# suspension/tire questions **URL:** \ **Category:** Shift518 Automotive\ **Created:** [July 9, 2011, 6:32am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329 "2011-07-09T06:32:08Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [July 9, 2011, 6:32am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/1 "2011-07-09T06:32:08Z")
I have across a interesting suspension analysis that seemed to be real thorough, but much of the data was based on or derived from this graph: ![http://rejsa.nu/im/_garage/1723-new_2009-10-15-1_tire.jpg](http://rejsa.nu/im/_garage/1723-new_2009-10-15-1_tire.jpg) The author admits that this graph is from one specific type of tire (a rather old one) but he suggests that most tires are similar enough to use this data. My question is what variables could change this graph and how would it change? I expect that a narrow tire would have a narrower curve (a steeper drop off of traction above 0 and below -3), and that tires with more flexible sidewalls might have a wider area of traction at the top of the curve, tires of a stickier compound would simply bump the graph up to higher G’s These are all guesses but if anyone good info on this I’d love to study it a bit more. Especially if anyone knows what would move the entire graph to the left or right, in other words, in what situation or environment would more or less camber provide with more grip? ---
**Author:** ![SRS\_BZNS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/srs_bzns/32/6375_2.png) [@SRS\_BZNS](https://forums.speedlife.net/u/SRS_BZNS)\ **Post date:** [July 9, 2011, 6:51am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/2 "2011-07-09T06:51:53Z")
I would also think that tread pattern design would have a lot to do with the curve of the graph also. Shitty tread pattern on the inside of the tire is definitely going to affect grip in the -2\* and lower section of the graph ---
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [July 9, 2011, 7:24am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/3 "2011-07-09T07:24:20Z")
> [@FS: 96 saturn SL2](https://forums.speedlife.net/t/fs-96-saturn-sl2/40748/16): > > I would also think that tread pattern design would have a lot to do with the curve of the graph also. Shitty tread pattern on the inside of the tire is definitely going to affect grip in the -2\* and lower section of the graph ah, good point. Especially asymmetrical tread patterns I assume. ---
**Author:** ![RocketPunch](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rocketpunch/32/6429_2.png) [@RocketPunch](https://forums.speedlife.net/u/RocketPunch)\ **Post date:** [July 9, 2011, 9:27am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/4 "2011-07-09T09:27:19Z")
Graph does not specify how the CoF is measured. Is it perfectly perpendicular to the rotation axis or with some kind of slip? Some variable off my mind would be speed, slip angle, road camber, surface traction, tire compound, tread design and tire construction. PS. Take a look at the book RCVD by Milliken, you should find all your answers there. Enjoy. ---
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [July 9, 2011, 9:48am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/5 "2011-07-09T09:48:59Z")
> [@FS: 1998 Chrysler Intrepid ES](https://forums.speedlife.net/t/fs-1998-chrysler-intrepid-es/26686/20): > > Graph does not specify how the CoF is measured. Is it perfectly perpendicular to the rotation axis or with some kind of slip? > > Some variable off my mind would be speed, slip angle, road camber, surface traction, tire compound, thread design and tire construction. > > PS. Take a look at the book RCVD by Milliken, you should find all your answers there. Enjoy. I spent all day yesterday trying to find that book for less than $85 ☹ ---
**Author:** ![RocketPunch](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rocketpunch/32/6429_2.png) [@RocketPunch](https://forums.speedlife.net/u/RocketPunch)\ **Post date:** [July 9, 2011, 10:23am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/6 "2011-07-09T10:23:33Z")
> [@Mafdark"](#): > > I spent all day yesterday trying to find that book for less than $85 ☹ A new one is $100. I say spend the extra $15 and be done with it. There is a reason why there are no used copies… ---
**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\ **Post date:** [July 9, 2011, 4:34pm UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/7 "2011-07-09T16:34:04Z")
I have a copy at the shop somewhere in the collection. I’ll see if I can dig it out this week for you to borrow. ---
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [July 10, 2011, 9:49am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/8 "2011-07-10T09:49:19Z")
Finally ordered the book. Nice new hard cover. btw. the article I was reading was this one: [http://rejsa.nu/forum/viewtopic.php?t=60154](http://rejsa.nu/forum/viewtopic.php?t=60154) ---
**Author:** ![RocketPunch](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rocketpunch/32/6429_2.png) [@RocketPunch](https://forums.speedlife.net/u/RocketPunch)\ **Post date:** [July 10, 2011, 11:18am UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/9 "2011-07-10T11:18:04Z")
> [@Pull!](https://forums.speedlife.net/t/pull/43753/37): > > Finally ordered the book. Nice new hard cover. > > btw. the article I was reading was this one: [rejsa.nu :: Chassianalys av Ferrari 355](http://rejsa.nu/forum/viewtopic.php?t=60154) Man, if you find that kind of stuff interesting, you will have so much fun (and pounding headaches) reading that book. Enjoy! :pop ---
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [July 10, 2011, 4:08pm UTC](https://forums.speedlife.net/t/suspension-tire-questions/259329/10 "2011-07-10T16:08:04Z")
> [@Hacking](https://forums.speedlife.net/t/hacking/43779/21): > > Man, if you find that kind of stuff interesting, you will have so much fun (and pounding headaches) reading that book. Enjoy! :pop :excited