06 TR4 4WD Sport: I installed 08-LTD 18" Wheels & Toyota Master Tech say not to do?

[4runnerjack]

06 TR4 4WD Sport: I installed 08-LTD 18" Wheels & Toyota Master Tech say not to do?

He says my odometer will be off by 5 miles per hour and it is bad for ABS & Stability Control & Traction Etc? I told him I read hear on the forum that it is ok to do? He says no way it is bad, point bank, no questions asked, done deal. He is a master tech and we are not? I asked him, does Toyota make a different set up/system or calabration for SR5 16" - Sport 17" - 18" LTD? He did not have an awnser for that. I looked online and I could not find a different setup for trim level and wheel size? I think he is wrong. I think there is and can be danger in certain situations with certain cars but I used OEM Rims & OEM tires size for the LTD TR4 and I put them in my TR4 Sport. Does anyone know for sure if he is wrong? Thanks

 

[kimboy]

I think the diameter of an 18" wheel and tire is actually smaller than the 265 70 17's. Yes the real mph will be off, but tell him to install them anyways.

 

[SecretAgent]

yes he is wrong. there is a minimal difference in the rolling distance of the two setups, but there is no difference in the sr5/sport/limited speed sensors, programming or otherwise. just because he's a master tech, doesn't mean he knows wtf he's talking about.

oh and your speedo will probably be more accurate with the new wheels and tires than it was before.

 

[Axis]

When I was researching buying my T4R I went to a dealership to ask the master mechanic about issues people typically have with runners. I told him I'd heard the Xreas can sometimes fail. He said "What's Xreas?":wow2:

 

[Jed]

The 265/60/18 tire is the equivalent of a 265/65/17. The speedo will be off by 0.01%, which means that your speedometer will show 60 MPH when you are really going 59.9.

So it's the diamter of the tires, not the wheel size that matters. In other words, if you wanted to put 20" wheels on your 4Runner, you could just buy the proper set of tires and still maintain the correct overall diameter, which means you wouldn't have any speedometer error.

Your Master Tech should be ashamed of himself for misleading you with his terrible advice.

 

[p nut]

General rule of thumb - What ever you hear at the dealerships, assume they are wrong until it is proven to be correct by a knowledgeable third party.

 

[SkylineGTRracer]

Agreed I really don't listen to the "master tech" if they dont even know the engine name. plus its all laid out for them on the computer. if your worried about the speedo Hypertech has that tuner to correct that.

 

[jbailey]

Unless tied in to a GPS the abs and stability controls would have no way of knowing the difference between wheel speed and actual speed. So you could run 35's and not effect the abs, speed wise.

I could see an argument that it could effect the NAV system b/c the two systems would not be in sync. But at what point is the difference in tire size large enough to make a difference?? Not sure about that, and then just get it re-calibrated.

 

[audiqtr]

The 265/60/18 tire is the equivalent of a 265/65/17. The speedo will be off by 0.01%, which means that your speedometer will show 60 MPH when you are really going 59.9.

So it's the diamter of the tires, not the wheel size that matters. In other words, if you wanted to put 20" wheels on your 4Runner, you could just buy the proper set of tires and still maintain the correct overall diameter, which means you wouldn't have any speedometer error.
QUOTE]

:iagree: This is 100% Correct. :iagree:

 

[Jed]

Unless tied in to a GPS the abs and stability controls would have no way of knowing the difference between wheel speed and actual speed. So you could run 35's and not effect the abs, speed wise.

I could see an argument that it could effect the NAV system b/c the two systems would not be in sync. But at what point is the difference in tire size large enough to make a difference?? Not sure about that, and then just get it re-calibrated.

Yes, but in this particular case, there is no real difference in tire size. A 0.01% difference is less than the difference between a set of tires when new and when worn. In fact, the OP could run his new 18" wheel/tire setup and if he got a flat, he could use his original factory spare wheel/tire without any worries at all because it is the same overall diameter.

 

[simple]

In fact, the OP could run his new 18" wheel/tire setup and if he got a flat, he could use his original factory spare wheel/tire without any worries at all because it is the same overall diameter.

I am in full agreement with everybody here, but just out of my own curiosity. Its probably insignificant, but an 18in wheel will be heavier than the 17in or 16in counterpart. Would going with 2 different size wheels in 4wd with the center diff locked create any problems?

 

[imdav2u]

Try this web site,you can put in the tire sizes and it will tell you the all you need to know from size to speed difference.

Tire size calculator

 

[p nut]

Also, realize that the tire sizes vary by manufacturers even when the indicated sizes are the same. Another variable is the stock speedometer. In most cases, if you check with GPS or radar, it is off by 2-3%. When I switched up to 32's, I actually found it to be about right on.

Would going with 2 different size wheels in 4wd with the center diff locked create any problems?

No.

 

[IOP25]

Tell that guy he's a clown. I have a sport edition with limited wheels. He needs to get his super master tech license. :biggrin2:

 

[Jed]

I am in full agreement with everybody here, but just out of my own curiosity. Its probably insignificant, but an 18in wheel will be heavier than the 17in or 16in counterpart. Would going with 2 different size wheels in 4wd with the center diff locked create any problems?

The weight would definitely depend upon the design of the wheel and other factors such as the material used to form the wheel. But in general, I think an 18" wheel with a lower profile tire will be very close in overall weight to a 17" wheel with a higher profile tire.

As far as the center diff or other 4wd issues, it is only the overall diameter of the tire that matters. The 4wd system has no way of knowing the size of the wheels, so as long as the overall diameter is the same, there will not be any issues at all.

 

[T4RVA]

The weight would definitely depend upon the design of the wheel and other factors such as the material used to form the wheel. But in general, I think an 18" wheel with a lower profile tire will be very close in overall weight to a 17" wheel with a higher profile tire.

As far as the center diff or other 4wd issues, it is only the overall diameter of the tire that matters. The 4wd system has no way of knowing the size of the wheels, so as long as the overall diameter is the same, there will not be any issues at all.

Then, I guess I'm screwed with my new 33" tires in regards to center diff and 4wd issues. By the way, what issues? Thanks.

 

[Jed]

Then, I guess I'm screwed with my new 33" tires in regards to center diff and 4wd issues. By the way, what issues? Thanks.

No, you won't have any issues. Your speedometer will be off, but no 4wd issues as long as your tires are all the same size.

I was telling the OP that going from 17" to 18" wheels will not cause speedo error as long as the overall diameter of the tires is the same. When it comes to 4wd issues, there won't be any as long as all 4 tires are the same size, even if they are 33" tires. The 4wd system only cares that a complete rotation of the tire is the same on each corner.

 

[witchdoctor]

Personally, I would remove the 18's immediately.... and, um, sell them to some other forum member (me).

 

[av8or]

Personally, I would remove the 18's immediately.... and, um, sell them to some other forum member (me).

i love my 18's... didn't like seeing my 17's on tacomas when i had my '05 limited.. i think it lost its exclusivity when they did that... thank god they kept the 18's on the limited and urban runner only this time around... :bravo:

 

[4runnerjack]

Thanks for the replies. I swapped the wheels and I think they look great. What is kind of sticking with me is how this Tech was so just so adamant and with so much conviction. Even if he is wrong he believes fervently that this is the wrong thing to do. For me as a rule in life regardless when someone in the know is so emphatic about something I try to consider it more closely rather than just fluffing it off. He said they covered this in certain detail at Toyota Tech School or training or what ever and between swapping wheels from different sizes to different models to different trim levels ect and they Toyota strongly discourages this because of non published implications or what ever. Thanks for all the input. I feel like I have more info now but he was pretty convincing. He certainly was sincere and serious enough about it to make me wonder.
Thanks