275's on OEM 19's?
#107
Originally Posted by patman530
Thanks for the pics. You have helped me make up my mind about what size to go when I replace mine. Do you have 245/35/19's in the fronts?
i'll post pics when i get them.
i actually like the little bit of a bulge. now i'm not going to be so worried about curbing my wheels any more.
#108
Registered User
iTrader: (10)
But why..............? Another "New" post!!
Sounds like my tard brother-in-law........285s on a 7" rim.....I told him it
wasn't a good idea..........the installer told him the same thing but he's
going to do what he wants! The 245s are good for the frontend but why
not just go with 255s out back.........no issues there.
wasn't a good idea..........the installer told him the same thing but he's
going to do what he wants! The 245s are good for the frontend but why
not just go with 255s out back.........no issues there.
#109
Originally Posted by gary c
Sounds like my tard brother-in-law........285s on a 7" rim.....I told him it
wasn't a good idea..........the installer told him the same thing but he's
going to do what he wants! The 245s are good for the frontend but why
not just go with 255s out back.........no issues there.
wasn't a good idea..........the installer told him the same thing but he's
going to do what he wants! The 245s are good for the frontend but why
not just go with 255s out back.........no issues there.
the 275/35 ratio produces a sidewall that is closer to stock then a 255/35 mix, meaning your speedo won't be as off.
check it out.
a 245/40/19 tire has the following characteristics.
Sidewall: 3.9"
Radius: 13.4"
Diameter: 26.7"
Circumference: 83.9"
Revs/mile: 755
the 275/35/19's that I put on have these characteristics;
Sidewall: 3.8"
Radius: 13.3"
Diameter: 26.6"
Circumference: 83.5"
Revs/mile: 759
as you can see it's a little smaller, and that means that my speedometer is going to be a tad fast (ie, when my speedo reads 60 I'll be going 59.7)
now, as for the 255/35/19 you suggested
Sidewall: 3.5"
Radius: 13"
Diameter: 26"
Circumference: 81.8"
Revs/mile: 775
this is much smaller then the stock tires, so now, when your speedo is reading 60, you're really only going 58.5.
To get all this data I used the tires size calculator on this website.
http://www.miata.net/garage/tirecalc.html
#112
#113
#114
#116
This thread is back from the dead.
I'm buying tires this week - Toyo T1R's.
Based on the info from http://www.miata.net/garage/tirecalc.html (thank you for posting this link, Madscientist!!!)....
255/35/19 Front and 275/35/19 Rear is closest to OEM in overall diameter, and thus the most accurate for the speedometer and odometer readings.
FRONT
225/40/19 OEM
Sidewall: 3.5 in
Radius: 13.0 in
Diameter: 26.1 in
Circumference: 82.0 in
Revolutions per mile: 773.0
255/34/19 comparison
Sidewall: 3.5 in (same as OEM)
Radius: 13.0 in (same as OEM)
Diameter: 26.0 in (-0.1 in)
Circumference: 81.8 in (-0.2 in)
Revolutions per mile: 775 (+ 2 rpm)
Speedometer reading with non-stock tire is 0.2% too fast. When your speedo reads 60mph, you are actually traveling 59.9mph
REAR
245/40/19 OEM
Sidewall: 3.9 in
Radius: 13.4 in
Diameter: 26.7 in
Circumference: 83.9 in
Revolutions per mile: 755.0
275/35/19 comparison
Sidewall: 3.8 in (-0.1 in)
Radius: 13.3 in (-0.1 in)
Diameter: 26.6 in (+0.1 in)
Circumference: 83.5 in (-0.4 in)
Revolutions per mile: 759.0 (+4 rpm)
Speedometer reading with non-stock tire is 0.5% too fast. When your speedo reads 60mph, you are actually traveling 59.7mph.
Based on this data, the choice is clear...bump up the 225/40/19's in the front to 255/35/19.
I'm very curious as to why no one on the forums has suggested this, if the calculations make it so evident that it's the correct way to go.
Are there any opinions on this setup? Has anyone tried it?
I'm buying tires this week - Toyo T1R's.
Based on the info from http://www.miata.net/garage/tirecalc.html (thank you for posting this link, Madscientist!!!)....
255/35/19 Front and 275/35/19 Rear is closest to OEM in overall diameter, and thus the most accurate for the speedometer and odometer readings.
FRONT
225/40/19 OEM
Sidewall: 3.5 in
Radius: 13.0 in
Diameter: 26.1 in
Circumference: 82.0 in
Revolutions per mile: 773.0
255/34/19 comparison
Sidewall: 3.5 in (same as OEM)
Radius: 13.0 in (same as OEM)
Diameter: 26.0 in (-0.1 in)
Circumference: 81.8 in (-0.2 in)
Revolutions per mile: 775 (+ 2 rpm)
Speedometer reading with non-stock tire is 0.2% too fast. When your speedo reads 60mph, you are actually traveling 59.9mph
REAR
245/40/19 OEM
Sidewall: 3.9 in
Radius: 13.4 in
Diameter: 26.7 in
Circumference: 83.9 in
Revolutions per mile: 755.0
275/35/19 comparison
Sidewall: 3.8 in (-0.1 in)
Radius: 13.3 in (-0.1 in)
Diameter: 26.6 in (+0.1 in)
Circumference: 83.5 in (-0.4 in)
Revolutions per mile: 759.0 (+4 rpm)
Speedometer reading with non-stock tire is 0.5% too fast. When your speedo reads 60mph, you are actually traveling 59.7mph.
Based on this data, the choice is clear...bump up the 225/40/19's in the front to 255/35/19.
I'm very curious as to why no one on the forums has suggested this, if the calculations make it so evident that it's the correct way to go.
Are there any opinions on this setup? Has anyone tried it?
Last edited by AthensBlueG; 03-28-2007 at 02:21 PM.
#117
Originally Posted by AthensBlueG
This thread is back from the dead.
I'm buying tires this week - Toyo T1R's.
Based on the info from http://www.miata.net/garage/tirecalc.html (thank you for posting this link, Madscientist!!!)....
255/35/19 Front and 275/35/19 Rear is closest to OEM in overall diameter, and thus the most accurate for the speedometer and odometer readings.
FRONT
225/40/19 OEM
Sidewall: 3.5 in
Radius: 13.0 in
Diameter: 26.1 in
Circumference: 82.0 in
Revolutions per mile: 773.0
255/34/19 comparison
Sidewall: 3.5 in (same as OEM)
Radius: 13.0 in (same as OEM)
Diameter: 26.0 in (-0.1 in)
Circumference: 81.8 in (-0.2 in)
Revolutions per mile: 775 (+ 2 rpm)
REAR
245/40/19 OEM
Sidewall: 3.9 in
Radius: 13.4 in
Diameter: 26.7 in
Circumference: 83.9 in
Revolutions per mile: 755.0
275/35/19 comparison
Sidewall: 3.8 in (-0.1 in)
Radius: 13.3 in (-0.1 in)
Diameter: 26.6 in (+0.1 in)
Circumference: 83.5 in (-0.4 in)
Revolutions per mile: 759.0 (+4 rpm)
Based on this data, the choice is clear...bump up the 225/40/19's in the front to 255/35/19.
I'm very curious as to why no one on the forums has suggested this, if the calculations make it so evident that it's the correct way to go.
Are there any opinions on this setup? Has anyone tried it?
I'm buying tires this week - Toyo T1R's.
Based on the info from http://www.miata.net/garage/tirecalc.html (thank you for posting this link, Madscientist!!!)....
255/35/19 Front and 275/35/19 Rear is closest to OEM in overall diameter, and thus the most accurate for the speedometer and odometer readings.
FRONT
225/40/19 OEM
Sidewall: 3.5 in
Radius: 13.0 in
Diameter: 26.1 in
Circumference: 82.0 in
Revolutions per mile: 773.0
255/34/19 comparison
Sidewall: 3.5 in (same as OEM)
Radius: 13.0 in (same as OEM)
Diameter: 26.0 in (-0.1 in)
Circumference: 81.8 in (-0.2 in)
Revolutions per mile: 775 (+ 2 rpm)
REAR
245/40/19 OEM
Sidewall: 3.9 in
Radius: 13.4 in
Diameter: 26.7 in
Circumference: 83.9 in
Revolutions per mile: 755.0
275/35/19 comparison
Sidewall: 3.8 in (-0.1 in)
Radius: 13.3 in (-0.1 in)
Diameter: 26.6 in (+0.1 in)
Circumference: 83.5 in (-0.4 in)
Revolutions per mile: 759.0 (+4 rpm)
Based on this data, the choice is clear...bump up the 225/40/19's in the front to 255/35/19.
I'm very curious as to why no one on the forums has suggested this, if the calculations make it so evident that it's the correct way to go.
Are there any opinions on this setup? Has anyone tried it?
#119
Originally Posted by AthensBlueG
Whatever I do, I need to keep a 20mm stagger between front and back? 225 Front, 245 Rear being similar to 245 Front, 265 Rear?