67vette435 Posted January 23, 2008 Report Share Posted January 23, 2008 This is my plain, I want to purchase (2) 18x10 black bullets with polished lips for the rear of my SGT. Im wondering what tire size to purchase. I want to try to keep it the same brand Bf goodrich G-force. Any help would be grealty appreciated. This is my first post. I bought #4835 blk/blk 5spd. Link to comment Share on other sites More sharing options...
LuLu Posted January 24, 2008 Report Share Posted January 24, 2008 This is my plain, I want to purchase (2) 18x10 black bullets with polished lips for the rear of my SGT. Im wondering what tire size to purchase. I want to try to keep it the same brand Bf goodrich G-force. Any help would be grealty appreciated. This is my first post. I bought #4835 blk/blk 5spd. I haven't run across an 18X10 Bullitt wheel, chome, satin, or black, greater than 8.5" wide. If you're on to something, please clue me in? If you find a set, the largest tire this wheel will accommodate safely on the SGT is a 315 wide. A word of caution...Keep your front/rear tire circumfrence as close to each other as possible, otherwise, you will trigger traction control warnings, which also affect your EEC. I think the acceptable range of tolerance is under 1.0" OD, but it's been a while since I researched this. Example: Our stock SGT tire is a 235/50-18 on an 8.5" wide wheel. Increase that wheel width to 10" wide will make the OD of the tire 27.25" tall. A 255/50-18 tire on the same rim will have an OD of 28.04" tall, which should not be a problem with the Traction Control sensors that count wheel RPMs at each wheel. However, a 275/35-18 tire on the same 10" wheel will have an OD of 25.58 tall, and this will trigger a traction control warning, and you'll have to sut it off manually every time you start the car. Maybe this will help you in your search? When this site replies with a calculation, it is based on the widest wheel recommended for the tire size you ask about. http://www.wallaceracing.com/tire-aspect-calc.php Happy motoring! Link to comment Share on other sites More sharing options...
67vette435 Posted January 24, 2008 Author Report Share Posted January 24, 2008 They are shelby torq thrust 18x10 black with machined lips. They have them on tirerack.com. $239/each So from what you told me based on 235/50/18 (27.25 stock overall diameter). 9.25 wide 285/40/18= 26.98 OD and 11.22 Wide 275/40/18=26.66 OD and 10.83 Wide 305/35/18=26.41 OD and 12.01 Wide 315/35/18=26.68 OD and 12.4 Wide Would any of these be ok. whats the best choice? thanks Link to comment Share on other sites More sharing options...
LuLu Posted January 24, 2008 Report Share Posted January 24, 2008 Nevermind... Link to comment Share on other sites More sharing options...
Sargie Posted January 24, 2008 Report Share Posted January 24, 2008 Nevermind... I put 18" X 10" Redlines on my SGT with BFG KDWS 285/40-18"s'. No warnings or TCS lights. HTH, Rich Link to comment Share on other sites More sharing options...
Alloy Dave Posted January 24, 2008 Report Share Posted January 24, 2008 I put 18" X 10" Redlines on my SGT with BFG KDWS 285/40-18"s'. No warnings or TCS lights. HTH, Rich But did you use that size on the rear only or on all 4 corners? I believe he was talking about DIFFERENTIAL between front and rear circumference. Link to comment Share on other sites More sharing options...
STLShelby Posted January 24, 2008 Report Share Posted January 24, 2008 This what your looking for? I had 10.5's in 17's on the back of my Mach with 315's. I think 295's would be a good fit for 10's, although 315's would work fine also. http://www.americanmuscle.com/black-2005-d...18x9-18x10.html Link to comment Share on other sites More sharing options...
67vette435 Posted January 24, 2008 Author Report Share Posted January 24, 2008 I will try to make this more clear. SORRY.I am keeping the front wheels and tires stock. I just want to add 18x10 in the back. What tire size would be ok? to match the front height so nothing would go wrong. so far sounds like 285/40/18 Link to comment Share on other sites More sharing options...
LuLu Posted January 24, 2008 Report Share Posted January 24, 2008 I will try to make this more clear. SORRY.I am keeping the front wheels and tires stock. I just want to add 18x10 in the back. What tire size would be ok? to match the front height so nothing would go wrong. so far sounds like 285/40/18 Okay, I'm back with more 411. I changed my previous post here because I needed to do some more research. Here's what I found. Yes, there are 18X10 Bullitt wheels available as you stated in your opening post. Took me a while to pull them up, but they are there and not expensive. I know you said you are planning on keeping your front tires, but if you do, you're not going to get the best bang for your buck. You're not hurting yourself, but for just a few more dollars, you can do a lot better. Remember, control is power, and your control is in your tire contact patch and no where else. I don't care what suspension goodies are involved, if tires don't stick, you get slick. So, consider this combo? Front tires...255/50-18 = 28.04 OD--No wheel change required Rear tires...305/45-18 = 28.81 OD--10" wide wheels required. No traction control issues, no spacers, a lot more meat on the blacktop, and just a hint of "old school" rake. Happy motoring. Link to comment Share on other sites More sharing options...
Pastor Passum Posted January 24, 2008 Report Share Posted January 24, 2008 Okay, I'm back with more 411. I changed my previous post here because I needed to do some more research. Here's what I found. Yes, there are 18X10 Bullitt wheels available as you stated in your opening post. Took me a while to pull them up, but they are there and not expensive. I know you said you are planning on keeping your front tires, but if you do, you're not going to get the best bang for your buck. You're not hurting yourself, but for just a few more dollars, you can do a lot better. Remember, control is power, and your control is in your tire contact patch and no where else. I don't care what suspension goodies are involved, if tires don't stick, you get slick. So, consider this combo? Front tires...255/50-18 = 28.04 OD--No wheel change required Rear tires...305/45-18 = 28.81 OD--10" wide wheels required. No traction control issues, no spacers, a lot more meat on the blacktop, and just a hint of "old school" rake. Happy motoring. Thanks Lulu, err Ret. Mac...oh yeah Sgt4729. Confusing, I scroll down to make sure it's you (lulu) when I read your posts. Old habits die hard. Anyway, I'm planning to go to 18x10 rear and probably 18x9 front bullitts soon and I really appreciate your knowledge and willingness to share that knowledge with us less informed. That's what makes these forums so great. Hope you're enjoying your retirement. Jim Link to comment Share on other sites More sharing options...
67vette435 Posted January 24, 2008 Author Report Share Posted January 24, 2008 I just looked at a picture of 305/45/18's on a gt500 and they look tall, that was on stock ride height. Are you sure they wont rub on are sgt's. Thanks again for your help. Thats why i joined teamshelby great people and great cars. Link to comment Share on other sites More sharing options...
LuLu Posted January 24, 2008 Report Share Posted January 24, 2008 I just looked at a picture of 305/45/18's on a gt500 and they look tall, that was on stock ride height. Are you sure they wont rub on are sgt's. Thanks again for your help. Thats why i joined teamshelby great people and great cars. Normally, I would say yes across the board, they will fit. But, I don't know much about the GT 500 rear suspension, where and how it sits suspension wise. I know the 305/45 will deliver that "stuffed" appearance with our ground effects cladding at play, but the wheel wells are very generous. I also do not know if SGT 'verts cut into this area. I'd have to get a look at one on a rack before I can yes to them. Link to comment Share on other sites More sharing options...
CudaFly Posted January 25, 2008 Report Share Posted January 25, 2008 I just looked at a picture of 305/45/18's on a gt500 and they look tall, that was on stock ride height. Are you sure they wont rub on are sgt's. Thanks again for your help. Thats why i joined teamshelby great people and great cars. If you are going with 305's you should consider installing an adjustable panhard rod first. With the SAI installed FRPP lowering kit the back end of the car shifts about 1/4" - 5/8" to the right. Most importantly you need the right offset and backspacing on the wheels. The American Racing Shelby Torq-Thrust M 18x10 wheels with 45mm offset and 7 1/4” backspacing are a perfect fit. The 18x9's with 34mm offset and 6 1/3” backspacing are good on the front. I'm running with 295's and they fit (tight) but there is a noticeable difference with the wheel well clearance between the right and left tires. Without the panhard bar the 305's might rub the inside of the wheel well. I'll be installing an adjustable BMR panhard rod within the next couple of weeks just to even out the backend: http://www.bmrfabrication.com/phr/panhardRods-Large.jpg Good Luck... Link to comment Share on other sites More sharing options...
savage1969 Posted January 25, 2008 Report Share Posted January 25, 2008 I'm running with 295's and they fit (tight) but there is a noticeable difference with the wheel well clearance between the right and left tires. Without the panhard bar the 305's might rub the inside of the wheel well. I agree, especially under hard acceleration or cornering as this would cause the alignment to go further out of whack as the rear suspension is further compressed. This would be a problem without the adj panhard bar. Link to comment Share on other sites More sharing options...
LuLu Posted January 25, 2008 Report Share Posted January 25, 2008 I'm not posting to argue with anyone, I simply want to inspire some additional thought. The Panhard rod is a stock factory item on all '05 and up Mustang GTs. I have two friends local to me that have stuffed 315 wide Nitto drag radials on the rear of their Mustang GTs without complications, however it is a tight fit. Neither of the cars sit lower than my SGT, so, I agree that there may be a problem with 315 wide. I believe the 305s with fit, but a 295/45 will deliver the same results. With regard to the mention of an adjustable Panhard rod as improving left to right movement, I suggest you look elsewhere first. Control arms, upper and lower. They are flexible and can "walk" on the bushings, shifting the axle position from left to right, and back again. The Panhard rod may be a thoughtful solution, but why not get to the root of the problem first? Get someting better...Fixed or adjustable, what ever you prefer, but a solid bar with improved bushings. Just get away from the stamped steel production line components before you spend money that doesn't solve the problem. Yes, you can add a improve Panhard rod, but if the axle is shifting, the rod is going to be working overtime and may cause other unforseen complications. Oh...BTW, if you decide to change any suspension components, be advised that the mounting hardware (bolts and flag nuts) are the usual "use once, thow away" torque to yield nuts and bolts. Get new ones from the parts counter? Link to comment Share on other sites More sharing options...
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