30 or 31 tires on 15 rims, stock suspension TJ - JeepForum.com
 
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post #1 of 9 Old 04-10-2019, 10:21 AM Thread Starter
floyd88
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30 or 31 tires on 15 rims, stock suspension TJ

Trying to decide if I want to go with 30 or 31 inch tires. Also trying to decide if I want to keep the stock 15 inch rims, or buy new rims too. I'm afraid that 30 or 31 on a 15 rim would be too much tire to rim ratio. Would love to see some pics with stock suspension to help me decide!

Thanks in advance!

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post #2 of 9 Old 04-16-2019, 06:09 PM
grogie
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This was the day after I bought my TJ new in 2005. It came with 30" tires on 15x8" wheels. IMHO, neither 30" or 31" is too much tire for 15x8" wheels... most Jeep guys want more tire then wheel. Along with a lift, I ran 32" tires for years with 15x8" wheels. (I'm now running 33" tires on 16x8".)



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post #3 of 9 Old 04-16-2019, 06:27 PM
Hbromberg
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Not sure why it is sideways - but . . . 15 x 8 with 30x9.5 tires. I like the look
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post #4 of 9 Old 04-17-2019, 10:37 AM Thread Starter
floyd88
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Thanks Guys!

30 inch looks good, not too much tire to wheel ratio. I imagine 31s would look pretty similar, and probably what I will go with. Think I'll keep my current wheels then and just get new tires to save some money.

I'm also a little concerned about putting 31s on stock suspension without rubbing. I've seen on here that 31s will fit stock without problem, but my jeep has 170k miles on its suspension. Does suspension sag that much over time, or should I still be fine? A new suspension is on my to-do list, but further down the road.
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post #5 of 9 Old 04-17-2019, 03:32 PM
222Doc
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a 15"x8 could roll a 35"+. matter of fact that ratio of side wall to rubber is about ideal off road. ran that on my JKR for years. It as well ran 1000R/t miles trips to the Rubicon like that driven there. I tow it these days but i went 37s and for them 17" wheels is better. The same ratio of tire to rubber as well. still good street but i aint wearing down expensive tire on pavement unless i have too. But a 15" wheel is better for 35" down. though that selection gets smaller ever year. But they cost MUCH less in 15" then say 16+" wheels. bigger the wheel the more the tire cost. if they had 37s for 15" i might have not changed wheels.

dont forget gear ratio at a point the larger tire will kill performance. especially older jeeps 2011 and down. tend to need much more gear. So going up in tire could have hidden cost that is getting into real money for gears.

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post #6 of 9 Old 04-18-2019, 08:42 AM Thread Starter
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Do you think putting 31s on a 1999 Sport would need anything done for the gears?
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post #7 of 9 Old 04-20-2019, 10:39 PM
mukluk
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Quote:
Originally Posted by floyd88 View Post
Do you think putting 31s on a 1999 Sport would need anything done for the gears?
Depends what your current gearing is. If you have the most common gearing found on the Sport model which is 3.07 ratio, then you'll likely notice a loss of power with the larger tires. Jeep normally offered the 30" tire package coupled with the optional 3.73 ratio gearing, and when they came out with the Rubicon model for '03 with its roughly 31" equivalent tires it came with 4.10 gearing. If your Jeep hasn't been regeared over the years, you may well still have a metal tag affixed to one of the diff covers that is stamped with the gear ratio.

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post #8 of 9 Old 04-22-2019, 10:17 PM
Kim'sJeep
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My 99 TJ came with 31x10.50x15 tires. As far as I know it is all stock. I have no issues driving down the road, getting on the freeway, or turning. Being this is my first TJ, I wouldn't know what the other size wheels would feel like as far as power goes.
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post #9 of 9 Old 04-23-2019, 04:48 AM
TheBoogieman
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31s are stock size for Rubicons.
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TheBoogieman is a jerk.
03' Rubicon/Zone 4" coils with 1" spacers up front/Rancho shocks/5.13 gears-35" MTZs/Black Magic brakes.
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