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      01-05-2009, 01:47 AM   #1
MrHarris
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Going to 275's in the rear

Would I need 275/35/19 or 275/30/19 for it to look right and for the speedo to be closest to accurate as possible
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      01-05-2009, 01:55 AM   #2
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I think you will find the 275/35-19 to be best for speedometer accuracy. The car reads high already. The very slight increase in diameter will only reduce how much the speedo reads high. Check the TireRack site for information on the difference in diameters.

I think the speedo reads somewhere between 3 and 5 percent high. If the new tire is less than 3 percent larger in diameter than stock, your speedo accuracy will actually improve.
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      01-05-2009, 02:13 AM   #3
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why don't u go with 295 30 19 ?
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      01-05-2009, 02:14 AM   #4
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I was thinking that the speedo read high also because we have some stationary speed zones by our school here where your speed flashes followed by 'SLOW DOWN'... where did you come accross this information on the 3-5% error?
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      01-05-2009, 05:29 AM   #5
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Would 275/30/19 look funny? I saw a pic once and everyone was saying how small they looked or something. Also how would 255/35/19 be in the front? Would that make things look weird?
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Last edited by MrHarris; 01-05-2009 at 06:29 AM.
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      01-05-2009, 06:38 AM   #6
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Quote:
Originally Posted by davedave View Post
why don't u go with 295 30 19 ?
would 295 fit on stock 9.5 rims?
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      01-05-2009, 08:46 AM   #7
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Quote:
Originally Posted by MrHarris View Post
Would 275/30/19 look funny? I saw a pic once and everyone was saying how small they looked or something. Also how would 255/35/19 be in the front? Would that make things look weird?
I had posted pics of 275/30/19's in the rear and they look too small

Last edited by sgmsmg; 11-20-2009 at 01:04 AM.
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      01-05-2009, 10:25 AM   #8
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Go 285 or 295 /30. They should fit on stock wheels
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      01-05-2009, 01:43 PM   #9
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This should help.

http://www.miata.net/garage/tirecalc.html
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      02-09-2009, 01:47 AM   #10
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Quote:
Originally Posted by boostedtwin View Post
Go 285 or 295 /30. They should fit on stock wheels
Would going 295/30/19 on stock rims cause any problems ?
I'm about to switch out tires and wanted to go to a wider tire.
How about the fronts ? Would I have to go bigger if I change the size of the rears ?
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      02-09-2009, 01:52 AM   #11
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Quote:
Originally Posted by rav7ks View Post
Would going 295/30/19 on stock rims cause any problems ?
I'm about to switch out tires and wanted to go to a wider tire.
How about the fronts ? Would I have to go bigger if I change the size of the rears ?
Yes, too wide for the stock rims.

You don't have to go bigger in front, but you should depending on how wide you go.
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      02-09-2009, 07:26 AM   #12
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Quote:
Originally Posted by MrHarris View Post
would 295 fit on stock 9.5 rims?
According to Tire Rack, 10" is the minimum wheel width for 295...
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      02-09-2009, 10:29 AM   #13
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Quote:
Originally Posted by Sticky View Post
Yes, too wide for the stock rims.

You don't have to go bigger in front, but you should depending on how wide you go.
I thought so.
So would I be able to fit 285/30/19 on stock 19" ?
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      02-09-2009, 10:32 AM   #14
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Quote:
Originally Posted by rav7ks View Post
I thought so.
So would I be able to fit 285/30/19 on stock 19" ?
You can find the answer to your own question at www.tirerack.com...
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      02-09-2009, 11:57 AM   #15
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Quote:
Originally Posted by Radiation Joe View Post
I think the speedo reads somewhere between 3 and 5 percent high. If the new tire is less than 3 percent larger in diameter than stock, your speedo accuracy will actually improve.
Well, almost--it's circumference you need to compare, not diameter. A 35 larger diameter will give you a 9+% larger circumference, which translates to 9% fewer revs/mile.
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      02-09-2009, 12:06 PM   #16
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Quote:
Originally Posted by GregW / Oregon View Post
Well, almost--it's circumference you need to compare, not diameter. A 35 larger diameter will give you a 9+% larger circumference, which translates to 9% fewer revs/mile.
Oops!
Thanks Greg.

Wait a second!

Circ = pi*D

Therefore 3% increase in D = 3% increase in circumference.

Gotcha.
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      02-09-2009, 12:28 PM   #17
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Quote:
Originally Posted by Radiation Joe View Post
Oops!
Thanks Greg.

Wait a second!

Circ = pi*D

Therefore 3% increase in D = 3% increase in circumference.

Gotcha.
You're right--brain not fully engaged before 8:00 in the moring!
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      02-09-2009, 01:27 PM   #18
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      02-09-2009, 01:35 PM   #19
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Use this tire calculator...I think it tells you how much if will affect your speed.

http://www.1010tires.com/tiresizecalculator.asp
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      02-09-2009, 03:29 PM   #20
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Finally, I have the same question.

Will 285/35/19 fit in stock 9,5" rims?
I couldnt find an answer at Tirerack.com
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      02-09-2009, 05:58 PM   #21
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Quote:
Originally Posted by artur777! View Post
Finally, I have the same question.

Will 285/35/19 fit in stock 9,5" rims?
I couldnt find an answer at Tirerack.com
Try harder.
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      02-10-2009, 07:26 PM   #22
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Quote:
Originally Posted by Sticky View Post
Try harder.
Are u kidding?
If you know - advise when to look or just say - thx in advance for this
If you don't know - then your comment is not funny:-)
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