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Proper aspect ratio for stock 17 inch wheels - is 45 ok?

 
johnfmoynihan
New User
Posts: 6
Joined: 06/10
Posted: 03/06/11 12:48 PM

Hi all:

I'm looking to buy some summer tires for my 2006 Mustang GT convertible automatic.  My only performance mods are a Roush CAI and DiabloSport Predator using the 93 octane tune.

The Dunlop Direzza Sport Z1 Star Spec tires look right to me, but the closest size to stock is 235/45ZR17.  Is it okay to reduce the aspect ratio from 55 to 45?  I can correct my speedometer using the DiabloSport Predator.  If my math is correct, the smaller diameter will be like a 6% gear reduction (almost like putting in 3.55 gears).  And obviously there will be a bigger gap in the wheel wells.

Any advice or potential issues would be appreciated.

Thanks.

John  

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firehorse5_0
User
Posts: 56
Joined: 03/10
Posted: 03/07/11 05:36 AM

What is your stock tire size?  

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johnfmoynihan
New User
Posts: 6
Joined: 06/10
Posted: 03/07/11 06:45 AM

My stock tire is 235/55-17  

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firehorse5_0
User
Posts: 56
Joined: 03/10
Posted: 03/09/11 11:35 AM

I would look for some 245/45-17s, but the 235/45 should work fine especialy if you can correct your speedo.  

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johnfmoynihan
New User
Posts: 6
Joined: 06/10
Posted: 03/09/11 05:04 PM

Thanks!  

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