Tires and speedometer
I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel
wheels and tires. Does my speedometer need to be adjusted? Has anyone done this? Tom |
Re: Tires and speedometer
Jeep speedometers generally read slow stock, you are probably closer to the
correct reading now than before. (but still slow) "tk" <thomas_kessler@comcast.net> wrote in message news:1169848358.200219.234310@j27g2000cwj.googlegr oups.com... >I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
Jeep speedometers generally read slow stock, you are probably closer to the
correct reading now than before. (but still slow) "tk" <thomas_kessler@comcast.net> wrote in message news:1169848358.200219.234310@j27g2000cwj.googlegr oups.com... >I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
Jeep speedometers generally read slow stock, you are probably closer to the
correct reading now than before. (but still slow) "tk" <thomas_kessler@comcast.net> wrote in message news:1169848358.200219.234310@j27g2000cwj.googlegr oups.com... >I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
Jeep speedometers generally read slow stock, you are probably closer to the
correct reading now than before. (but still slow) "tk" <thomas_kessler@comcast.net> wrote in message news:1169848358.200219.234310@j27g2000cwj.googlegr oups.com... >I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
You need to find a measured mile or use a GPS to see what it is now. I
have found that Jeep speedometers are calibrated for the largest stock tire size so yours might be right on now. Our XJ's became right on with 235's which are almost 30" tall. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) tk wrote: > I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
You need to find a measured mile or use a GPS to see what it is now. I
have found that Jeep speedometers are calibrated for the largest stock tire size so yours might be right on now. Our XJ's became right on with 235's which are almost 30" tall. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) tk wrote: > I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
You need to find a measured mile or use a GPS to see what it is now. I
have found that Jeep speedometers are calibrated for the largest stock tire size so yours might be right on now. Our XJ's became right on with 235's which are almost 30" tall. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) tk wrote: > I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
You need to find a measured mile or use a GPS to see what it is now. I
have found that Jeep speedometers are calibrated for the largest stock tire size so yours might be right on now. Our XJ's became right on with 235's which are almost 30" tall. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) tk wrote: > I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
Re: Tires and speedometer
I think your speedo will read SLOW now. When it reads 60, yoiur actual speed
will be 65, for example. (You'll need to take measurements to arrive at the actual error.) Your original tires were about 26.5 inches in diameter, the new tires will be closer to 29.5. This gives a diameter increase of about 3 inches, which will give a circumference increase of around 9 inches. You will need to calibrate the speedo as a result. It ought to be as easy as swapping a gear on the speed sensor in the transmission, or wherever they mounted the sensor on your truck. "tk" <thomas_kessler@comcast.net> wrote in message news:1169848358.200219.234310@j27g2000cwj.googlegr oups.com... >I upgraded to alum canyon wheels and 30" tires from 195/75R15 steel > wheels and tires. Does my speedometer need to be adjusted? > > Has anyone done this? > > Tom > |
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