Rotation
Thread Starter
Safety Car
Joined: Aug 2006
Posts: 4,147
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From: Port St. Lucie West Florida
Rotation
I have a 95 vert. with stock (saw) wheels.I believe the size rims are 17 x 8.5 front and 17 x 9.5 rear.the tire size is 275 all around.Can I rotate the tires even if the rims are a different size ?
Thank You
Thank You
Thread Starter
Safety Car
Joined: Aug 2006
Posts: 4,147
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From: Port St. Lucie West Florida
What tire size came standard with the car?Are the rim size the correct dimensions that I previously mentioned ? This is the way I purchased the car from original owner .
Thanks
Thanks
Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
You can rotate, but the correct size for the front tire (for an 8.5" rim) is 255-45.
If you rotate with the present set-up (put 8.5" rims on the rear), the handling may feel a little odd, and the offset will be wrong...but you can do it.
I wouldn't.
What I would do is verify the width of your front rims...then get back to us.
Larry
code5coupe
If you rotate with the present set-up (put 8.5" rims on the rear), the handling may feel a little odd, and the offset will be wrong...but you can do it.
I wouldn't.
What I would do is verify the width of your front rims...then get back to us.
Larry
code5coupe
Last edited by rocco16; Nov 14, 2006 at 12:13 PM.
Le Mans Master
Joined: Jan 2006
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From: Woodstock Georgia
And the rear tires on 9.5 rims from the factory are 285/40. The 275s fit fine on the 9.5 rims, but really should not be on an 8.5 rim. At the very least I would measure the rims to see what you have (I am guessing previous owner put 9.5 rims all the way around?). If they are really 8.5 and 9.5s I certainly would not rotate them.
Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by enventr
Thanks guys-I guess I will have to measure the front rims.
Good luck!
Larry
code5coupe
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Well, wait a minute. The Z51 option uses 275-40-17 tires at all four corners, right? Granted, the rims should be 9.5" all around as well. But that means the rears on a Z51 are 275-40 on 9.5" rims.
Matter of fact, Luke (fr. tirerack) has suggested to me that the tire width is negligible from 285-40 to 275-40, and will provide the opportunity to rotate, at least front to back, with my four, 9.5" wheels.
Am I wrong? Please correct me if so.
Matter of fact, Luke (fr. tirerack) has suggested to me that the tire width is negligible from 285-40 to 275-40, and will provide the opportunity to rotate, at least front to back, with my four, 9.5" wheels.
Am I wrong? Please correct me if so.
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From: Lacey WA RVN 68-69
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In many cases the difference in width of a 275 and 285 tires is not a lot, probably a half-inch or so. But there is a difference in the diameter and that can be a good 10-12 revs per mile. That may show up in the odomerter reading over a period of time but may not show up as as speedo error.
Also, some brands may have a much narrower tread width for a given size compared to others. The early Firestone SZ50 tires had close to a full inch less tread width compared to a BFG or Goodyear tire of the same size.
The Tire Rack has specification pagess for their tires by brand and type. One spec is the rim width range for a given size of tire. In most cases, the 285/40 tire shows a recommended rim size of 9.5 to 11" and the 275 tire shows a 9"-11" wheel width. IMHO, the high end of 11" is a bit too wide for either of these sizes.
The factory wheels should have the wheel width and diameter cast into the inside of the center.
Also, some brands may have a much narrower tread width for a given size compared to others. The early Firestone SZ50 tires had close to a full inch less tread width compared to a BFG or Goodyear tire of the same size.
The Tire Rack has specification pagess for their tires by brand and type. One spec is the rim width range for a given size of tire. In most cases, the 285/40 tire shows a recommended rim size of 9.5 to 11" and the 275 tire shows a 9"-11" wheel width. IMHO, the high end of 11" is a bit too wide for either of these sizes.
The factory wheels should have the wheel width and diameter cast into the inside of the center.
Thread Starter
Safety Car
Joined: Aug 2006
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From: Port St. Lucie West Florida
C4ruiser,
If the stock rear tires were 285/40-17,(std equip)and I have 275/40-17 on the rear(also front)how would that affect the revs per mile.Just the width is different in the rear-same height.The fronts were supposed to be 255/45 from the factory.If that tire was on the rear I believe the revs per mile will change.Aren't all "40-17" the same height?
Thanks for your input
If the stock rear tires were 285/40-17,(std equip)and I have 275/40-17 on the rear(also front)how would that affect the revs per mile.Just the width is different in the rear-same height.The fronts were supposed to be 255/45 from the factory.If that tire was on the rear I believe the revs per mile will change.Aren't all "40-17" the same height?
Thanks for your input
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Originally Posted by aminnich
The 275s fit fine on the 9.5 rims, but really should not be on an 8.5 rim.
Originally Posted by LT4CompYell
Well, wait a minute. The Z51 option uses 275-40-17 tires at all four corners, right? Granted, the rims should be 9.5" all around as well. But that means the rears on a Z51 are 275-40 on 9.5" rims.
All `95 verts came from the factory with 8.5" 255s on the front, and 9.5" 285s on the rear.
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From: Sussex,Wi
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Originally Posted by enventr
C4ruiser,
If the stock rear tires were 285/40-17,(std equip)and I have 275/40-17 on the rear(also front)how would that affect the revs per mile.Just the width is different in the rear-same height.The fronts were supposed to be 255/45 from the factory.If that tire was on the rear I believe the revs per mile will change.Aren't all "40-17" the same height?
Thanks for your input
If the stock rear tires were 285/40-17,(std equip)and I have 275/40-17 on the rear(also front)how would that affect the revs per mile.Just the width is different in the rear-same height.The fronts were supposed to be 255/45 from the factory.If that tire was on the rear I believe the revs per mile will change.Aren't all "40-17" the same height?
Thanks for your input
The 40 indicates height of the tire in % of width, so a 275x40 is 275mm wide, the height is 40% of 275, or 110mm high. for a 285 tire, the height would be 114mm high.
Hence the difference in rotation speed/rpm differences.
(a mm is equal to .03937", so 4mm would be a diff. of .160")
(as for the width, it's .400" wider on a 285 compared to a 275)
Alot of times, you'll see 285-35 tires that are equivalent in height to a 275-40. these tire sets would be fairly close in height to each other.
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From: Lacey WA RVN 68-69
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The "40" is the sidewall aspect ratio and that value multiplied by the width of the tire cross section (not necessiarly the tread width) determines the tire diameter.But installing a tire on a rim width size that is outside of the recommended range will change the tire diameter because the sidewall may not be plumb with the wheel diameter.