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Post by chewbaccadefense on Jul 1, 2013 6:25:04 GMT -5
I currently have 16 x 7.5 wheels with 205 45 16's. I want to run 225 45 16's on them, and have been told the tires might be too big for a 7.5 rim. Does anyone have experience with this size difference? I know the tires will fit on the wheels, but what is the drawback if they are a bit too big? I want to run the Direzza Zii's or possibly the BFG Rivals in 225 50 16. I think the Zii's are the best option because with as little power as I have, increasing the circumference with the Rivals will just slow down acceleration more. The Zii's are almost the same circumference as stock.
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Post by lilgunny on Jul 1, 2013 7:19:05 GMT -5
I had 225's on my 03 Protege' and they rubbed pretty bad...might want to check on that first...jus sayin.
LilGunny
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Post by CoolGuy094 on Jul 1, 2013 7:20:31 GMT -5
It is very common for S2000's to run 225/40/17 on their OEM 17x7.5 front wheels as daily-driver tires and as performance/race tires. I know that's a 17 vs your 16, but the widths are the same and you have a bit more height on the sidewall than they do. A 225 width tire is only a bit over 1" wider than the 7.5" rim width, and therefore won't be squeezed too much. I feel it will work just fine.
Also consider this... I (and tons of other S2000's) run 255's on 8.5" wide rims regularly with no issues, in which the tire is over 1.5" wider than the rim width. AND crazy people in nationals level BS S2000's run 275 Hoosiers front and rear, which means they're running 275's on a 7.5" wide rim, which is nearly a 3.5" width difference between tire and rim, lol.
The only issue I could see you running into would be rubbing issues on your fender/liner if you are lowered or have really soft springs. To see if this may be an issue, I would recommend researching on some forums specific to your car to see if others had any issue when running 225's.
Edit - Gunny beat me to it... re: last paragraph in my post, sounds like you need to do that research and see if others have rubbed with 225's.
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Post by chewbaccadefense on Jul 1, 2013 11:55:26 GMT -5
It is very common for S2000's to run 225/40/17 on their OEM 17x7.5 front wheels as daily-driver tires and as performance/race tires. I know that's a 17 vs your 16, but the widths are the same and you have a bit more height on the sidewall than they do. A 225 width tire is only a bit over 1" wider than the 7.5" rim width, and therefore won't be squeezed too much. I feel it will work just fine. Also consider this... I (and tons of other S2000's) run 255's on 8.5" wide rims regularly with no issues, in which the tire is over 1.5" wider than the rim width. AND crazy people in nationals level BS S2000's run 275 Hoosiers front and rear, which means they're running 275's on a 7.5" wide rim, which is nearly a 3.5" width difference between tire and rim, lol. The only issue I could see you running into would be rubbing issues on your fender/liner if you are lowered or have really soft springs. To see if this may be an issue, I would recommend researching on some forums specific to your car to see if others had any issue when running 225's. Edit - Gunny beat me to it... re: last paragraph in my post, sounds like you need to do that research and see if others have rubbed with 225's. Thanks Gunny and coolguy! I know I am going to have to run spacers, and ST allows me to remove the finder liners. I have racing beat springs (dropped the car a minimal amount from stock), but it's much stiffer, but I will check to see if I can find a thread on the Mazda forums. |
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Post by czrider on Jul 1, 2013 12:01:41 GMT -5
Tire engineers will tell you that a tire that is within 15 % +/- the rim width
will function as intended by the designer.
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Post by dasautochris on Jul 1, 2013 13:31:17 GMT -5
Federals not working out for you, Trey?
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Post by chewbaccadefense on Jul 1, 2013 13:53:09 GMT -5
Federals not working out for you, Trey? No, they're working great. I won novice this weekend...but going that fast made me want to go faster and that extra 20 will help with that. In fact, if Federal made the RS-R in 225-16, I'd buy them as price wise they can't be beat. Not to mention that once I started running 41 lbs in the front and 45 lbs in the rear, the sidewalls quit giving, and the thing corners amazingly. How are you liking yours? |
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Post by chewbaccadefense on Jul 1, 2013 13:55:28 GMT -5
Tire engineers will tell you that a tire that is within 15 % +/- the rim width will function as intended by the designer. Good to know. I was worried they would flex more because of it, but if people at nationals are running really wide tires on narrow rims, I feel pretty sure they'd be okay for someone like me. |
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Post by yellow CR on Jul 1, 2013 14:01:13 GMT -5
The size is fine, as long as they fit under the wheel well and don't rub. Just check your clearences now with the 205's and see if you may have any spots where they may rub (like fenders, control arms and struts).
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Post by dasautochris on Jul 1, 2013 15:58:50 GMT -5
Federals not working out for you, Trey? No, they're working great. I won novice this weekend...but going that fast made me want to go faster and that extra 20 will help with that. In fact, if Federal made the RS-R in 225-16, I'd buy them as price wise they can't be beat. Not to mention that once I started running 41 lbs in the front and 45 lbs in the rear, the sidewalls quit giving, and the thing corners amazingly. How are you liking yours? I'm loving them. They were good enough to get me 9th out of 18 in intermediate class, and there is some really tough competition in that class. If I were running open STX or open DSP I would have took the gold. For the price I don't think you can beat them. Too bad they don't have anymore 16" sizes. Next time I get some I'm going to step up to 255 instead of 235. |
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Post by clemsonmz3 on Jul 2, 2013 9:52:11 GMT -5
I won novice this weekend...but going that fast made me want to go faster and that extra 20 will help with that. So you're the STF Protege...I hate to be the one to inform you that you're car is not eligible for STF. It is an STC car...sorry! You will have to run a good bit faster to win Novice again. The good news is that STF and STC have identical mod allowances, including wheels and tires. I've run 225/45/17 Star Specs on a 17x7 for a couple years and it does great. If your running a 7.5" width you'll be fine with a 225 tire...that's what I run now (225/40/18 on 18x7.5). Like mentioned above you'll just have to be concerned with rubbing. You are allowed to run spacers in ST. I think you should try the ZIIs since they are a 45 ratio and the same diameter as stock. IMO, with you being a novice, you will like the Dunlop's forgiveness better than the Rivals. |
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Post by chewbaccadefense on Jul 2, 2013 17:06:23 GMT -5
I won novice this weekend...but going that fast made me want to go faster and that extra 20 will help with that. So you're the STF Protege...I hate to be the one to inform you that you're car is not eligible for STF. It is an STC car...sorry! You will have to run a good bit faster to win Novice again. The good news is that STF and STC have identical mod allowances, including wheels and tires. I've run 225/45/17 Star Specs on a 17x7 for a couple years and it does great. If your running a 7.5" width you'll be fine with a 225 tire...that's what I run now (225/40/18 on 18x7.5). Like mentioned above you'll just have to be concerned with rubbing. You are allowed to run spacers in ST. I think you should try the ZIIs since they are a 45 ratio and the same diameter as stock. IMO, with you being a novice, you will like the Dunlop's forgiveness better than the Rivals. Crap. I apologize to everyone for classing my car wrong. I thought I saw Protege's in STF, but I just went back and looked and you are correct. Who do I inform to get my results changed? |
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Post by PinkBimmer on Jul 2, 2013 17:56:15 GMT -5
So you're the STF Protege...I hate to be the one to inform you that you're car is not eligible for STF. It is an STC car...sorry! You will have to run a good bit faster to win Novice again. The good news is that STF and STC have identical mod allowances, including wheels and tires. I've run 225/45/17 Star Specs on a 17x7 for a couple years and it does great. If your running a 7.5" width you'll be fine with a 225 tire...that's what I run now (225/40/18 on 18x7.5). Like mentioned above you'll just have to be concerned with rubbing. You are allowed to run spacers in ST. I think you should try the ZIIs since they are a 45 ratio and the same diameter as stock. IMO, with you being a novice, you will like the Dunlop's forgiveness better than the Rivals. Crap. I apologize to everyone for classing my car wrong. I thought I saw Protege's in STF, but I just went back and looked and you are correct. Who do I inform to get my results changed? I'll handle it... |
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Post by chewbaccadefense on Jul 2, 2013 19:52:39 GMT -5
Really bummed out. I have no shot as my PAX multiplier is only .002 less than STX...and I have maybe 105hp at the wheels if I'm lucky. Oh well, autocross is a freaking blast, so I guess I'll just enjoy the ride. Good news is, no reason to get new tires now as I don't think I'm going to pick up that much time. I'll work on the driver for the rest of the year and hope my plan to get a dedicated autocross car next year. I just saved $600!
I don't understand how SCCA thinks a car like mine is almost the same in PAX as a Mazdaspeed 3 or even a Gen III and IV GTI?
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Post by belcher on Jul 3, 2013 5:38:59 GMT -5
Sorry to hear about that classification error. I think working on driver skills will help the most. I wouldn't give up on tires if wish to keep running the Protege. It's not all about horsepower in this game. That just a Cooper went low 72 sec. which was a lot faster than me and my AWD 250hp VW. And I thought I was going like the wind.
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Post by dasautochris on Jul 3, 2013 6:02:54 GMT -5
Yeah, don't get too discouraged. Horsepower isn't high priority on the list of importance for this sport. Driver > tires > suspension > power. Check out Frodo with his Mazda3 2.slow. I have 75% more horsepower and torque than he does, and I was only 0.165secs faster than him. He has ZII's but I'm not sure how much better they are than my Federals. I need to let someone else drive my car that has experience with different tires to let me know how they stack up against the the other top ax tires.
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Post by clemsonmz3 on Jul 3, 2013 7:32:12 GMT -5
Really bummed out. I have no shot as my PAX multiplier is only .002 less than STX...and I have maybe 105hp at the wheels if I'm lucky. Oh well, autocross is a freaking blast, so I guess I'll just enjoy the ride. Good news is, no reason to get new tires now as I don't think I'm going to pick up that much time. I'll work on the driver for the rest of the year and hope my plan to get a dedicated autocross car next year. I just saved $600! I don't understand how SCCA thinks a car like mine is almost the same in PAX as a Mazdaspeed 3 or even a Gen III and IV GTI? Sorry for getting you down. The STC pax is set by the 198* civic hatch..."God's Chariot". They also have around 100-110hp, but they are lightening fast. I rarely get inside of 2 sec off the pace of those things in my Mazda3. The civics are all about lightness and agility not power. The Protege has those same characteristics. Don't get discouraged, I out run many Speed3s in raw time in my STF Mazda3. <--That's fun to do! So don't focus on PAX, run for raw time (and fun). Then brag about how you out ran a 250hp awd R32. |
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Post by PinkBimmer on Jul 3, 2013 7:34:10 GMT -5
Ok I have reclassed. Updated results are in the event thread.
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Post by belcher on Jul 3, 2013 8:28:10 GMT -5
[quote Then brag about how you out ran a 250hp awd R32.[/quote]
Yea but I sound fast.
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