# Tire/Rim question **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [October 3, 2006, 4:45pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420 "2006-10-03T16:45:30Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Boomin99GT](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boomin99gt/32/7306_2.png) [@Boomin99GT](https://forums.speedlife.net/u/Boomin99GT)\ **Post date:** [October 3, 2006, 4:45pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420/1 "2006-10-03T16:45:30Z")
Not sure if this was the right forum so I apologize in advance if its not. I have 18’s on my car right now that have 225/40 tires on them. My stock 16’s weigh about the same as my 18’s I believe. My 16" wheels are 6.5" wide and my 18’s are 7.5" Wide. Now which would be better for the track? I know the 18" wheels have a greater rotational mass but they’re also wider so maybe better for traction? I’m going to try and find a wider 16" wheel to put some good tires on once I start spraying but for now I’m going to use what I have. Thanks guys -Tom ---
**Author:** ![Rx3](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rx3/32/7194_2.png) [@Rx3](https://forums.speedlife.net/u/Rx3)\ **Post date:** [October 3, 2006, 5:00pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420/2 "2006-10-03T17:00:27Z")
What kind of track? Drag racing track? Road Racing Track? ---
**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\ **Post date:** [October 3, 2006, 5:01pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420/3 "2006-10-03T17:01:58Z")
Sounds like drag racing to me. You dont spray on road courses, and you dont usually worry about straight line acceleration (I garuntee he isnt talking about lateral). ---
**Author:** ![fairgentleman\_Z](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fairgentleman_z/32/7263_2.png) [@fairgentleman\_Z](https://forums.speedlife.net/u/fairgentleman_Z)\ **Post date:** [October 3, 2006, 5:04pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420/4 "2006-10-03T17:04:51Z")
For what kind of track? Assuming 225s in both cases (16/18). The 16s would be better for drag racing, and road course. The wheel width is really neglegible for a 225. Not only are 18’s heavier, but the mass is farther from the center, causing a greater moment of inertia. In the case of road course/auto-x, I’ve seen 225s mounted on 5.5" wide rims. Not idea, but it does work. For a soft sidewall street tire, there may be more performance with the taller rim in twisties. Just because they will probably need a lower aspect ratio to maintain the same rolling diameter. Lower aspect ratio = stiffer side wall = higher slip ratios = higher lateral loading per given smaller slip angle (to a point). ---
**Author:** ![Boomin99GT](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boomin99gt/32/7306_2.png) [@Boomin99GT](https://forums.speedlife.net/u/Boomin99GT)\ **Post date:** [October 3, 2006, 5:18pm UTC](https://forums.speedlife.net/t/tire-rim-question/18420/5 "2006-10-03T17:18:46Z")
Yeah sorry its for 1/4 mile racing. Now that my wife is working I have money again to start modding my car and since all my toys are on the way I need to go get a baseline run in and am trying to decide which rims I should have on my car.