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Discussion Starter · #1 · (Edited)

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In a bind and don't have web but have a calculator.

for a 265-70R16

265 is width in mm (convert to inches by dividing 25.4) = 10.43
70 is the percentage of the width that is the side wall height (10.43 * .70) = 7.3
Diameter of the wheel + 2 sidewalls (7.3 * 2 + 16) gives the overall height. = 30.6
 

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thank you man thats really cool and helpful
 

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Red Rock 4x4 is no longer in business and has no information at the listed address.
 

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Great Find. But. Heres the question? Will the computer have to be recaled? I just bought a 09 Sierra. Wanna go from 18's to 22's.
 

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Here are links to sites with tire size calculators.
Chart of vintage tire sizes: vintagecarconnection.com
Tire size comparator that indicates speedometer error: miata.net
Metric to standard & standard to metric conversion: redrock4x4.com
Speedo, tach, gear ratio calculator: onlineconversion.com

:biggrin:A very good tire comparison calculator: 1010tires.com
heres another metric to standard and standard to metric calc i found since redrock is gone

http://www.dakota-truck.net/TIRECALC/tirecalc.html

just dont look at the top of the page....
 

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ok so if my wheel measurements are 305/50 R20 what are they in inches? so i can put it in my programmer

---------- Post added at 05:05 PM ---------- Previous post was at 05:04 PM ----------

is it 32in???? for my question right above..
 

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Great links just found out the stock tire size the other day is 245/75/16 the tires on the truck when i bought it 2 yrs ago (which i'm gettin ready to replace) are 235/85/16 tires . I'M RUNNING 4.1 % SLOWER W / the 235/85/16's .


glad to find out the stock size & the calculator cause maybe i can get some better gas milage now going back to the stock size.


Later yall

Mack
 

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Thanks for the post. Great links
 
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