Calculating Tire Size
#16
2610 is the unloaded (i.e. perfectly round) circumference.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
Last edited by shotgunz; 01-05-2011 at 04:29 PM.
#17
2610 is the unloaded (i.e. perfectly round) circumference.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
#18
The truck speedometer will always be about 2 mph faster than the digital readout. Ford builds them that way. Get you digital readout calibrated to a GPS to make sure you have it correct.
__________________
Jim
Jim
#20
#21
lol i'll just have the cop in my town use his radar to check it. i can get by with warnings by saying the tires have my gauges off, the cop just says have it flashed and heres your free pass be glad im in a good mood. lol works about 95% of the time. and we took my gf's g6 on a trip and took the garmin and the garmin always read 3-4 mph lower than her gauges and its bone stock with the same tires it came with from the factory. so maybe i shouldnt rely on my gps
#22
#23
hi shotgunz,
thanks for providing the tire size calculator. i will really help many users at this forum.
you did really a good job.
Thanks
9xm live tv
thanks for providing the tire size calculator. i will really help many users at this forum.
you did really a good job.
Thanks
9xm live tv
Last edited by Bothom; 10-01-2012 at 09:45 AM.
#24
Here is imo the best tire size calculator I have found. Let's u put in stock size and compare up to 3 prospective sizes. Check it out.
www.1010tires.com
www.1010tires.com
#26
2610 is the unloaded (i.e. perfectly round) circumference.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
Tires are not perfectly round. When loaded, they squish (anywhere from 2-5%). This reduces the effective diameter.
Thus you need to reduce the unloaded diameter by multiplying the unloaded diameter by .98, .97, or .96, etc. as a starting point. Then you need to confirm/verify with a known speed (i.e., GPS) or distance (Google maps) and adjust based on the percentage of your error.
Can someone tell me what nimber they are using for 295/70/18 Trail Grapps. I had my truck broken into and my GPS unit stolen. My cell phone has a GPS unit, but it doesnt have and odometer.
Thanks
#28
#30
Your question would best be asked in a new thread in the Wheel and Tire forum.. It is a little off subject in this thread, plus may not be seen by many.
__________________
Jim
Jim