255 Rear / 245 Fronts Experience
#1
255 Rear / 245 Fronts Experience
Hey guys, I have a question for everyone who has tried this set up, specifically the rears! I talked to a guy at Tirerack.com who left a bad taste in my mouth about this setup. I wanted to go with a 255/45/18 rear all seasons with 245/40/18 fronts. I know this topic has already been mentioned in this forum but I've seen very little actual content about how this setup performs and feels. The guy at tirerack.com said I would basically neuter the car because the rear tires would roll under the rim while cornering. I'm not looking for super performance here, but I don't want the rear to feel like its floating or squishy. I was a little surprised that he would say that considering it is only a little wider than stock. Could someone who actually has this setup please comment on their experience!
Thanks!
Jeff
Thanks!
Jeff
#2
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Re: 255 Rear / 245 Fronts Experience
That seems kind of weird. 255's in the rear are only 10mm wider than stock so the stock rears should take it fine. As for the front rims, 245's on stock rims seems a bit wide. But this is one of those deals that either work or don't work. If it doesn't work, it can't be done.
The TireRack people seem to give a lot of people really weird advice lately.
____________________________________
My Ride: 03 G35 Coupe 6MT Black/Black
My Mods: 15% tint and nothing else!
My Mileage: 13,300 (as of 11/03/04)
The TireRack people seem to give a lot of people really weird advice lately.
____________________________________
My Ride: 03 G35 Coupe 6MT Black/Black
My Mods: 15% tint and nothing else!
My Mileage: 13,300 (as of 11/03/04)
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Re: 255 Rear / 245 Fronts Experience
The 245/40 - 255/45/18 combo should work quite well. The car will handle in a more neutral fashion (not so much understeer), and the factory stagger will remain. Since both the fronts and rears are 8" wide, the tires will fit quite nicely. There should be no issue.
Lou
Lou
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Re: 255 Rear / 245 Fronts Experience
Agree with Lou. I don't have direct experience with that set-up but I know someone who does in some pilot a/s sports. He's hasn't had any problems.
255 is ideally matched up with a 9" wheel but it'll do on an 8" It didn't look like it bulged at all either.
255 is ideally matched up with a 9" wheel but it'll do on an 8" It didn't look like it bulged at all either.
#6
#7
Re: 255 Rear / 245 Fronts Experience
I have had this set up for 3 months on stock rims. Pilot Sport A/S. I really like it. I didn't ever drive hard enough to slide the front tires before buy I have plenty of confidence that the car will handle nuetral now. I'm not autocrossing or anything, but it feels just fine to me. The only negative is that the steering seems to be not as crisp, or have less feed back, but I after a week I didn't notice it anymore. When I run these tires down I'm going to get another set just like them.
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#8
Re: 255 Rear / 245 Fronts Experience
I ran this setup as well and it worked GREAT! 245/40 front and 255/45 rears on stock 18's! It all but eliminates the understeer (which was VERY welcome) and adds a beefier look to the car in general. It helps fill the wheel well in the rear, but I would swear you could not tell a difference in the front from the side, but obviously it is wider! I would NEVER go back to 225/245 ever if I still had stock 18's. Here is a pic on black stock 18's
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
383802-IMG_0072.jpg
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
383802-IMG_0072.jpg
#9
#10
Re: 255 Rear / 245 Fronts Experience
I did A LOT of research before switching......I cannot come up with one negative issue, I would have not done it if that was the case! Your speedo will be off a touch, here are the details FYI:
Your speedo will be 1.3% too slow runnning 255/45/18's as opposed to 245/45/18. When your speedo reads 60pmh, you will actually be travelling 60.8mph
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
Your speedo will be 1.3% too slow runnning 255/45/18's as opposed to 245/45/18. When your speedo reads 60pmh, you will actually be travelling 60.8mph
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
#11
Re: 255 Rear / 245 Fronts Experience
Roadracer: How do you come up with the 1.3% ?
255/45/18 makes 771 revs per miles
245/45/18 makes 680 revs per miles
Therefore, according to the spec posted on Tirerack, there is a 91 revs difference. 91/680 x 100 = 13%.
If that is correct, then when the speedo reads 60, he would be going 68mph. Correct?
255/45/18 makes 771 revs per miles
245/45/18 makes 680 revs per miles
Therefore, according to the spec posted on Tirerack, there is a 91 revs difference. 91/680 x 100 = 13%.
If that is correct, then when the speedo reads 60, he would be going 68mph. Correct?
#13
Re: 255 Rear / 245 Fronts Experience
The 255 will turn fewer times than the 245 because it is larger in diameter, all be it minor! It is true that different brands has minor differences in dimensions within the same size. That calculation came from this website ( http://www.miata.net/garage/tirecalc.html )and gives you a general rule of what to expect. This difference is SOOO little, it will not mess with the VDC, which is VERY important!
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
'03.5 G Coupe, 6 speed, Bose, Nav, Ivory Pearl / Graphite, Bat's inlays, Short ram intake, Axis Millano 19's staggered, Tien H-Tech springs!
#15