Tires |
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Tires |
partwerks |
Aug 25 2014, 08:03 PM
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#1
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I currently have on the front: 205/55 ZR16
Back: 225/50 ZR16 I was wondering if there is a better size for fit than what I currently have? |
smj |
Aug 25 2014, 09:01 PM
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#2
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"Dude, Steve from Berkeley." Group: Members Posts: 591 Joined: 28-August 05 From: Berkeley, CA Member No.: 4,691 Region Association: Northern California |
From the tiny image at left, it looks like your rear fenders (at least) might have a mild flare. Can you confirm? (Apologies if your build thread or equiv is well known.) This will have a lot to do with what might fit...
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partwerks |
Aug 25 2014, 09:10 PM
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#3
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
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partwerks |
Aug 25 2014, 09:12 PM
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#4
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
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JRust |
Aug 25 2014, 10:23 PM
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#5
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914 Guru Group: Members Posts: 6,305 Joined: 10-January 03 From: Corvallis Oregon Member No.: 129 Region Association: Pacific Northwest |
I am running 225/50/16's up front & in back. I plan to go to 245/40/16's in back. Pretty sure they will fit but all depends on the tire company & the tire. That is on 16x8 fuchs on all 4 corners
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matthepcat |
Aug 25 2014, 11:54 PM
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#6
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
I am running 225/50/16's up front & in back. I plan to go to 245/40/16's in back. Pretty sure they will fit but all depends on the tire company & the tire. That is on 16x8 fuchs on all 4 corners I am running 16x8 Fuchs on mine with 245/45/16 Hoosiers. I think you will fit with a flair. |
partwerks |
Aug 26 2014, 06:16 AM
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#7
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
Dumb question, but I know they are 16", but how do I know if they are 8", as in is it stamped on the wheel somewhere? I'm guessing they are.
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mepstein |
Aug 26 2014, 06:20 AM
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#8
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914-6 GT in waiting Group: Members Posts: 19,255 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Dumb question, but I know they are 16", but how do I know if they are 8", as in is it stamped on the wheel somewhere? I'm guessing they are. Yes. Looks like the fronts are 7, rear 8. Classic combo. I'm running the same width wheels and tires but adding a 1" spacer behind the front wheels to fill out the flare a bit. Great looking car btw |
Kansas 914 |
Aug 26 2014, 09:13 AM
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#9
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Advanced Member Group: Members Posts: 2,999 Joined: 1-March 03 From: Durango, Colorado Member No.: 373 Region Association: Rocky Mountains |
I have fiberglass flares with 7" wheels front and 8" wheels on the rear.
Front: 225/50/16 Rear: 245/50/16 I could stand to push the wheels out a little with spacers to fill the flares. |
partwerks |
Aug 26 2014, 08:51 PM
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#10
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
Are the first 3 numbers related to the width of the tire?
If so, I could go to a wider tire for the front, or add a spacer in there somewhere? I think it would look a bit better if it was closer to the edge of the flair. The color black is going by the wayside to somewhere between silver, and closer to gray. |
GeorgeRud |
Aug 26 2014, 09:40 PM
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#11
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Spacing the front tires further out will fill the flares better, but will increase your steering effort.
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Kansas 914 |
Aug 27 2014, 09:27 AM
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#12
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Advanced Member Group: Members Posts: 2,999 Joined: 1-March 03 From: Durango, Colorado Member No.: 373 Region Association: Rocky Mountains |
Are the first 3 numbers related to the width of the tire? If so, I could go to a wider tire for the front, or add a spacer in there somewhere? I think it would look a bit better if it was closer to the edge of the flair. The color black is going by the wayside to somewhere between silver, and closer to gray. 225/50R16 = 24.9X8.86R16 Diameter = 24.9" Width = 8.86" Wheel = 16" Sidewall = 4.43" Circumference = 78.1" Revs/Mile = 811.7 245/50R16 = 25.6X9.65R16 Diameter = 25.6" Width = 9.65" Wheel = 16" Sidewall = 4.82" Circumference = 80.5" Revs/Mile = 786.8 The first three numbers in a typical size (225/45R17) are the tire's indicated section width in millimeters, measured from sidewall to sidewall. If you are familiar with measurements in inches, the section width in millimeters can be converted into inches by dividing it by 25.4. For example: 225mm / 25.4 = 8.86" The second pair of numbers (225/45R17) is the tire's aspect ratio or profile. This percentage represents the ratio of sidewall’s section height to the tire’s section width. The section height can be calculated by multiplying the section width by the aspect ratio percentage. The answer will be the height of one sidewall. For example: 225mm x 0.45 = 101.3mm 8.86" x 0.45 = 3.99" The last number (225/45R17) is the diameter of the wheel in inches. If you are familiar with measurements in the metric system, the wheel diameter can be converted into millimeters by multiplying it by 25.4. For example: 17" x 25.4 = 431.8mm To calculate the overall diameter of a tire, the sidewall height must be multiplied by 2 (remembering that the tire diameter is made up of 2 sidewalls, the one above the wheel and the one below the wheel touching the ground) and add the diameter of the wheel. 101.3mm + 101.3mm + 431.8mm = 634.4mm 3.99" + 3.99" + 17" = 24.98" |
matthepcat |
Aug 27 2014, 10:19 AM
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#13
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
Or just use this calculator: http://www.miata.net/garage/tirecalc.html
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partwerks |
Aug 27 2014, 10:18 PM
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#14
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I wonder which would be better, a spacer or just a bit wider tire?
Like from my 205, to a 225, must gain about 5/8" wider tire for every 20? So a 40 would be a taller tire? |
partwerks |
Aug 28 2014, 06:38 AM
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#15
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I wonder how a low profile tire would look on it?
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matthepcat |
Aug 28 2014, 09:42 AM
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#16
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
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partwerks |
Aug 29 2014, 04:04 AM
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#17
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I wonder how a low profile tire would look on it? Spacer will give you more of a wheel flush with the body, but you have to be careful that it might be too far out and rub on turns. What low profile tire size are you looking at? Was asking about what size to use. Where would wheel spacers be gotten at? |
matthepcat |
Aug 29 2014, 09:07 AM
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#18
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Meat Popsicle Group: Members Posts: 1,462 Joined: 13-December 09 From: Saratoga CA Member No.: 11,125 Region Association: Northern California |
You can find spacers at the car junk yard off of 944's. Really depends on what size you need. Ebay tends to have used Porsche factory units.
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partwerks |
Aug 29 2014, 09:28 PM
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#19
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
Just have to figure out the depth, but something comparable to this:
http://www.ebay.com/itm/PORSCHE-M12-x1-5-3...c9f&vxp=mtr |
mikesmith |
Aug 29 2014, 10:30 PM
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#20
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Member Group: Members Posts: 202 Joined: 5-September 13 From: SF Member No.: 16,354 Region Association: Northern California |
Was asking about what size to use. It's hard to guess just looking at your pictures. A good start would be "how much clearance do you have with your current tires"? Check the clearance around your tires, including at both left and right lock extremes. Don't forget to check the gap between the tire and shock absorbers. Now you know how much room you have to grow. If the gaps are asymmetrical, then using a spacer to move the wheel out may give you a bit more. Don't forget that tires move around; 1/2" clearance is about the minimum you want to avoid rubbing, and you may need more depending on sidewall height and driving style. |
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