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Car Forum / Jeep / April 2006Tire size for my 90YJ
ive a 90 YJ, 1.5 inch spring lift 1 inch body lift, four banger, stock rear axel, stock manual trans, im running 30 inch tires now, when i climb over the pass, on the highway im iether in too high a gear or too low a gear, i have to slow way down, and drop a gear, my question is this, i do maybe 100 miles a month in my jeep on the highway, maybe 50 around town, but on the weekends we like to go humping out in the boonies, and my tires are all worn out, and i need another set, my neighbor has 33 inch tires and is pushing me to buy 33"s, whats that gonna do to my all around driving? what about 32's or 31's thanks, jp If your having problems on hills now, its gonna be worse with larger tires. Your gonna need a higher gear ratio to get max use outta your tranny. Sounds like you've got the 2.5L four banger. If so, tough luck. If you have the 4.0L six, with your setup you can go to a 31X10.50 tire with out problems (still need higher gears though). You have to go with a taller lift for tires bigger than that or they will rub on your springs and fender flares. I have 33X12.50s on my 91 Wrangler 4.0L, but I have 5" of lift and 4.10 gears. I can use fifth gear with no problem. Scott > ive a 90 YJ, 1.5 inch spring lift 1 inch body lift, > four banger, stock rear axel, stock manual trans, [quoted text clipped - 21 lines] > > jp ive the 2.5L and 4th is too high and third is too low, i was thinking with 32's on it it would set me right with 3rd gear without winding the motor out so bad, johnp You can stuff 32s in there, but you aren't gonna have any room in the wells without some kind of rubbing -- even highway bumps. They might solve the highway problem and use of 3rd gear though. With a Wrangler that old, the springs are probably shot anyway. Wrangler stock springs look almost flat, hardly any arch. If your springs look as though they're reversed arched when the vehicle weight is on them, then you need to replace them. Scott > ive the 2.5L and 4th is too high and third is too low, > > i was thinking with 32's on it it would set me right with 3rd gear > without winding the motor out so bad, > > johnp 3rd gear might work out for you, but I'm betting that you'll see problems with the others. You're going to be underpowered for those size tires with your gears on the road, much less when you get out on the trails. You've gotten some very good advice from these guys. If you want to go with bigger tires, you need better gear ratio and more lift to get it done and make it work right. NT > You can stuff 32s in there, but you aren't gonna have any room in the wells > without some kind of rubbing -- even highway bumps. They might solve the [quoted text clipped - 10 lines] > > > > johnp 31's are all you can run without serious rubbing. The extra tire diameter (plus new tires with tread!) will move your speed in any gear up by about 5% to 7%. should make 3rd gear a lot more comfortable. Yours should have the 4.10:1 axle. Changing gears is expensive (Figure $1200) and going to a 4.56 axle will give you an 11% change. > ive a 90 YJ, 1.5 inch spring lift 1 inch body lift, > four banger, stock rear axel, stock manual trans, [quoted text clipped - 21 lines] > > jp Remember even if you were ideally re-geared, the additional weight of the oversized tires will take about fifty more horsepower to turn at the same speeds. My Brother-in-law was ticketed for ninety in his four cylinder YJ, after installing 31" tires the top speed, down hill, with tail wind is seventy: http://www.billhughes.com/tascher/beach3.htm God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > ive a 90 YJ, 1.5 inch spring lift 1 inch body lift, > four banger, stock rear axel, stock manual trans, [quoted text clipped - 21 lines] > > jp snip > Remember even if you were ideally re-geared, the additional weight > of the oversized tires will take about fifty more horsepower to turn at > the same speeds. Old wives tale. At the same speed the additional hp to run bigger tires is negliable. They will change the effective gear ratio so you might need more hp (lower on thepower curve) but that is not what you said. So Lance Armstrong should have raced a bicycle with mountain bike tires as their weight makes no difference? God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > Old wives tale. At the same speed the additional hp to run bigger tires > is negliable. They will change the effective gear ratio so you might > need more hp (lower on thepower curve) but that is not what you said. On FLAT ground, the only difference is any difference in rolling resistance. Big tires, light vehicle, trivial difference. On up hill, same story except you have to haul the extra pounds up the hill. Extra 10 to 20 pounds per tire adds less than 100 pounds. Half the weight of your MIL. > So Lance Armstrong should have raced a bicycle with mountain bike > tires as their weight makes no difference? [quoted text clipped - 4 lines] >> is negliable. They will change the effective gear ratio so you might >>need more hp (lower on thepower curve) but that is not what you said. Or why Hot Rodders use aluminum flywheels. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > On FLAT ground, the only difference is any difference in rolling > resistance. Big tires, light vehicle, trivial difference. On up hill, > same story except you have to haul the extra pounds up the hill. Extra > 10 to 20 pounds per tire adds less than 100 pounds. Half the weight of > your MIL. But hot rodders who use aluminum flywheels want to ACCELERATE quickly. You original statement was that "oversized tires will take about fifty more horsepower to turn at the same speeds" I don't see anything in those words about ACCELERATION. You clearly said "at the same speed" Quit spreading old wives tales. > Or why Hot Rodders use aluminum flywheels. > God Bless America, Bill O|||||||O [quoted text clipped - 5 lines] >>10 to 20 pounds per tire adds less than 100 pounds. Half the weight of >>your MIL. I agree with RoyJ. I installed 31x10.5 on my 90YJ and regeared to 3.73. Cannot notice any difference in acceleration, hill climbing or top speed. Al >But hot rodders who use aluminum flywheels want to ACCELERATE quickly. >You original statement was that [quoted text clipped - 16 lines] >>>10 to 20 pounds per tire adds less than 100 pounds. Half the weight of >>>your MIL. __ Arold "Al" Green You just told me you don't have a four cylinder like the Original Poster, where fifty horsepower is the difference between being able to go faster than seventy. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > I agree with RoyJ. I installed 31x10.5 on my 90YJ and regeared to > 3.73. Cannot notice any difference in acceleration, hill climbing or > top speed. > Al Why do you think they accelerate faster? God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > But hot rodders who use aluminum flywheels want to ACCELERATE quickly. > You original statement was that [quoted text clipped - 6 lines] > > Quit spreading old wives tales. Less rotational inertia (to use bigger words than you might be able to handle). But that is NOT the issue that you spoke of earlier. You referred to "at the same speed". Get it right instead of your usual spout off. > Why do you think they accelerate faster? > God Bless America, Bill O|||||||O [quoted text clipped - 10 lines] >> >>Quit spreading old wives tales. Put your wheels on a dynamometer, and you will see it takes horsepower to maintain speed, that's how we measure horsepower: http://auto.howstuffworks.com/horsepower2.htm Moving 33,000 foot-pounds per minute. Why do you think they put aluminum rims on econo cars? God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > Less rotational inertia (to use bigger words than you might be able to > handle). But that is NOT the issue that you spoke of earlier. You > referred to "at the same speed". Get it right instead of your usual > spout off. The issue with mountain bike tires versus road bike tires has more to do with compliance than weight. That is why land speed record holders used aluminum tires rather than rubber. The weight will make acceleration more difficult, but it does not affect top speed at all. If you really want acceleration on a bike, you build one to take mountain bike wheels, but replace the fat mountain bike tires with 650mm road bike tires, like these. http://tinyurl.com/93982 The problem that most people have with these, and that prevents more universal acceptance among the lycra clad elite, is that they are very quick to respond to steering, a little too quick for most. RoyJ isn't thinking properly with respect to Jeep tires either. People run bigger tires, and reduce the tire pressure to compensate, just like you would do on a bike. Bigger tires flex more in use, dissipate more energy, and require some additional horsepower to run. But the weight has nothing to do with it. Nothing. Earle > So Lance Armstrong should have raced a bicycle with mountain bike > tires as their weight makes no difference? [quoted text clipped - 4 lines] > > is negliable. They will change the effective gear ratio so you might > > need more hp (lower on thepower curve) but that is not what you said. Hi Earle, What was your four cylinder's top speed before the heavier tires? God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > The issue with mountain bike tires versus road bike tires has more to do > with compliance than weight. That is why land speed record holders used [quoted text clipped - 13 lines] > > Earle I don't run heavier tires. As you know, most of the trails around Silverton can be negotiated with stock gear and some nerve. Earle > Hi Earle, > What was your four cylinder's top speed before the heavier tires? [quoted text clipped - 18 lines] > > > > Earle Heavy on the NERVE. I for one have backed down 1/4 mile before I could turn around. That nice little jeep a few hundred yard down in the gulley with wheels up convinced me. > I don't run heavier tires. As you know, most of the trails around Silverton > can be negotiated with stock gear and some nerve. [quoted text clipped - 47 lines] > *** Free account sponsored by SecureIX.com *** > *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com *** http://www.billhughes.com/BlackBearPassJeepWreck.jpg God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com > Heavy on the NERVE. I for one have backed down 1/4 mile before I could > turn around. That nice little jeep a few hundred yard down in the gulley > with wheels up convinced me. > http://www.billhugh Still trying to get people to visit your suck-assed website so you can log their IP, billygoat?  Signaturegburnore at DataBasix dot Com --------------------------------------------------------------------------- How you look depends on where you go. --------------------------------------------------------------------------- Gary L. Burnore | ÝÛ³ºÝ³Þ³ºÝ³³Ýۺݳ޳ºÝ³Ý³Þ³ºÝ³ÝÝÛ³ | ÝÛ³ºÝ³Þ³ºÝ³³Ýۺݳ޳ºÝ³Ý³Þ³ºÝ³ÝÝÛ³ Official .sig, Accept no substitutes. | ÝÛ³ºÝ³Þ³ºÝ³³Ýۺݳ޳ºÝ³Ý³Þ³ºÝ³ÝÝÛ³ | ÝÛ 0 1 7 2 3 / Ý³Þ 3 7 4 9 3 0 Û³ Black Helicopter Repair Services, Ltd.| Official Proof of Purchase =========================================================================== I'd agree that most people air their larger tires down to maintain a "comfortable" ride and of course the rolling resistance goes up quite a bit. But it isn't real significant compared to the Jeep's wind resistance at speed. Aerodynamics of a brick. > The issue with mountain bike tires versus road bike tires has more to do > with compliance than weight. That is why land speed record holders used [quoted text clipped - 22 lines] >>> is negliable. They will change the effective gear ratio so you might >>>need more hp (lower on thepower curve) but that is not what you said. |
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