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Discussion Starter #1
Anyone know off the top of your wonderfully intelligent brains what would be the optimal size of tire to run with a 17x7 rim? I will be acquiring the rims in a few weeks and will need some tires... I am looking for a mild performance improvement over my Pep Boy brand "touring (read no traction)" tires...

Sam
 

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245/45-17 (all 4 or just front, too short IMHO, great selection)
245/50-17 (my suggested all 4, poor selection)
275/40-17 (rear, kinda short, expensive)
------ Thanks GreenBird

I would run 275 40 17 in the rear and 245 45 17 in the front.
Some people say that they scrape, but I have been running them for 1/2 year now with no problems. Go to tirerack.com and do a search or just go to the upper right hand corner and do a serch.
 

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Discussion Starter #4
You guys are so wise, I really appreciate you helping a lazy SOB out... I know to search, I just am lazy today... But anyways thanx.

Sam
 

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Discussion Starter #5
So I did as was told and went to tire rack... They tell me 235 55... Why you guys say 245? And then the 45-50?

Sam
 

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Ok so I felt bad about being so lazy and have since done some searching... Are you guys recommending the 245 because of availabilty and hence cost? Plust I assumer it being wider better handling? Would that still be your reccomendation even with the rim only being 17x7 ? Also does it change your opinion if I told you the car will be lowered with Eibachs at the same time? Thanx for the replies.

Sam
 

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just keep in mind that i make a mistake when i bought the wheels and tires back then. i bought 255/45/17 from tirerack and then the wheel 17x7 without checking fitment issue(because i was too excited about all these). when i brought it to mount they cannot even mount the tires on it. so i have to send the tire back to tirerack(cost me extra shipping and waiting time) and bought from the store instead. 255/50/17. just make sure don't make the same mistake as me. the 255/50/17 on my 17x7 will not let the alignment machine to put on. i have to swicth to my stockers to get alignment done then switch back again. but it looks cool with it because the spoke curve same level as the 255 fit on there.
 

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IMHO, 245/50R17 are the perfect tires. I have those on both my cars, mounted on Ford SVT 17x7 Cobra Rs. No fitment or alignment problems at all. Personally, I think 245/45R17 tires are too short, and leave too much fender gap.
 

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Why 245mm?
1. Largest that will fit up front. Some have had problems with 255s others haven't, so 245 is the safe advice.
2. A 245 is actually the perfect width for a 7" wheel.
3. Anything wider than 245, and selection goes down quickly, and price goes up even quicker.

Carlover007 said:
245/45-17 (all 4 or just front, too short IMHO, great selection)
245/50-17 (my suggested all 4, poor selection)
275/40-17 (rear, kinda short, expensive)
------ Thanks GreenBird

I would run 275 40 17 in the rear and 245 45 17 in the front.
Some people say that they scrape, but I have been running them for 1/2 year now with no problems. Go to tirerack.com and do a search or just go to the upper right hand corner and do a serch.
Notice I didn't mention the 275? that's because the other thread was about 17x9s and this one is about 17x7s. No way in h3ll will a 275/40 fit on a 7" wide wheel.
 

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Discussion Starter #10
Thank you Greenbird for explaining. I assume the 45 50 55 is a preference? How much fender gap you prefer or is there a scientific reason for preferring one over the others...

Sa
 

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Well I'm getting 28" tall tires once the current ones are done. Because I want to close fender gap, but NOT lower the car. Besides, lowering may close the vertical fendergap, but the only thing that closes the horizontal gap is BIGGER tires. I see pictures of lowered cars with 25" tires and they look odd because there are huge gaps on the sides.

The difference between 45 series and 50 series is mainly the selection. I would go bigger, like a 245/55, but that's because of my personal pref, and the roads in VT are pretty bad, so more sidewall gives a better ride.
 

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245/45 is too wide for a 7" wheel. Ideally an 8"+ wheel, but 7.5 is the thinnest wheel you should put it on. I thought I knew it all and tried to put 245/40R18's on a 7.5 wheel. I eventually took them somewhere and got them put on.

Go with the 235/55
 

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wkenneth said:
245/45 is too wide for a 7" wheel. Ideally an 8"+ wheel, but 7.5 is the thinnest wheel you should put it on. I thought I knew it all and tried to put 245/40R18's on a 7.5 wheel. I eventually took them somewhere and got them put on.

Go with the 235/55
I have 245/50R17 tires on both my cars with SVT 17x7 Cobra Rs and no problems at all.
 

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wkenneth said:
245/45 is too wide for a 7" wheel. Ideally an 8"+ wheel, but 7.5 is the thinnest wheel you should put it on. I thought I knew it all and tried to put 245/40R18's on a 7.5 wheel. I eventually took them somewhere and got them put on.

Go with the 235/55
Ehhh...both my Thunderbird and Cougar are wearing 245s on 7" wide wheels, they fit absolutely fine.
 

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wkenneth said:
245/45 is too wide for a 7" wheel. I thought I knew it all and tried to put 245/40R18's on a 7.5 wheel.
That's the maker's suggestion. you can usually go .5" beyond what they suggest without issue.
 

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wkenneth said:
245/45 is too wide for a 7" wheel. Ideally an 8"+ wheel, but 7.5 is the thinnest wheel you should put it on. I thought I knew it all and tried to put 245/40R18's on a 7.5 wheel. I eventually took them somewhere and got them put on.

Go with the 235/55
I have had 4 sets of tires on my 17x7 SVT rims....all were 245/45/17...I am more concerned about the load index of the tire than anything else. Minimum should be 95, since the OE tires load index is 95. Falken offer a 245/45 with a 99 index. Nitto's NT555 245/45/17 has an index of 89. The ability of the tire to carry the load should be most important.

joseph
 
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