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295/45/18 vs. 285/40/18

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Old 02-18-2011, 06:03 PM   #1
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Default 295/45/18 vs. 285/40/18

First of all, I had a set of 20's on my '05 Gt vert and I didn't realize how terrible they rode until I put my 17" stockers back on. Unbelievable night and day difference! So now I want to order a set of 18" FR500's and can't decide what size to go woth out back. I have 4.10's and kinda like the mean look of the larger tires in the rear but are there any cons? Anybody got pics? Thanks guys.

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Old 02-18-2011, 10:30 PM   #2
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295/45 is going to be noticeably taller then the 285/40. No con is is the overall tire diameter is great er then the standard then it shrinks your gear ratio so your 4.10 will act like 3.90 for example.
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Old 02-18-2011, 10:44 PM   #3
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I was also on the fence between the two sizes but decided on the 285/40/18 as it's nearly stock size and as SpartaPerformance stated, gear ratio would have affected with the 295/45/18.
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Old 02-19-2011, 12:21 AM   #4
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295/45/18 is huge. Not only does it drop your gear ratio but it adds extra rotating mass to the driveline. The car will accelerate slower.

Ideally, you want to go with the smallest diameter and lightest wheel/tire setup you can get away with (ie, maintain traction) to maximize performance. That is, if it is your main concern.

Those FR500 wheels are probably boat anchors. I bet they weigh easily 23 lbs. Probably more.
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Old 02-19-2011, 07:26 AM   #5
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Not really concerned about performance as much as looks. The car works good with the 4.10, tuner, and CAI and I like the idea of gaining some gear as the 4.10's are steep. I'd actually like to see some cars with both those sizes.
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Old 02-19-2011, 07:32 AM   #6
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As much as I like the taller sidewall of the 45's, I'd go with the 285/40's simply due to remaining closer to the stock OD. And you'll want 255's up front.
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Old 02-19-2011, 08:55 AM   #7
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Just put on the 295's, so here's what I can tell you so far. Looks amazing on stock springs, definatley gives her an oldschool look. They are heavy as a mf'er so from a performance standpoint, not your first choice...but the grip is awesome, and that's gotta count for something with your current gear. I got them with this in mind as I plan to swap my gear to a 3.73 this summer which should drop it to 3.5? with the bigger tire, good for everyday fun i would think. Then go back to the stockers at the track to get maximum benefit of the new gear for that fun
The con in my eyes so far is gonna be brake wear. You can tell the brakes are working harder to stop all that meat, and only time will tell how big of an impact they will make on the brake pads/rotors...nothing some powerslots and pads can't handle though.
Bottom line if you are not dropped and want the looks, get them. If I was already dropped and inch or more, I would get the 285's. Hope this helps.


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Old 02-19-2011, 10:15 AM   #8
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get the 285/40/18s. they are basically the same width (11.42" vs 11.54"), just arent super tall and heavy like the 295/45/18s.
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Old 02-19-2011, 11:32 AM   #9
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295/45/18 NT05

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285/40/18 Goodyear Supercar

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Old 02-19-2011, 11:50 AM   #10
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^ def needs to be lowered! lol. good pics though showing the sidewalls.
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Old 02-19-2011, 01:25 PM   #11
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Never gonna be lowered unless I'm forced into it for some reason. The roads here are rough and I don't wanna have to worry about scraping every time I go in and out of a parking lot because the angle is sharp.
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Old 02-19-2011, 06:58 PM   #12
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Quote:
Originally Posted by Riptide View Post
295/45/18 NT05

Click the image to open in full size.

Click the image to open in full size.

285/40/18 Goodyear Supercar

Click the image to open in full size.
Good god.. how do those bad boys hook up at the track??

With that much rubber, who the hell needs drag radials? lulx

I was gonna purchase a pair of MT drag radials on some 17x8 bullitts, but the tires you have looks like they could hook!
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Old 02-19-2011, 08:33 PM   #13
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Thanks for the help guys although I'm still not sure what to do.
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Old 02-19-2011, 11:55 PM   #14
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Quote:
Originally Posted by dutch View Post
First of all, I had a set of 20's on my '05 Gt vert and I didn't realize how terrible they rode until I put my 17" stockers back on. Unbelievable night and day difference! So now I want to order a set of 18" FR500's and can't decide what size to go woth out back. I have 4.10's and kinda like the mean look of the larger tires in the rear but are there any cons? Anybody got pics? Thanks guys.

Mark
Quote:
Originally Posted by SpartaPerformance View Post
295/45 is going to be noticeably taller then the 285/40. No con is is the overall tire diameter is great er then the standard then it shrinks your gear ratio so your 4.10 will act like 3.90 for example.
The benifit of a taller tire is more contact patch. On the street he won't notice a bit of difference in gear ratio.

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Thanks for the help guys although I'm still not sure what to do.
Pick the brand and tire first, then look at the spec for each and decide. You really can't choose a bad one in this situation.

If you are lowered, the 295/45 may rub, doubt it, but it might.
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Old 02-20-2011, 01:02 AM   #15
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I may buy 295/45/18 for my next set of rear tires. I really don't care about hooking since I have both M&H race masters and M/T ET streets for the track.
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Old 02-20-2011, 07:55 AM   #16
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Quote:
Originally Posted by dutch View Post
Thanks for the help guys although I'm still not sure what to do.
Lets try some more pic's then. Here's some more pics with the 295's out back.

Stock springs:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Lowered:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

I was out rompin around last night for the first time on them and can say there is no "felt" change in performance other than more GRIP, but I have dead *** 3.31's. Does lower my rpms's at highway speeds, turning about 1900rpms at 70mph. Before on stock it was about 2100 rpms at the same speed. Like I said before bro, if you have stock springs and do not plan to drop...get em!
If you have already lowered your ride stick with the 285, it looks just as good once you remove the wheel gap with the drop.

Click the image to open in full size.

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Old 02-20-2011, 02:09 PM   #17
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Quote:
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.....

On the street he won't notice a bit of difference in gear ratio.


....
He may not being it sounds he's more into aesthetics but if I'm going to go through $$$ and time to do 4.10's I want every benefit from those cogs.
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Old 02-20-2011, 02:31 PM   #18
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This swayed my decision to 18" rims with a drop. Nice cars!!
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Old 02-26-2011, 10:54 AM   #19
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Funny, I just went through this same question. I bought the chrome bullitt deep dish rims from AM and wanted the best look. I am lowered about 1 1/2" so I did choose the 285/40/18. As stated before, this is very close to the stock size for height and is quite a bit wider. I didn't want to worry about hitting although I did read many posts that they wouldn't hit. I also have 4:10's and didn't want to give up any gear as that is where all the fun is. I am hoping to actually get some traction now as I went with the NT05R's out back with the regular 555's in front (245/45/18).

I can't wait for it to get warm so I can get them on and see what it looks like/rides like/will it hook?
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Old 02-28-2011, 06:19 PM   #20
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what tire brand/model were thinking in 285/40 size?

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Old 02-28-2011, 06:19 PM
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