Tire Question (second opinion)
Senior User
Joined: May 2004
Posts: 191
Likes: 0
From: San Diego, CA
Originally Posted by 02Ford150
Looking for info about switching from 255/70R/16 to 265/75R/16. Any adjustments need to be done...
Thanks
Thanks
Check this link. Your speedo will be 5% slow and you will have a 5% reduction in power. Not much but you will notice it.
New User
Joined: Jan 2007
Posts: 18
Likes: 0
Nah the tire will fit good. The speedo will be off. this is a commen switch i see people do on their tires
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Senior User
Joined: Mar 2007
Posts: 134
Likes: 1
i switched from stock 245's to 265's with no problems and accordin' to my speedin' tickets, my speedo is bang on...maybe it was off to begin with...lol
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Elder User
Joined: Aug 2006
Posts: 642
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From: Olathe, KS
Speedos are typically about 5% off from the factory. I believe there a fed law governing. The idea is for you believe you are going faster than you really are. Usually one size larger will put on target. Regardless, it will impact the speedo/od as noted. Mileage calcuation will change. Bust most importantly is the ticket factor. 80 mph becomes 80. not 76 per the 5% rule. my 98 with 285x70x17s are spot on by GPS.
New User
Joined: Jan 2007
Posts: 18
Likes: 0
If you need to know how much your speedo will be off at certin speed you can visit our tire caculator here. It will give you the different speed and tell you how much bigger or smaller your new tires are from your current
http://www.discounttire.com/dtcs/infoTireMath.dos
http://www.discounttire.com/dtcs/infoTireMath.dos
