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Unread 09-22-2008, 01:59 PM   #1
SOLIDJP44
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33x9.50R15

is it worth me going from 31 to 33s i wan tto stay narrow bc i think my mpg wont drop as bad and i wont lose so much horsepower. I do like the narrower tires. i hardly do any wheeling anymore and is mostly a dd. Will a 33x9.5 look silly or what? I know it will probably run when disconnected , any other worries with jumping to a 33. the bf are really 32.7 and my maxxis is just about 30.6 so is that big diffrence in everyday driving...input please let me know whats the best route, 32s are to wide for me and my stock wheels so either 31x10.5 or 33x9.5

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Unread 09-22-2008, 02:06 PM   #2
Xlr8n
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You won't lose any 'horsepower' when going to a larger diameter tire, however your engine will have to work harder to turn the bigger tires, making it seem less powerful. A narrower tire will get better gas milage than a wider tire due to the narrower tire having less rolling resistance, but the biggest variable relating to power/acceleration is tire diameter.
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Unread 09-22-2008, 02:08 PM   #3
newbs
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My girlfriend likes her 33x9.5's replaced her 33x12.5's and her mpg went up.
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Unread 09-22-2008, 02:18 PM   #4
IslandTJ
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Quote:
Originally Posted by sport44 View Post
is it worth me going from 31 to 33s i wan tto stay narrow bc i think my mpg wont drop as bad and i wont lose so much horsepower. I do like the narrower tires. i hardly do any wheeling anymore and is mostly a dd. Will a 33x9.5 look silly or what? I know it will probably run when disconnected , any other worries with jumping to a 33. the bf are really 32.7 and my maxxis is just about 30.6 so is that big diffrence in everyday driving...input please let me know whats the best route, 32s are to wide for me and my stock wheels so either 31x10.5 or 33x9.5
Pizza cutters are starting to gain in popularity. I run 33x10.5 BFG MTs and am very happy with the performance thus far. Here's how they look:


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[Edit] "Now jeepin in Oregon" [/Edit]
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Unread 09-22-2008, 02:32 PM   #5
Zoom By You
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I think 33 X 9.5 will look fine but if you don't wheel-it much and it seems as though MPG is a concern, why even consider a larger diameter tire? I would think your MPG would suffer because your gearing would be less than optimal....
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Unread 09-22-2008, 02:42 PM   #6
SOLIDJP44
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any other suggestions my biggest reason for going taller is for looks, i know that seems terrible but i want to stay narrow
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Unread 09-22-2008, 06:01 PM   #7
cheapjeep06
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Try it. From side will look like any other 33" of different width (for looks). May need bumpstop spacers too keep from rubbing if disco'd. Check out the pics thread, might be a pic of 33x 9.50's.

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Unread 09-22-2008, 06:04 PM   #8
Speed911
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I don't think bfg makes any 33 x 9.5's anymore. Justt 10.50's right?
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Unread 09-22-2008, 06:22 PM   #9
PSYCH0
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Currently running 31x10.50's
Will 33x10.50's work on a TJ with 8" wheels with 4.5" without rubbing the flares (don't disco)?
Running 3.09 gears with a 6 Speed Manual Tranny so gearing may be an issue...
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Unread 09-22-2008, 06:23 PM   #10
SOLIDJP44
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i think yur right just a 10.5, im might consider those how does yours with 12.5 handle and mpg????
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Unread 09-22-2008, 06:27 PM   #11
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um nope they make a 33x9.5r15 in an at but not mt currently.
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Unread 09-22-2008, 06:34 PM   #12
IslandTJ
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Originally Posted by newbs View Post
um nope they make a 33x9.5r15 in an at but not mt currently.
You are correct
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[Edit] "Now jeepin in Oregon" [/Edit]
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Unread 09-22-2008, 06:49 PM   #13
rubidriver
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Originally Posted by Xlr8n View Post
You won't lose any 'horsepower' when going to a larger diameter tire, however your engine will have to work harder to turn the bigger tires, making it seem less powerful. A narrower tire will get better gas milage than a wider tire due to the narrower tire having less rolling resistance, but the biggest variable relating to power/acceleration is tire diameter.
the only horsepower that counts is rear wheel horsepower. with the 33s he will be loosing rwh and rwtorque. he will see mpg drops as well as power loss
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Unread 09-22-2008, 07:59 PM   #14
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Quote:
Originally Posted by PSYCH0 View Post
Currently running 31x10.50's
Will 33x10.50's work on a TJ with 8" wheels with 4.5" without rubbing the flares (don't disco)?
Running 3.09 gears with a 6 Speed Manual Tranny so gearing may be an issue...
Just a guess, but I think that manual's in 06 had 3.73 gears. So probably not as bad as you might think.

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Unread 09-22-2008, 08:57 PM   #15
Nazdreg
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Originally Posted by rubidriver View Post
the only horsepower that counts is rear wheel horsepower. with the 33s he will be loosing rwh and rwtorque. he will see mpg drops as well as power loss
I 100% agree that the only thing that counts is the power that hits the asphalt (dirt in our world) but I also agree with Xlr8n your Jeep isn't loosing any horsepower.

This is how I see it, and if I am missing something please chime in.

Let's disregard the weight, rolling- and wind-resistance of a larger wheel for now, the larger wheel will act just as a higher overall gearing, like starting your Jeep in 2.nd instead of 1.st - it takes longer time since 2.nd puts the engine outside the powerband at low speeds, where 1.st over revs the engine at higher speeds...... my point is that the gears has their strength at a different speeds.

So when driving 65 down the freeway in 5.th with a stock vehicle, the engineers designed the overall gearing so the engine was at the optimal rpm at this speed with the stock tires.
Once you change the overall gearing with larger tires you more or less take the engine out of that powerband, and you'll find yourself dropping into 4.th more often to get back into the power to get more torque onto the road.

So to put the engine back in it's powerband you need to change the overall gearing. I went from 30" tires to 33" tires (an approx. 10% increase in circumference), I think the engine rpm dropped about 10% at same speed. The differential gearing I have is 1:3.73 and if/when I re-gear to counter the 10 % increase in overall gearing by the larger tire, I should mathematically go with a 10% lower gearing such as the 1:4.1 gear and should pretty much put the engine rpms back to where they were before the larger tires.

Yes ? No ?
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