You guys really go for the high end stuff. I used Laramie TrailCutter RT and APs (I run 4 RTs in the winter and two AP up front the rest of the year) in this size on my TJ and they cost about $260-280 a set mounted (from my sources). These were the high end for Laramie. Many lower scale tires were available from around $35-38.
For $600 (for 4) I can get BFG AT in 33x9.50. Given that BFG is a "priced fixed" tire ...so can all of you.
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is 2.1% slower than the 225. When your speedo reads 60 mph, you are actually travelling 61.3 mph.
This is true in that the number of "pulses" generated by the VSS will only vary that amount. On a Jeep you actually have a gear driven VSS. That is, my 02 SE (which came with 205/75 and a 29 tooth speedo gear) has an error of about 4 mph at lower speeds (according to a GPS)...yet the 235/75 tire is only about .2" different than the 30x9.5r15 tire. The axle ratios are the same (3.73) ..yet the same 34 tooth gear (OEM 30" tire package and 3.73 gears) doesn't generate the same MPH.
That is, since it's a gear driven VSS ..it HAS to have some error to it inherently. The accuracy can only be to +/- 1/2 the next significant tooth in either direction (28.5 teeth to 29.5 teeth). If you're lucky the tooth count is dead on with the tire you're putting on. As the tooth count climbs ..it has less impact (1/34th difference as opposed to 1/29th difference).
There's also the issue that I haven't been able to determine if the odometer and the speedo are directly connected. Sure I know that they both read integrated data from the PCM (8000 pulses per mile) ..but the speedo is an analog needle ..the odo digital. That is, who's to say that the indicated mph is actually what the PCM is generating? Now you can modify the speedo reading with the DRBII scanner tool ...but no one seems to know if it also modifies the ODO reading as well.
There will be only good side effects from this tire. If it's a 4.0 ..you'll only notice a better ride. If it's a 4 banger ..you'll noitce that when you let off the gas at high speed that you've lost the magic parachute that opens up with smaller tires (better rotating mass). You're still paying for it ..but the 235/75 is the tallest and skinniest tire you can practically put on it. All the nice pizza cutters are available to the Euros and the Aussies.
[ May 02, 2004, 11:05 AM: Message edited by: Gary Allan ]