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hey everyone
total noob question but

ppl have been telling me for a 7th gen i should be running 215/45/17
but i already ahve tires that are 205/40/17

the rim is 17X7
and i plan on dropping it on tein basics

is this okay?

 
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well i have that size tires on 17x7 on kumho exscta, and i wish i had bigger tires, since with this size being too small, youll get wrong speed judgement. so i'd suggest some bigger tires if you can, im tryin to get some more tires, i want the 215/45/17. i think itll be smoother and potholes wont be as dangerous if you dont avoid them.

 
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wow man 205 40 17 is sooooooo unsafe wow take it easy there cowboy

 
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you'll be fine....ive been running 40 sidewalls forever around this terrible part of the country....just be careful of where ur going......i think 45 looks too big

 
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Since you already have the tires I suggest you just go with them until they wear out. Then you can decide if you want something bigger. I currently have 205/40-17 Kumhos and they are fine, but I might go to a 215/45-17 when these wear out. Like the others said, just be careful with potholes and where you drive.

 
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what he said ^ i am on my third set of that size. I only use it because my car is pretty low.

 
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205-45-17's are the best bet out there, and closest overall dia. to stock. They are the perfect amount of rubber, not too bulky. 205-40-17's suck, especially if your on stiffer springs, I like to call them wagon wheels.

 
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I think half of the people who are running 17" are using 205/40/17 mainly due to its affordibility and because its a little thinner. It should be definately safe. If you want 205/45/17, then plan on spending more than 215/45/17, since 205/45 is not really a common size.

I got 215/45/17 because it's pretty affordable, and i like it a little thicker.

 
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yeah, the 205/45 size is limited on choice (at tirerack.com at least) plus the price skyrocketes compared to 205/40. pretty much the reason i'm using 40 series. oh well, time for new wheels.

 
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205/40/17 - more of the show look and horrible without drop
205/45/17 - perfect for daily driver whose looking for aftermarket wheels for looks and not performance
215/40/17 - leaning more to the performance and street size
215/45/17 - still looks somewhat good with no drop, doesnt give a **** about performance, just want fat sidewall for rim protection and whatnot.

 
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I've had 205/40-17's for 2 years now. The ride is a bit harsh and wish I had 45's. But to answer yr question they are OK meaning they're safe and so far have held up on rough roads. Keep tire preasure above 36 psi to protect rims.

 
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does 215/45/17 make the car accelerate slower?
how do all these sizes affect fuel economy?

 
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^just about any car with larger wheels would give your vehicle a harder time to push the wheels to move. inertia or something like that, i think its in the sticky faq page.

depending on which 17s you get, some can affect your acceleration/mileage depending on weight, material, size, etc. in general, cast rims (rota/adr/rh evo/velox/etc) are more heavier than forged/multi-piece/3-pc/etc rims in general.

 
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thanks for the info everyone

ive decided just to run the 205/40/17s
on my gram lights 57pro

but my next tires will def be bigger

 
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Get some 275/40/17 in the front.....