REVO 70 are HUGE!
- Thread starter TRD04RUNNER
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Boaz
New member
TeryT said:
so thats what 5mph? I have driven vehicles that are worse than that!!
Back in the day I have a 82 Chevy truck with 6 inch suspension lift and at one time had 38" tires on it, with a 4 speed manual and 4.56 gears... I NEVER had ANY IDEA how fast I was going, The speedo was so off from the gears and the tires!!! I know that when I was going 60 I really was going WAYYYYY faster!
Bobby
New member
Koz said:
This is really hard to explain w/o pictures but I'll try.
When you have different diameter tires on one axle, they spin at different rates and the diff compensates for it. This is fine at slow speeds like turning when it happens even with same size tires (which the diff was designed for) but when you go on the highways (freeways for you left coasters), the difference is pronounced and the diff has to compensate. The diff isn't designed for this and will wear too fast and in extreme cases, melt the gears. That's why 4x4s need same size spares.
Did that make sense at all?
JB.
New member
I'll post this here since this is where it's currently being discussed.
I appreciate efforts to answer this question. Certainly the pinion gears, being small, are not designed to be run fast for long periods.
My limited but well thought out perspective is this: Car manuals with donut spares understandably warn against fast speeds and long distances with the spare in use, but even in such an extreme case (tiny tire), 50 mph for a few tens of miles is deemed okay. In the case of the 4runner, the one inch difference is a virtually identical tire size by comparison. Additionally, as near as I can tell, following the same-side 5 tire rotation specified in the 4runner manual puts you at about a quarter-inch wheel size difference near the end of tire life due to tread wear difference (40,000 miles on each passenger side tire, 60,000 driver's side). So, apparently, unlimited driving with a quarter-inch difference is considered nothing.
Taking the two points above into consideration, I would have minimal anxiety driving a 1 inch smaller spare a few tens of miles at 60-65mph. Even so, I'd probably still do a little tire pressure adjustment to minimize the difference.
I appreciate efforts to answer this question. Certainly the pinion gears, being small, are not designed to be run fast for long periods.
My limited but well thought out perspective is this: Car manuals with donut spares understandably warn against fast speeds and long distances with the spare in use, but even in such an extreme case (tiny tire), 50 mph for a few tens of miles is deemed okay. In the case of the 4runner, the one inch difference is a virtually identical tire size by comparison. Additionally, as near as I can tell, following the same-side 5 tire rotation specified in the 4runner manual puts you at about a quarter-inch wheel size difference near the end of tire life due to tread wear difference (40,000 miles on each passenger side tire, 60,000 driver's side). So, apparently, unlimited driving with a quarter-inch difference is considered nothing.
Taking the two points above into consideration, I would have minimal anxiety driving a 1 inch smaller spare a few tens of miles at 60-65mph. Even so, I'd probably still do a little tire pressure adjustment to minimize the difference.
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Boaz
New member
I had a buddy in HS that had a Dodge Ram 2500 4X4 with a lift and 38"s on it. Since the tires cost so much, he did not have a full size spare. One day he got a flat on the Rear, so he put the OEM tire on the right rear. He drove around for 2 weeks with it like that. (he was not very bright) Well one day he needed to tow a trailer with a junk car on it, he called me 100 miles away from home needing a ride because his rear end grenaded!
His mechanic said it was because of the odd tire sizes. Now, this is an extreme case. With that being said, I am not worried about running the oem size spare with the 70 series Revos. I plan on buying a 5th Revo sometime, but If I need to use the spare I will. I will only use it to drive TO a tire store!
His mechanic said it was because of the odd tire sizes. Now, this is an extreme case. With that being said, I am not worried about running the oem size spare with the 70 series Revos. I plan on buying a 5th Revo sometime, but If I need to use the spare I will. I will only use it to drive TO a tire store!
IF you're going to buy a 70 just for the spare,
Why not just buy a less expensive tire like a Pathfinder or whatever America's Tire calls their own label? That way you get a 265/70/17 as a spare to drive back to the tire store and you won't have to for top line tire...
Boaz said:
Why not just buy a less expensive tire like a Pathfinder or whatever America's Tire calls their own label? That way you get a 265/70/17 as a spare to drive back to the tire store and you won't have to for top line tire...
TeryT
New member
Re: Re: IF you're going to buy a 70 just for the spare,
Besides, those guys have a big hassle getting the spare back in place with the lock that's on it. Took both Costco & Discount Tire about 15 minutes just to get that right!
This just seems to me to be a bigger hassle than it's worth. I'd rather get new tires every 50,000 miles instead of every 62,500 anyway, in case I want to change brands.Boaz said:
Besides, those guys have a big hassle getting the spare back in place with the lock that's on it. Took both Costco & Discount Tire about 15 minutes just to get that right!
JB.
New member
Boaz said:HUH?
I assumed you meant the owners manual 5 tire rotation pattern as shown in the pic. This would result in the driver's side tires having 50% more miles.
I've always rotated front to back and the manual simply reinforced that fixed idea. I assumed everyone would do it that way. Since my last post I've done a lot of reading about rotation and everywhere you look the recommendation is for a cross rotation pattern for 4WD or AWD, HOWEVER, on the same websites, consultation of the owners manual nearly always supersedes any other recommendation.
The most thorough T4R rotation discussion seems to be <a href="http://www.toyota-4runner.org/showthread.php?threadid=8866&perpage=15&highlight=rotate&pagenumber=1" target="_blank">here</a> <br />
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Bluto
New member
JB. said:
AWD, 5 wheel:
http://www.tiresafety.com/service/serv_nav.htm
Using the spare would be about 20% more miles overall.
But if the owners manual states differently, it should be followed.
(added link)
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Tire Rotation
If that is the picture in the manual (I don't have mine in front of me), then it is pretty clear that the manual is wrong since there would be no benefit to doing a 5 tire rotation.
It may be that the OEM tires are unidirectional, which would require remounting the tire that gets crossed over in order to make it run in the correct direction. That would mean that you can't easily do it yourself. It would also not make the extra miles you get between new tires cost effective.
If that is the picture in the manual (I don't have mine in front of me), then it is pretty clear that the manual is wrong since there would be no benefit to doing a 5 tire rotation.
It may be that the OEM tires are unidirectional, which would require remounting the tire that gets crossed over in order to make it run in the correct direction. That would mean that you can't easily do it yourself. It would also not make the extra miles you get between new tires cost effective.
JB.
New member
Re: Tire Rotation
Apparently, the advantage of the owners manual 5-tire rotation is in minimizing tire diameter difference between the spare and in-use tires. A new spare could be as much as 3/4 (diameter) bigger than a tire near the end of life. The OM way, the difference ends up being about 1/4 inch near the end of life. I'm getting close to my first tire rotation and am still trying to decide between listening to Toyota or BFGoodrich which recommends a semi-cross rotation for 4WD.
coldbivy said:
Apparently, the advantage of the owners manual 5-tire rotation is in minimizing tire diameter difference between the spare and in-use tires. A new spare could be as much as 3/4 (diameter) bigger than a tire near the end of life. The OM way, the difference ends up being about 1/4 inch near the end of life. I'm getting close to my first tire rotation and am still trying to decide between listening to Toyota or BFGoodrich which recommends a semi-cross rotation for 4WD.
That might be what they are thinking. Seems like you'd be guaranteeing that you'll have a small size mismatch for the entire life of the car instead of a larger mismatch for the short time it takes to get a tire repaired.
You could avoid this by changing the side that you rotate the spare into every once in a while. Or just do the other pattern. Rotating tires isn't much of a science so I wouldn't hesitate to follow a different patter if it makes sense to you. You just have to make sure that unidirectional tires are rotating in the correct direction. Most people don't even rotate their tires and the only affect that has is a shorter life for the set of tires.
Open diffs are amazingly durable. Other than the oil seal leaking, I've never had one fail on me. On my last vehicle, I had a full size spare which was not worn at all and was a different brand from the tire on the other side of the axle for over a thousand miles. It didn't cause any problems. Personally, I wouldn't sweat over a small size difference.
You could avoid this by changing the side that you rotate the spare into every once in a while. Or just do the other pattern. Rotating tires isn't much of a science so I wouldn't hesitate to follow a different patter if it makes sense to you. You just have to make sure that unidirectional tires are rotating in the correct direction. Most people don't even rotate their tires and the only affect that has is a shorter life for the set of tires.
Open diffs are amazingly durable. Other than the oil seal leaking, I've never had one fail on me. On my last vehicle, I had a full size spare which was not worn at all and was a different brand from the tire on the other side of the axle for over a thousand miles. It didn't cause any problems. Personally, I wouldn't sweat over a small size difference.
