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How long do the all season 205/45/17 generally last if you don't race or hit a big object in road?

 
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it depends,

road condition
weather
driving habits
which tire(s)
etc

what are you trying to figure out?

 
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Basically how long you can squeak out a set of these tires if you drive like a granny.

 
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Probably near 20k if you have good camber. That's how much I get. Also depends on the tire your getting because softer tires will wear down much faster, but better grip.

 
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so your pretty much worrying about threadwear over handling/performance. www.vulcantire.com has falkens for cheap. when looking at an tire, read the threadwear rating... higher the better.
www.tirerack.com www.1010tires.com <---- they have basics about tires. what you should know etc etc.

if your lowered, a camber kit (front is unnesscessary..well for me) can save your tire life. im pretty sure you know what negative camber is.. if not, just say so.

 
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No, its gotta be more than 20K. I have Kumho Ecsta Supra 205/40/17 on my car right now. So far I've hit 24K and only the insides were wearing out b/c I set my camber -.5 in the rear, so I flipped the tires inside out, so I should get abou another 24K on them. I'm pretty much a granny driver, but I take corners fast thats all.

 
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I just put on Kumho Ecsta Supras (205/45/17) I believe because a friend of mine who works at a tire store said they had very long life and handled very well, especially on wet streets.

 
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I got about 20k on Falken Ziex 512. My tire size was 205/45/17.

 
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I'd say 30k+ if you don't race