I've heard that it is pretty difficult to change out the gear ratio on our trucks (availability) if you decide to go taller tires.
Keep in mind that if you go bigger than 265/70/17 and you have tow hitch installed, you won't be able to store your spare tire. Mine barely fits now. I'm looking for rear door mount options so I can go a little bigger tire next time.
Another thing to consider is the gear ratio. I've heard that it is pretty difficult to change out the gear ratio on our trucks (availability) if you decide to go taller tires.
#11
Anyone care to offer if MPG took a hit going +1 from OEM sizing to 265x70x17
I'm in the market for tires and they clearly look better than OEM, but if it's dropping MPGs by 2 or more on the wife's grocery-getter it's a consideration...
At present averaging 17.5 even mix of town and highway. 19.5 on highway trips (at 75mph). Reasonable...
I'm in the market for tires and they clearly look better than OEM, but if it's dropping MPGs by 2 or more on the wife's grocery-getter it's a consideration...
At present averaging 17.5 even mix of town and highway. 19.5 on highway trips (at 75mph). Reasonable...
#12
Anyone care to offer if MPG took a hit going +1 from OEM sizing to 265x70x17
I'm in the market for tires and they clearly look better than OEM, but if it's dropping MPGs by 2 or more on the wife's grocery-getter it's a consideration...
At present averaging 17.5 even mix of town and highway. 19.5 on highway trips (at 75mph). Reasonable...
I'm in the market for tires and they clearly look better than OEM, but if it's dropping MPGs by 2 or more on the wife's grocery-getter it's a consideration...
At present averaging 17.5 even mix of town and highway. 19.5 on highway trips (at 75mph). Reasonable...
I definitely took a hit after adding Duratracs. It looks like about 1.5 loss around town and haven't done any road trips. My highway mileage was right at 17 on a 660 mile round trip through Western Idaho at 80mph on cruise. I was getting 16 around town before the tire change.
These values are based on the truck's computer and don't account for errors from differing tire diameters.
#13
Pole Position
I definitely took a hit after adding Duratracs. It looks like about 1.5 loss around town and haven't done any road trips. My highway mileage was right at 17 on a 660 mile round trip through Western Idaho at 80mph on cruise. I was getting 16 around town before the tire change.
These values are based on the truck's computer and don't account for errors from differing tire diameters.
These values are based on the truck's computer and don't account for errors from differing tire diameters.
#14
In all fairness, those numbers aren't good for anything as they don't account for the increased diameter. The computer shows mileage got worse, but you're now travelling farther than the computer thinks so without correcting the numbers, you can't even say if they are better or worse with any certainty.
Before (265/65/17 = 30.6" diameter)
After (265/75/17 = 31.7")
so the ratio is 1.0359477124183 or about 3.6% larger and therefore mileage should only drop by 3.6% or 0.62 MPG (17.0MPG x 0.036).
Even still, you're right, my numbers still aren't comparable because I have been almost exclusively driving in the city since I changed the tires.
#15
Rookie
Thread Starter
I'm running BFG AT 265/70/17 on mine. I had them installed at stock height and they rubbed only when the wheels were fully cocked. Since then I raised the ruck 2" and I could probably go 285 without rubbing.
Keep in mind that if you go bigger than 265/70/17 and you have tow hitch installed, you won't be able to store your spare tire. Mine barely fits now. I'm looking for rear door mount options so I can go a little bigger tire next time.
Another thing to consider is the gear ratio. I've heard that it is pretty difficult to change out the gear ratio on our trucks (availability) if you decide to go taller tires.
Keep in mind that if you go bigger than 265/70/17 and you have tow hitch installed, you won't be able to store your spare tire. Mine barely fits now. I'm looking for rear door mount options so I can go a little bigger tire next time.
Another thing to consider is the gear ratio. I've heard that it is pretty difficult to change out the gear ratio on our trucks (availability) if you decide to go taller tires.
I am planning on going all out with a top shelf Icon coil overs and rear shocks and running a 32 inch tire, I would asume I will need gearing. I will make a phone call and report back to this thread.
Seth