# How much is my speedometer off? **URL:** \ **Category:** Shift518 Automotive\ **Created:** [February 10, 2009, 12:36pm UTC](https://forums.speedlife.net/t/how-much-is-my-speedometer-off/241990 "2009-02-10T12:36:06Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![PJB](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pjb/32/6389_2.png) [@PJB](https://forums.speedlife.net/u/PJB)\ **Post date:** [February 10, 2009, 12:36pm UTC](https://forums.speedlife.net/t/how-much-is-my-speedometer-off/241990/1 "2009-02-10T12:36:06Z")
Stock size tires are 235/75/17 and the tires on it now are 265/70/17. How much of a difference in mph does that make and does it make the speed faster or slower? ---
**Author:** ![GranMassaX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/granmassax/32/6299_2.png) [@GranMassaX](https://forums.speedlife.net/u/GranMassaX)\ **Post date:** [February 10, 2009, 12:42pm UTC](https://forums.speedlife.net/t/how-much-is-my-speedometer-off/241990/2 "2009-02-10T12:42:18Z")
[http://www.bigcustomwheels.com/rt\_specs.jsp](http://www.bigcustomwheels.com/rt_specs.jsp) “When speedometer reads 60mph (96.6km/h) actual speed will be 61.5mph (99km/h): 2.5% faster.” ---
**Author:** ![PJB](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/pjb/32/6389_2.png) [@PJB](https://forums.speedlife.net/u/PJB)\ **Post date:** [February 10, 2009, 12:44pm UTC](https://forums.speedlife.net/t/how-much-is-my-speedometer-off/241990/3 "2009-02-10T12:44:51Z")
Thanks. > When speedometer reads 60mph (96.6km/h) actual speed will be 61.5mph (99km/h): 2.5% faster. No big deal then. I just noticed how many people were passing me when I set the cruise at 60 in a 55 zone on the northway today. I cant afford a ticket so Im not going to drive fast thru there because theres usually tons of cops there.