widest tire on 7.5inch rim
03-05-04 | 01:19 PM
#5
Full Member
Joined: Jan 2004
Posts: 182
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From: Tempe, AZ
riiiiiiiiihgt
Originally posted by 88IntegraLS
I'm guessing 245 width is the maximum you could stretch over a 7.5" rim. I would recommend 225 to keep the tire sidewalls as perpendicular to the road as possible.
I'm guessing 245 width is the maximum you could stretch over a 7.5" rim. I would recommend 225 to keep the tire sidewalls as perpendicular to the road as possible.
the absolute widest i would go on a 7.5 with a 40 aspect ratio would be a 225. Anything bigger would suck for handling response and tire wear.
My rule of thumb for correct tire-wheel fitments. If the guy putting it on has to use two tire bars and/or has to work really hard to get it on there, the tire is too wide for the wheel.
someone needs to sticky a Rule Of Thumb or something so these people stop asking if they can put Vette tires on 17x7s.
divide the section width by 25.4 to get inches.
225/25.4=8.6inches. this is already over an inch wider than the rim. Anything over an inch wider than the rim will negatively affect turn in/response, etc. when compared to a narrower tire on the same wheel.
I try to stay under an inch when I put performance tires on my cars. if a mod wants me to write up a more coherent General rules of Tire/wheel ratios i can.
03-07-04 | 12:20 AM
#6
Mad Man
Joined: Jan 2002
Posts: 2,758
Likes: 2
From: Big Island Hawaii
More coherent is definitely something you ought to consider 
Do you own thwe wheels already?
A 245-45 is fine, a 245-40-17 is also OK, but a 245-40-18 is pushing it. As an Example, I run a 255-40-17 V700 R compound on an 8" rim, sugeested is 8.5-10, but I have perfect temps, and wear with the 8" rim. Alot depends on the rest of your set-up. That said, the 7.5 is really narrow for an FD, that's 1/2" narrower than stock. If You have 7.5s, and love the wheel, you could have them widened, for 250.00-350.00 per wheel. Carl
What's this "powah" thing anyway...
Do you own thwe wheels already?A 245-45 is fine, a 245-40-17 is also OK, but a 245-40-18 is pushing it. As an Example, I run a 255-40-17 V700 R compound on an 8" rim, sugeested is 8.5-10, but I have perfect temps, and wear with the 8" rim. Alot depends on the rest of your set-up. That said, the 7.5 is really narrow for an FD, that's 1/2" narrower than stock. If You have 7.5s, and love the wheel, you could have them widened, for 250.00-350.00 per wheel. Carl
What's this "powah" thing anyway...
03-07-04 | 04:50 PM
#7
Full Member
Joined: Jan 2004
Posts: 182
Likes: 0
From: Tempe, AZ
powah
Originally posted by Carl Byck
More coherent is definitely something you ought to consider Do you own thwe wheels already?
A 245-45 is fine, a 245-40-17 is also OK, but a 245-40-18 is pushing it. As an Example, I run a 255-40-17 V700 R compound on an 8" rim, sugeested is 8.5-10, but I have perfect temps, and wear with the 8" rim. Alot depends on the rest of your set-up. That said, the 7.5 is really narrow for an FD, that's 1/2" narrower than stock. If You have 7.5s, and love the wheel, you could have them widened, for 250.00-350.00 per wheel. Carl
What's this "powah" thing anyway...
More coherent is definitely something you ought to consider
Do you own thwe wheels already?A 245-45 is fine, a 245-40-17 is also OK, but a 245-40-18 is pushing it. As an Example, I run a 255-40-17 V700 R compound on an 8" rim, sugeested is 8.5-10, but I have perfect temps, and wear with the 8" rim. Alot depends on the rest of your set-up. That said, the 7.5 is really narrow for an FD, that's 1/2" narrower than stock. If You have 7.5s, and love the wheel, you could have them widened, for 250.00-350.00 per wheel. Carl
What's this "powah" thing anyway...
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03-07-04 | 08:53 PM
#8
Thread Starter
Banned. I got OWNED!!!
Joined: Jun 2003
Posts: 1,619
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From: Central Florida
Well I already paid for em ect.. They are Racing Hart c5's He has 235x40x18 on 2 and the other 2 have no tires.. So Iam trying to figure out what sizes to put on the other 2....
Matt
Matt
03-09-04 | 01:43 AM
#11
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Joined: Sep 2003
Posts: 146
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From: va
225/25.4=8.6inches. this is already over an inch wider than the rim. Anything over an inch wider than the rim will negatively affect turn in/response, etc. when compared to a narrower tire on the same wheel
it is very possable to have a 215 wider than a 225, 235, and even as much as a 245 in extreme cases as far as tread width is concerned. Lets take a 225/50/16 for example. 225= the sectional width in mm, not tread width. 50= percentage of sectional with, or 225 x .50. and 16 is, well, you know what it is. Sectional width is the width of the tire from sidewall to sidewall at its widest point on a given rim. A friend a yokahama told me that there is NO standard for what rim size is used when calculating sectional width. Most manufacturers spec a 195-225 tire on a 6" wide rim, but that also changes with performance type. In other words if a 225 tire that was spec'd on a 6" rim was put on a 7" rim would yeild a sectional width of 235 and 245 on an 8" rim (10mm per inch) . But the tread width would not change. So in other words a 215 tire spec'd on a 6" rim and a 225 spec'd on a 7" rim could indeed have the same tread width, and pretty much in essence be the exact same tire size. Sidewall thickness is also an important point, as a thicker sidewall would not bulge as much, and in turn, make the tread width wider. Like a 225-40-16 bridgestone SO2 pole posistion would have a greater tread width than a 225-70-16 bridgestone turanza. So hey, maybe treadwidth can increase as the aspect ratio decreases, since the sidewall is stiffer on lower series tires.
-E
