Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Jeep Wrangler YJ
YJ General Discussion
31" or 30" tires?
Reply to thread
Message
<blockquote data-quote="machoheadgames" data-source="post: 427791" data-attributes="member: 18789"><p>For some reason the charts never show it but the math works out to be good enough that 43 tooth is proper for 31’s and 4.88. It’s a very similar setup to 5.13/33.</p><p></p><p>I’ve tested a bunch of gears and it seems that typically, I’ve found each speedo gear tooth to make a difference of about 3 mph. So typically you can end up right on the money, or 1 high or 2 mph low. By the time you reach 3 mph off you go to the next gear. So there’s pretty much always a gear you can use to be really close, unless of course you go so low that you’re off the chart (44+ tooth). At that point, it’s time to wire in a converter module to correct the electrical input the Speedo sees from the sensor, which can be calibrated to work perfectly regardless of what gear you install.</p><p></p><p>If running a 91 or earlier Jeep with a cable speedo, time to buy an electric or GPS speedo, or give up on being perfectly calibrated lol.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 427791, member: 18789"] For some reason the charts never show it but the math works out to be good enough that 43 tooth is proper for 31’s and 4.88. It’s a very similar setup to 5.13/33. I’ve tested a bunch of gears and it seems that typically, I’ve found each speedo gear tooth to make a difference of about 3 mph. So typically you can end up right on the money, or 1 high or 2 mph low. By the time you reach 3 mph off you go to the next gear. So there’s pretty much always a gear you can use to be really close, unless of course you go so low that you’re off the chart (44+ tooth). At that point, it’s time to wire in a converter module to correct the electrical input the Speedo sees from the sensor, which can be calibrated to work perfectly regardless of what gear you install. If running a 91 or earlier Jeep with a cable speedo, time to buy an electric or GPS speedo, or give up on being perfectly calibrated lol. [/QUOTE]
Verification
Post reply
Forums
Jeep Wrangler YJ
YJ General Discussion
31" or 30" tires?
Top
Bottom