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Jeep Wrangler YJ
YJ General Discussion
Tire size vs actual speed & RPM
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<blockquote data-quote="machoheadgames" data-source="post: 428755" data-attributes="member: 18789"><p>We can't exactly answer that for you without more info. Between three different gear ratios from the factory, as well as two different stock tire sizes, we need more info. Stock tires were 27's (205) or 28's (215), which do you have? 35's usually measure around 33-34" actual so RPM will be 21% lower on a Jeep that had 205s and 18% lower on a Jeep that had 215s stock. So do the math using those percentages to figure it out. Or, a better way is to figure out your stock gears, your stock tire size, enter them into Grimmjeeper's calculator and then do comparisons leaving everything the same except for the tire size.</p><p></p><p>I would highly suggest NOT just slapping 35's on if you are considering it. They will suck the life straight out of the motor on stock gears, brakes are typically awful on 35's, steering linkage is not really strong enough for 35's, and you will definitely need to address suspension and some body lift for best results. It is expensive to do it right, and can be plain dangerous if half-assed. I'd recommend getting some nice 31's and a small lift and leave it alone. Although I still regeared for 31's because I did not like stock gears, but most don't care enough to go that far for 31's.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 428755, member: 18789"] We can't exactly answer that for you without more info. Between three different gear ratios from the factory, as well as two different stock tire sizes, we need more info. Stock tires were 27's (205) or 28's (215), which do you have? 35's usually measure around 33-34" actual so RPM will be 21% lower on a Jeep that had 205s and 18% lower on a Jeep that had 215s stock. So do the math using those percentages to figure it out. Or, a better way is to figure out your stock gears, your stock tire size, enter them into Grimmjeeper's calculator and then do comparisons leaving everything the same except for the tire size. I would highly suggest NOT just slapping 35's on if you are considering it. They will suck the life straight out of the motor on stock gears, brakes are typically awful on 35's, steering linkage is not really strong enough for 35's, and you will definitely need to address suspension and some body lift for best results. It is expensive to do it right, and can be plain dangerous if half-assed. I'd recommend getting some nice 31's and a small lift and leave it alone. Although I still regeared for 31's because I did not like stock gears, but most don't care enough to go that far for 31's. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Tire size vs actual speed & RPM
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