# Tires and sizing **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [May 11, 2007, 6:34pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168 "2007-05-11T18:34:46Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Clean\_Baldy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/clean_baldy/32/7308_2.png) [@Clean\_Baldy](https://forums.speedlife.net/u/Clean_Baldy)\ **Post date:** [May 11, 2007, 6:34pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/1 "2007-05-11T18:34:46Z")
The stock tires on my car are 215/45/ZR18 This isn’t the most standard 18" tire, so they are very expensive. I was looking into a tire calculator and a 225/40/18 (cheaper) will give me a 2% difference in the speedometer. Do you think it’ll be that big of an issue? The stock 18" wheel for the MS6 is only 7" wide. A 225 should fit, I’d imagine. I had 225 wide tires on my regular 6, and it also had 7" wide wheels. Comments? 🙂 ![http://www.jonrosensystems.net/files/Jeff/pics/tirescompared.JPG](http://www.jonrosensystems.net/files/Jeff/pics/tirescompared.JPG) ---
**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:** [May 11, 2007, 6:54pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/2 "2007-05-11T18:54:12Z")
[http://www.nyspeed.com/forums/showthread.php?t=30433](http://www.nyspeed.com/forums/showthread.php?t=30433) 225s will fit on a 5.5" wide wheel ---
**Author:** ![Clean\_Baldy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/clean_baldy/32/7308_2.png) [@Clean\_Baldy](https://forums.speedlife.net/u/Clean_Baldy)\ **Post date:** [May 11, 2007, 6:55pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/3 "2007-05-11T18:55:52Z")
Sadly, they’ve gotta be 93 rating. Apparently the MS6 has a fat ass… ---
**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:** [May 11, 2007, 7:04pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/4 "2007-05-11T19:04:34Z")
And you really think that 3% difference in load rating by using a 92 is really going to make a diffence. I highly doubt that you operate anywhere near the GVWR of 4552 lbs. So the real question is how often do you pack your car with 963 lbs of stuff? ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [May 11, 2007, 11:31pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/5 "2007-05-11T23:31:01Z")
yah umm it doesn’t matter…from working at a tire place i hate ppl that think even a 5% change will make a difference…it won’t ! think about how much a tire changes just from burning off the tread! thats about 1/2 inch at least in tread! stock size on my car…275/40/18…on it now…285/35/18…on new rims…315/35/18’s …doesn’t change much maybe 5mph at 60 ? you can either get used to it or pay extra money for a weird stock size…go for the 225/40’s maybe even a 235/40 ---
**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:** [May 12, 2007, 6:09am UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/6 "2007-05-12T06:09:38Z")
[quote=“ultradriver10000,post:5,topic:29168"”] … **from working at a tire** place … … think about how much a tire changes just from burning off the tread! thats about **1/2 inch at least** in tread! [/quote] You work at a tire place and you don’t know that passenger car tire tread depth is molded at 10/32nds? 10/32nds =! 1/2 an inch. Furthermore NYS law recomends 2/32nds so the maxima difference is 8/32nds from new to properly warn. That is a 1/4 deviation, for an OE difference in wheel speed from new to properly worn of 1.978679…% ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [May 12, 2007, 10:57am UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/7 "2007-05-12T10:57:20Z")
true but everyone doesn’t stop at 2/32’s either…amd sorry about that i was also including truck tires into my assumption…also there would be a 1/4 loss on top and bottom therefore reducing the overall tire hieght by what ? 8/32’s on top added to 8/32’s on bottom giving you a total loss of 16/32 or 1/2 sorry i reduced it ---
**Author:** ![Clean\_Baldy](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/clean_baldy/32/7308_2.png) [@Clean\_Baldy](https://forums.speedlife.net/u/Clean_Baldy)\ **Post date:** [May 12, 2007, 11:02am UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/8 "2007-05-12T11:02:35Z")
so, as you two decide to confuse me more with your #/32 talk… I think I got out of it that yes, indeed, I should just go for the 225/40. I’d love to go 235/40 but they’ll rub. Thanks for the info. ---
**Author:** ![05OrangeSS](https://avatars.discourse-cdn.com/v4/letter/0/eada6e/32.png) [@05OrangeSS](https://forums.speedlife.net/u/05OrangeSS)\ **Post date:** [May 12, 2007, 7:11pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/9 "2007-05-12T19:11:01Z")
[quote=“Clean Baldy,post:8,topic:29168"”] so, as you two decide to confuse me more with your #/32 talk… I think I got out of it that yes, indeed, I should just go for the 225/40. I’d love to go 235/40 but they’ll rub. Thanks for the info. [/quote] I have 235/40/18’s on my stock cobalt wheels…they are 7’ wide…I dont see why you couldnt use that size…unless it rubs your inner fender ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [May 12, 2007, 10:32pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/10 "2007-05-12T22:32:20Z")
hahaha them 225/40’s should be great and a lil wider too ---
**Author:** ![newman](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/newman/32/7569_2.png) [@newman](https://forums.speedlife.net/u/newman)\ **Post date:** [May 12, 2007, 10:59pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/11 "2007-05-12T22:59:02Z")
seven feet, huh? ---
**Author:** ![05OrangeSS](https://avatars.discourse-cdn.com/v4/letter/0/eada6e/32.png) [@05OrangeSS](https://forums.speedlife.net/u/05OrangeSS)\ **Post date:** [May 13, 2007, 7:28pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/12 "2007-05-13T19:28:18Z")
[quote=“newman,post:11,topic:29168"”] seven feet, huh? [/quote] that’s how I roll…naw i meant inches obviously… ---
**Author:** ![ZOMGVTEK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/zomgvtek/32/5063_2.png) [@ZOMGVTEK](https://forums.speedlife.net/u/ZOMGVTEK)\ **Post date:** [May 13, 2007, 8:48pm UTC](https://forums.speedlife.net/t/tires-and-sizing/29168/13 "2007-05-13T20:48:07Z")
[quote=“05OrangeSS,post:12,topic:29168"”] that’s how I roll…naw i meant inches obviously… [/quote] It is easier to do ’ vs " But… i go for the " so i dont get hassled…