# Tire guys need help with size **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [August 15, 2008, 11:37am UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301 "2008-08-15T11:37:25Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![baseball24](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/baseball24/32/7452_2.png) [@baseball24](https://forums.speedlife.net/u/baseball24)\ **Post date:** [August 15, 2008, 11:37am UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/1 "2008-08-15T11:37:25Z")
I tried looking this up but i think i know the size of tire i can run but i was just making sure before i order them… i have a 17 X 8.5 rim and the tires on there currently are 245/45/17. what is the biggest size that i can run safely. I was looking at 255/40/17 because i can get a cheap price but can i go any bigger? ---
**Author:** ![focusinprogress](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/focusinprogress/32/7227_2.png) [@focusinprogress](https://forums.speedlife.net/u/focusinprogress)\ **Post date:** [August 15, 2008, 11:41am UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/2 "2008-08-15T11:41:38Z")
here: This website kicks SO MUCH ASS when it comes to aftermarker tire and wheel sizing. > **[Tire Size Calculator - Tire and Wheel Plus Sizing](https://www.1010tires.com/Tools/Tire-Size-Calculator)** > > 1010tires.com Tire Size calculator. Use our tire calculator to compare tire sizes based on tire diameter, radius, sidewall height, circumference, revs per mile and speedometer difference. you can compare up to 4 tire sizes, or stock +3 others to see what percentage the ratio is off by ---
**Author:** ![sureshot007](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot007/32/7345_2.png) [@sureshot007](https://forums.speedlife.net/u/sureshot007)\ **Post date:** [August 15, 2008, 12:19pm UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/3 "2008-08-15T12:19:54Z")
275/40/17! 🙂 ---
**Author:** ![baseball24](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/baseball24/32/7452_2.png) [@baseball24](https://forums.speedlife.net/u/baseball24)\ **Post date:** [August 15, 2008, 8:06pm UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/4 "2008-08-15T20:06:44Z")
will 275/40/17 fit ? the rims a c 5 corvette rim ---
**Author:** ![sureshot007](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sureshot007/32/7345_2.png) [@sureshot007](https://forums.speedlife.net/u/sureshot007)\ **Post date:** [August 15, 2008, 8:16pm UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/5 "2008-08-15T20:16:18Z")
they fit on my 17x8.5’s ---
**Author:** ![Deathproof](https://avatars.discourse-cdn.com/v4/letter/d/dec6dc/32.png) [@Deathproof](https://forums.speedlife.net/u/Deathproof)\ **Post date:** [August 16, 2008, 10:20am UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/6 "2008-08-16T10:20:41Z")
I had 285/40r17s on my 17x8s and I’ve even seen 315/35r17s on 17x9s. 275/40r17s will be totally fine, a little bit of bulge but nothing crazy. ---
**Author:** ![baseball24](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/baseball24/32/7452_2.png) [@baseball24](https://forums.speedlife.net/u/baseball24)\ **Post date:** [August 16, 2008, 11:15am UTC](https://forums.speedlife.net/t/tire-guys-need-help-with-size/53301/7 "2008-08-16T11:15:12Z")
ya i want the tires to stick out out a little bit more because the 245 are just about flush with the rim… i think 275’s will be ordered in the next week or so and off to swerve