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Can't figure this out...the stock 17" tire is a 205/50. How come
the plus sizing shows 225/45??? I have 16s and what to go to 17s, what tire size? 205/50 215/50 225/45 |
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I'm pretty sure all those you mentioned will work well and keep the speedometer and Odometer almost correct. Not sure of the exact science but the 205 (normal) and 215 (just a tab wider) will keep everything the same, but when you get bigger (225) it messes up the equation and you need to go to a smaller ratio (45) to keep it all equal. [:I]
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What you want to do is keep the diameter (and circumference) of the tire/wheel the same whenever you change sizes. Changes to the diameter will effect the final drive ratio which effects the speedo, milage, power output, etc.
Here's a link to a tire size calculator to compare different sizes. http://www.miata.net/garage/tirecalc.html Simply put in the numbers of the stock/starting tire and the "new" preposed size. If you want a wider tire, put in the desired width and try a few different ratios to check out what happens to the diameter. You want to stay close to stock diameter. |
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Remember the stock 17's are very narrow (6") so 205's are as wide as you can go with those wheels.[8)]
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06 GT Auto, Cool Vanila Exterior, Presto Change O 3bl, Cargo Mat and Net, Billet Oil Cap, Yoko Avid 4Vs Tires, 03 GT Wheels, 4 Chrome Door Handle Screw Covers, MOPAR Mud Flaps, H&R Rear Sway Bar, Freedom Strut Tower Bar, Rear Door Sill Covers. |
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\"If you choose not to decide, you still have made a choice.\" |
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![]() 2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe. |
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My Bad, of course you can upgrade to 215's that is what I did!! But the point I was trying to make is that you cant go to plus 1 or plus 2 sizing with those skinny wheels. So there is no upgrade available as far as going to a lower aspect ratio. Lost the forest cause of all those trees again. Sorry! [:I]
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06 GT Auto, Cool Vanila Exterior, Presto Change O 3bl, Cargo Mat and Net, Billet Oil Cap, Yoko Avid 4Vs Tires, 03 GT Wheels, 4 Chrome Door Handle Screw Covers, MOPAR Mud Flaps, H&R Rear Sway Bar, Freedom Strut Tower Bar, Rear Door Sill Covers. |
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Thanks alot for all the info. I think I got it. Tell me if this is right...
The stock 17" wheel is 6" wide and rolls on 205/50-17s. If I go to a 7" or 7 1/2" wheel I should roll on 215/50-17s of 225/45-17s ! |
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Here is my idea go with 225/45/17 with 7" wheel width. You will gain handling with the extra width and lower aspect ratio and also stay within a .5% of the stock 17" wheel\tire rolling diameter. Depending on the tire, comfort should be pretty good too!! I feel that if you are going to buy other wheels why not get a big benefit in handling too for your money??
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06 GT Auto, Cool Vanila Exterior, Presto Change O 3bl, Cargo Mat and Net, Billet Oil Cap, Yoko Avid 4Vs Tires, 03 GT Wheels, 4 Chrome Door Handle Screw Covers, MOPAR Mud Flaps, H&R Rear Sway Bar, Freedom Strut Tower Bar, Rear Door Sill Covers. |
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