Widest Tires for NB?
#1
Widest Tires for NB?
I will need to get new shoes pretty soon, and would like to know what are the widest tires (front and rear) I can use on my standard 17 cup wheels, I think they are 8in F and 9in R. Also, I have a C4 so I know my rears need to turn a little faster than my fronts...thoughts?
Last edited by FLYT993; 10-21-2007 at 12:04 AM.
#6
It's all about front to rear rolling radius delta:
Your question, "what are the widest tires (front and rear) I can use on my standard 17 cup wheels, I think they are 8in F and 9in R."
If you have 8" front wheels, very rare wheels indeed, you can easily run a 235/45/17 tire paired up with a 275/40/17 tire. Don Plumley does this, I do this as do lots of folks. A great tire combination....available from Toyo in their RA-1 DOT race tire.
Why not a 235/40 tire with the 275/40/17 tire? Or if there were such a beast, a a 235/45/17 front with a 275/35/17 rear tire? It all comes down to your ABS computer that does not want to see a tire rolling radius delta, front to rear of greater than I believe 3%. Those with a manual can confirm this.
When you violate the rolling radius rule, your ABS will shut down...not a pleasant thing. I have a rolling radius EXCEL spread sheet I'll send you. PM me with your e-mail address if you want the spread sheet. On the sheet you simply plug in the tire width (235), the aspect in % (45), the wheel size (17") for fronts and rears and the rolling radius delta is calculated for you.
I mistakenly bought a pair of 234/40/17 front tires, whoops, I had to sell them to Bimmer racer.
If you have 8" front wheels, very rare wheels indeed, you can easily run a 235/45/17 tire paired up with a 275/40/17 tire. Don Plumley does this, I do this as do lots of folks. A great tire combination....available from Toyo in their RA-1 DOT race tire.
Why not a 235/40 tire with the 275/40/17 tire? Or if there were such a beast, a a 235/45/17 front with a 275/35/17 rear tire? It all comes down to your ABS computer that does not want to see a tire rolling radius delta, front to rear of greater than I believe 3%. Those with a manual can confirm this.
When you violate the rolling radius rule, your ABS will shut down...not a pleasant thing. I have a rolling radius EXCEL spread sheet I'll send you. PM me with your e-mail address if you want the spread sheet. On the sheet you simply plug in the tire width (235), the aspect in % (45), the wheel size (17") for fronts and rears and the rolling radius delta is calculated for you.
I mistakenly bought a pair of 234/40/17 front tires, whoops, I had to sell them to Bimmer racer.
#7
In addition to Martin's spreadsheet, here's an online calculator: http://www.1010tires.com/TireSizeCalculator.asp
http://www.miata.net/garage/tirecalc.html
Put in your front and rear and it will tell you the differences.
Edited for one that works...thanks Martin!
http://www.miata.net/garage/tirecalc.html
Put in your front and rear and it will tell you the differences.
Edited for one that works...thanks Martin!
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#8
Link no worky....
Here is what I got....
Not Found
The requested URL /garage/tirecalc.htm was not found on this server.
Apache/2.0.52 (Red Hat) Server at www.miata.net Port 80
Not Found
The requested URL /garage/tirecalc.htm was not found on this server.
Apache/2.0.52 (Red Hat) Server at www.miata.net Port 80
#9
#11
That means that the following "nearest to OEM" sizing for Michelin PS's is 3.3% out of size for the 17" wheels: 205/55ZR17 and 255/40ZR17
When I plug in the 205/50/17 along with the 255/40/17 to the calculator, I get a difference around .25%
Are people driving around with the 55 series front thereby disabling their ABS? If so, does this matter?
So much to learn, so little time....
When I plug in the 205/50/17 along with the 255/40/17 to the calculator, I get a difference around .25%
Are people driving around with the 55 series front thereby disabling their ABS? If so, does this matter?
So much to learn, so little time....
#12
Hi Dan,
As Don, Martin, et al have said, I think 275's are the biggest that most people here talk about using with a 9" wide, 17" rim. Maybe others have used a 285, but that's the tire size that I run with my 10" wide 18" Fikses. I have also run a 295 tire on the same rim, though.
As Don, Martin, et al have said, I think 275's are the biggest that most people here talk about using with a 9" wide, 17" rim. Maybe others have used a 285, but that's the tire size that I run with my 10" wide 18" Fikses. I have also run a 295 tire on the same rim, though.
#13
One last point...really, the last one! (On this subject at least!)
Just to finalize re the above, "I think 275's are the biggest that most people here talk about using with a 9" wide, 17" rim."
275 is the largest size most tire mfg recommend be mounted on a 9" wheel. Also, it will be tough to find anything much wider for 17"...at least I have not seen it...but always ready to be wrong!
225 is the widest most tire mfg recommend be mounted on a 7" wheel, but I run 235 RA-1s, what is a mere 10mm. I have seen the Kumho 710 in a 245 mounted on a 7" wheel and the sidewall appeared vertical...so it appears that tire sizes, although labeled the same, may vary from mfg. to mfg.
275 is the largest size most tire mfg recommend be mounted on a 9" wheel. Also, it will be tough to find anything much wider for 17"...at least I have not seen it...but always ready to be wrong!
225 is the widest most tire mfg recommend be mounted on a 7" wheel, but I run 235 RA-1s, what is a mere 10mm. I have seen the Kumho 710 in a 245 mounted on a 7" wheel and the sidewall appeared vertical...so it appears that tire sizes, although labeled the same, may vary from mfg. to mfg.