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BTW, regarding rebound settings, I run 8 to 9 on the street and 10 to 15 on the track. I still haven't decided on exact street settings, but 8 to 9 is the right range. Exact track settings depend on conditions. Much more than 15, and I get wheel hop under braking on a smooth track.
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Last edited by Steve Dallas; 04-10-2017 at 06:56 AM.
Going on a trip now. At LAX. But upon returning will try dialing rebound to your recommendations.
5 and 6. Great to start by following actual feedback. Saves a lot of time.
Track wise will try it at Willow Springs. That is a fast track. Will be fun
Wheel hop is not fun. Some tracks have really smooth surfaces but others are wavy and that is a limitation.
How much different the car feels after the alignment. I was going to do it anyways but wanted to find a good alignment shop first.
I ended up finding one
I did not realize how much in or out of wack the toe was until the downpour made driving super scary. It was ****. Good thing is I noticed that issue while going slow. Had I floored the pedal before realizing how bad it was I would had skidded badly
Alignment mandatory after coil over stallation and it must be done immediately after installation .
Might be tempted to think.... "yeah.... not bad....will do it soon"
If you drive like that for a while you might end up trashing your car.
I'm a data guy. I like evidence, when claims are made. Here is some evidence.
This is a 225 tire mounted on a 15x9 rim:
And, this is a 255 tire mounted on a 17x9 rim:
I tried to get the perspective right for both photos, but it proved impossible with a handheld phone. What is important is, I was completely honest with the placement of the ruler.
As you can see, both tires offer about the same contact patch--even though there is a considerable difference in section width between them. This proves the rim width matters much more than the section width. In fact, going too wide for the rim with your tire width, which I have been doing for years, results in a muffin top that is prone to roll, which causes unnecessary outside edge tire wear (see tire edges in 2nd photo) and steering instability. And, it gains you an insignificant amount of additional contact patch for that sacrifice.
The 255 tire might have a shade more contact patch, according to my measurements. That could be achieved with a 235 tire, however, without sacrificing sidewall stiffness and all that goes with it.
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Last edited by Steve Dallas; 01-05-2017 at 09:42 PM.
You're on the right track, but you're mostly showing different size wheels will have different shape tires.
For instance, even the spec of 255/35r18 on MIchelin PSS has 2 tread widths, 9 and 9.5.
I've got a pic somewhere here that shows a closeup of my 225/40r18 tire at MSR 1.3 bending under because some numbnut dealer switched my stock 8 inch wide wheel for a 7.5 Enkei.
What the hell, I'll just put a 215/40r18 Michelin PSS on next time, and be plenty sticky.
Less is more, and at least those thinner Enkeis only weigh 19#'s.
Steve, you're comparing two different make/model tires. You haven't controlled for variables in how manufacturers size their tires. Some are known to run wider than others for the same size.
Steve, you're comparing two different make/model tires. You haven't controlled for variables in how manufacturers size their tires. Some are known to run wider than others for the same size.
That is absolutely true. It is still interesting to me how close a 225 and 255 are on the same width rims. It's not like I'm comparing a 225 to a 235.
The 225 Toyo has a published tread width of 8.9". Recommended rim widths are 7 - 8.5.
The 255 Maxxis has a published tread width of 10.5" Recommended rim widths are 8.5 - 10.
Yet, when measured on 9" rims, they both come in right at 8.75". I find that to demonstrate that rim width plays a significant role in determining the size of the contact patch and tendency of the tire to roll under cornering stresses.
Now that I am enjoying these Swedish suspension, and it sure delivers, aided by a pair of Racing Beat sway bars, and a fairly recent set of new tires, looking for a set of more aggresive wheels.
With these 245-40-18 tires and the stock wheels being 18 X 8 what would be a nice set up ?
I'm partial to 18X9.5 or 10" wheels with around a +40 offset. A +35 will fit with some tires.....and a +45 will fit with up to 285 tires.....and so if you stay in there you can get away with maybe a small roll on the +35 end or nothing at all on the +45 end
Anything smaller than a +35 will basically require that amount of fender work.....so a +25 will need about 1/2" of work...and a +15 close to an inch. At the +15 level you start to need to work on body seam areas and fender mounting tabs etc.
I run 18X10.5 wheels with a +43 offset and 285-645-18 slicks and they fit with minimal work....so the outside position would make those about equivalent to a 9.5 with a +30 offset
18x9.5 +45mm for 245/40/18 tires is what I run on my car.
Me too......
I have 2 sets of 18X9.5 +45 as well and run 265 or 275 series tires...they fit with nothing done to the car at any ride height. They really are perfect wheels as long as you aren't looking for them to be perfectly flush. I like the way they fit...especially for track tires
Any photos from the side ? Would like to see how the seat in reference to side of car
This set up looks clean
Plan on using these tires for a while Brand new
10 or 10.5 might be too much to the 245-40 I got ?
Seen pictures of 10 inch wheels and 245/40/18 tires, do not look stretched. In fact looks like factory 225/45's on 18 X 8 wheels
18 X 10 + 45 with 245/40/18 tires. Later on can move over to 265 or 285's
Yes, if you can find a 18x10 +45 you can fit the 245/40/18 on them without much stretch. Typically if you find a wheel width just slightly larger than the section width of the tire you can pull it off. The tire should handle very well.
you can also run a little lower PSI and not "fold" the tire over with the slight stretch.
Any brands come to mind ? Light wheels 18 X 10 Black coated (no chromes for me)
I have not been keeping up with wheel brands for a while
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I don't know of a 18x10 +50 option that is too affordable.
I do know you have 18x9.5 +45 RPF1, 18x9.5 +45 Advan RS,RZ, etc. You have some special runs of 17x10 Advan RS/RZ models that were for S2000's. I know a 18x10.5 +47 PF01 was made for some mustangs that would fit our cars.
I wouldn't mind running the 18x10.5 +47mm PF01 with a 265/35/18 or 275/35/18 tire. that should be a really good set up.
I don't know of a 18x10 +50 option that is too affordable.
I do know you have 18x9.5 +45 RPF1, 18x9.5 +45 Advan RS,RZ, etc. You have some special runs of 17x10 Advan RS/RZ models that were for S2000's. I know a 18x10.5 +47 PF01 was made for some mustangs that would fit our cars.
I wouldn't mind running the 18x10.5 +47mm PF01 with a 265/35/18 or 275/35/18 tire. that should be a really good set up.
Thanks
Could not find info on weight for the PFOI wheels Probably on the light side
The 10.5 +47 18's PFOI sound good but I'd need new tires for those unless I could use my 245' s on them for a while (brand new)
If 9.5 in wide works fine 10 in or even 10.5 I may infer would do as well provided the tire is not too large Inclined to go 10 rather than 9.5 for return on investment (may look a little fuller)
On the 17s That could be another option Like a second set
On that line I could use more rubber than on 18's If 265-35 is used on 10 in wheels (18) then for same width in 17 in dianeter I could use a 265-40 or even 45 ? 275-35-17 ?
Using 17's might allow wider selection with less body intrusion prob allowing even 17 X 11 easier than a 18X 11
Keep in mind that wider tires do grip better around corners as long as the tire is up to temp. I don't know the end use for you but a wider tire and wheel set up might not be advantageous as a skinnier tire/wheel combo if you cannot get the heat into it for autox or events like that.
a 245 wide tire fits great on a 9.5" wide wheel. a 10" is 255 size, 10.5 is 265/275 wide.
you can still pull great numbers with a 245 on a 9.5" wheel, that is what I am running and I think it looks great.
That would entail several other mods too body wise
About offset, stock wheel has +50 mm That is about 2 inches
So if an 8 inch wheel has that offset, the backspacing should be 6 inches behind the hub
2 inches upfront So on a 10 inch wheel for ie, I would need have no more than 6 in backspace or else it would not fit (also depending on tire aspect ratio )
With sinilar aspect ratio then I would like having 6 in backspace So I'd have 4 in upfront
Heard and read some going for less offset Why ? Anyone looking for a 10 in wide wheel with less offset should go for an 11 in wheel with stock *50 offset right?
9.5 or 10 or 10.5 or even 11 in wheels in +50 ate hard to get ?
12-23-2016, 09:49 PM
