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Post by cr884runner on Jan 15, 2008 10:07:08 GMT -5
Right now I am running 30x9.5 street michelin tires on my stock rims. I was wanting to keep my stock rims primarily for saving money on rims and gas mileage. I was running 32x11.5 bridgestone duelers which seemed very heavy for the tire on 15x10 offset rims, but I dont know if it was the tires or rims or maybe because I was with stock gears but I was getting horrible gas mileage.
I was looking at getting rid of those rims and tires and possibly buying some 27x9.5 ssr radials for my stock rims. My question is that too small of a tire and how would it affect power and gas mileage and all that. I am primarily on the road and highway with Id say 10% percent off road.
Ive heard many people get good gas mileage with the ssrs but then again those are chevy guys. Any input is appreciated. Thanks.
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Post by fourwd1 on Jan 15, 2008 12:15:38 GMT -5
A taller tire with stock gearing will lower MPG and rob you of some power. And since the speedo and odo are no longer calibrated, you'd have to compensate for that when calculating MPG to it right.
If it were me, I'd have the 11.50's on 8" rims (or smaller), not 10".
I too have heard good thing aout SSR's, and BFG AT's are a good multi-purpose tire.
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Post by DeadlyPeace on Jan 15, 2008 13:32:32 GMT -5
I've got BFG AT's on my DD right now and they're going on their third year and have about 15% tread left. They are a good multi-purpose tire and handle real well.
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Post by cr884runner on Jan 15, 2008 14:07:36 GMT -5
I apologize if I typed too much and didnt ask my question correctly.. I was wondering if I dropped to a 27x9.5 tire if it would get better gas or lose power or what not. I am currently running a 30x9.5 tire and only plans for suspension for future is ball joint spacer and torsion bars cranked. Thanks a lot.
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Post by DeadlyPeace on Jan 15, 2008 15:25:54 GMT -5
As fourwd1 was trying to say is that you will get better MPG and power with smaller tires.
Basically the taller your tires are the more power they are going to steal unless you regear for them.
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Post by cr884runner on Jan 15, 2008 15:40:51 GMT -5
Ok well for offroading a little and having ball joint spacers and torsion bars cranked would that be too small of a tire?
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Post by DeadlyPeace on Jan 15, 2008 15:57:16 GMT -5
What type of offroading do you plan to do?
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Post by cr884runner on Jan 16, 2008 15:08:36 GMT -5
For myself, my truck is a daily driver and once in a while we go muddin or go to the dunes or climb up some hills. We dont rockcrawl or anything intense, but I didnt know if those small of tires would do horrible in situations like that. Might step it up to 29x11.5 ssr's with 15x8 rims then perhaps.
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Post by cr884runner on Jan 20, 2008 22:18:10 GMT -5
Plus Ill be going off to college next year where there will be some hilly terrain around Monterey, but I plan on adding the ball joint spacers with torsion bars cranked and add possibly a inch block to the rear... Id like to keep it around stock size on diameter as I dont want to lose mpg's, but what would you all say for that type of setup?
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Post by yotanut7 on Jan 21, 2008 0:17:22 GMT -5
If its a daily driver and you are concerned about mpg, keep with the stock size or maybe up one from that. Dont bother with a lift with and buy some nicer, 28 to 30 inch tires. The factory 6" wide wheels would be perfect for these size tires. A lift will gain you minimal clearance and give you a slightly higher profile, which could result in lower mpgs. I ran the stock 225/75R15 on my pickup and got 22-25 mpg and it still kicked ass off road.
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Post by larry073 on Jan 21, 2008 0:37:42 GMT -5
On my 87 i had when i went from 235s to 31's my MPG got better but i drove mostly highway. when i was in a tight spot and needed tires i got a good deal on a set of 225's and it hurt my gas mileage, when i really got into upgrading my truck and lifted it with 33's i realized i had better mileage all around with the 31's ...i dont know what was up with all that.
If anyone has a method to this madness let me know. BTW it was an 87 p/u 22r 5 speed 4.30 gears.
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Post by cr884runner on Jan 21, 2008 2:58:19 GMT -5
Maybe because the gear size and due to the fact running such small of tires, your engine had to work harder meaning more rpms meaning more gas and less mpg... Thats the only thing I can think of, but I ran these michelin 30s and I get around 17 highway with a v6 and a tad bit of lead foot, but with the 32x11.5 tires I was getting horrible gas mileage. Could be possibly due to the weight of those michelins possibly and how wide they were on 15x10 rims.
I just figured that dropping from 32s to 30s made that much of a difference that if I dropped to a 29 and added a little weight such as having a wider tire then I should be in the same ballpark range as having the 30 inch tire. Does that make sense or am I out of whack on that one?
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Post by yotanut7 on Jan 21, 2008 9:37:19 GMT -5
Yes, wider wheels and tires are heavier and take more energy (more gas) to turn. In theory dropping a tire size in exchange for width should get you similar mpg. For which ever tire size you end up going with, try to use 15x6 or 15x7 toyota wheels, less weight there.
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Post by cr884runner on Jan 21, 2008 12:31:29 GMT -5
Ok well say I went out of the stock rims which are 15x7 for me. I was looking at the 15x8s from rock crawler but are steel rims going to put a huge dent on my mpg?
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Post by DeadlyPeace on Jan 21, 2008 14:12:57 GMT -5
I've ran the same size steel and aluminum and found no real difference in the MPG. Steel rims will hold up better and if needed be bend back into shape, whereas aluminum will crack or break.
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Post by cr884runner on Jan 21, 2008 14:19:28 GMT -5
O ok well if the difference in mpg isnt noticeable at all then steel seems to be the best route. Thank you very much for all the help.
Also, just curious since I am on the issue, what does backspacing refer to on wheels. Unless I am mistaken, the less inches of backspacing the more the rim sticks out away from the rotor correct? Thank you.
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Post by 4runnerdan on Jan 29, 2008 0:31:35 GMT -5
ahh, i have 31x10.5 michelins on my 91 4runner v6 and it seems like it is a slow turd with really bad gas mileage. and i keep them aired up pretty high when driving around town. and i seem to still average less then 200 miles to a tank. and i belice i have a 16 gallon tank?
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Post by cr884runner on Jan 29, 2008 0:35:53 GMT -5
ya its a 16 gallon tank and with 30 michelins i am gettin near 250 miles on a tank... you also gotta remember, when you bump up the tire size your speedometer is off along with your odometer meaning you are getting less miles than that on a tank...
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Post by 4runnerdan on Jan 29, 2008 0:50:36 GMT -5
i might not mind paying for the gas if it wasn't so slow.
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Post by cr884runner on Jan 29, 2008 1:04:40 GMT -5
I feel ya.. I understand the concept of a gas hog if the vehicle hauls a** but when she is slower than all these little import cars, there is a problem. Many, many times I have wanted to sell this thing and go to the bowties for that reason.
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