[dphoenix]

yep, i am saving a little money, plus they refunded the shipping on the original order so it will be just like i ordered the right ones in the first place.
discount tire swore up and down that it would be off by an inch. I don't care if they're 100% flush but I don't want them way out of line either. oh well. we will see what happens when the 18x8.5s get here, since I think I'll be stuck with them.

[Garrett]

Originally Posted by caveguru

you're fine with the +45 9.5" MT1's- no rubbing, no roll necessary. That's what I have with 275's, which require a slight roll. pictures of these installed are in my member's journal (link in sig<<<). The factory offset is +55, so these only stick out 10 mm past factory, not 1" like you were informed. They will not quite be flush, although they will be closer to flush. But putting 245's on a 9.5" rim is a waste of wheel weight unless you plan to install 265+ tires later.



Frank

Wait, wouldn't the difference in a +45 offset and a +55 offset only be 5mm farther out?


Secondly, do you think you would've had to roll the fenders if you had an +48 offset, given your 275s...?

[caveguru]

Originally Posted by Garrett

Wait, wouldn't the difference in a +45 offset and a +55 offset only be 5mm farther out?


Secondly, do you think you would've had to roll the fenders if you had an +48 offset, given your 275s...?

offset is a linear measure of the change in the centerline of the tire. every mm of offset moves the wheel and tire 1 mm. you may be thinking of the effect of changing tire width. If you go from 245's to 275's, for the same wheel, you would decrease your inside and outside clearance by ~15 mm each.

Good question- I'm really not sure if +48 would clear. I knew 45 wouldn't from other's experience and I'm planning on running 295 track tires later, so I didn't bother to check just how little clearance there was. After the roll I had at least 1/2" to spare (!). Again, this is all talking about the rear fenders. On the inside on both the front and rear and on the outside on the front I also had at least 1/2". I'm expecting to have less in the front with coilovers, but that's what camber plates are for . The only other place that came close was the inside front fender well, where the clearance is down to ~1/4" now that I have the ALK kit. This clearance is when the wheel is turning though and tire width may not decrease this linearly. In other words, you may be able to add 10 mm of outside tire width and only lose ~6 mm of visible clearance. At least, that's what I'm hoping for mounting the 295's. Also, the 295's will be 295/30/18's, which have a smaller overall radius, which should help.

Frank

[Chayse]

Originally Posted by caveguru

you're fine with the +45 9.5" MT1's- no rubbing, no roll necessary. That's what I have with 275's, which require a slight roll. pictures of these installed are in my member's journal (link in sig<<<). The factory offset is +55, so these only stick out 10 mm past factory, not 1" like you were informed. They will not quite be flush, although they will be closer to flush. But putting 245's on a 9.5" rim is a waste of wheel weight unless you plan to install 265+ tires later.

Frank

Frank,
You are forgetting that the outside edge of the wheel would be farther out due to the increased wheel width. A 9.5" wide wheel with a +45 offset has the outer edge of the wheel pushed out about 23mm (almost 1 inch, 1 inch is 25.4mm) from where the stock outside wheel edge is. 10mm out for the offset of the centerline of the wheel and another 12.5~13mm for the increased wheel width ( 1 inch extra width divided by 2, inside and out side). The inside of the wheel will be almost 3mm more inboard of where the stock wheel is, +10 mm for off set then -12.5~13mm for the extra width. The 8.5" +48 offset wheel will only have its outside edge 7mm out from where the stock wheel is now. The difference in these two wheels will be about 16mm or about 5/8ths of an inch, the 9.5" wheel will stick out that much further than the 8.5" Either way, you should be fine running the stock tire size of 245/40-18 and not rubbing without fender mods.

[martind]

18x9.5 +45 Enkei rpf1

Anyone try it?

[ITSHON]

Originally Posted by martind

18x9.5 +45 Enkei rpf1

Anyone try it?

I test fitted the 18x9.5 +38 and the front will not clear the Brembo the rear is fine. I was also told that the +45 will still not clear without a spacer for the front.

[BobaSti]

Originally Posted by Chayse

Frank,
You are forgetting that the outside edge of the wheel would be farther out due to the increased wheel width. A 9.5" wide wheel with a +45 offset has the outer edge of the wheel pushed out about 23mm (almost 1 inch, 1 inch is 25.4mm) from where the stock outside wheel edge is. 10mm out for the offset of the centerline of the wheel and another 12.5~13mm for the increased wheel width ( 1 inch extra width divided by 2, inside and out side). The inside of the wheel will be almost 3mm more inboard of where the stock wheel is, +10 mm for off set then -12.5~13mm for the extra width. The 8.5" +48 offset wheel will only have its outside edge 7mm out from where the stock wheel is now. The difference in these two wheels will be about 16mm or about 5/8ths of an inch, the 9.5" wheel will stick out that much further than the 8.5" Either way, you should be fine running the stock tire size of 245/40-18 and not rubbing without fender mods.

Isn't it 0.5" increased wheel width which is 12.5~13mm for the whole rim?? So divide in half it's about ~6.5mm wider from 9" to 9.5" for the same offset wheel??

[mofoSTI]

looking at a real good deal on a new set of rpf1's in 18x9 +35 I dont mind having to run spacers if they jive with the front calipers

[hairlesswookiee]

anyone have suggestions for 5 spokes with dish??? i had Axis Hiros on my last car so anything else that will fit is appreciated.

[hef]

so are most people rolling around with the low pressure light on? or did a lot of you guys use your stock stems?

[vmaxlvrs]

Originally Posted by hef

so are most people rolling around with the low pressure light on? or did a lot of you guys use your stock stems?

I just got my tires replaced yesterday and this morning the pressure light came on. Subaru dealer said to check the tire presure and see if they are all the same or to let it go for a mile and it will reset itself.

[Chayse]

Originally Posted by BobaSti

Isn't it 0.5" increased wheel width which is 12.5~13mm for the whole rim?? So divide in half it's about ~6.5mm wider from 9" to 9.5" for the same offset wheel??

Boba,
The two wheels that i was referring to were an 18x8.5 and an 18x 9.5. For a 9 and 9.5" wide rim you would be correct.

[denver133]

Has anyone tried a set of BBS RE's on the new 08? Tirerack has always had that wheel as an STI option, why not for 08?

[L-SCHLEGS]

if i was going to put on work emotions cr kais 18x9.5 what all will i have to do suspension wise and stuff? ive got it on bc racing coilovers. goin with bronze.

[caveguru]

Originally Posted by Chayse

Frank,
You are forgetting that the outside edge of the wheel would be farther out due to the increased wheel width. A 9.5" wide wheel with a +45 offset has the outer edge of the wheel pushed out about 23mm (almost 1 inch, 1 inch is 25.4mm) from where the stock outside wheel edge is. 10mm out for the offset of the centerline of the wheel and another 12.5~13mm for the increased wheel width ( 1 inch extra width divided by 2, inside and out side). The inside of the wheel will be almost 3mm more inboard of where the stock wheel is, +10 mm for off set then -12.5~13mm for the extra width. The 8.5" +48 offset wheel will only have its outside edge 7mm out from where the stock wheel is now. The difference in these two wheels will be about 16mm or about 5/8ths of an inch, the 9.5" wheel will stick out that much further than the 8.5" Either way, you should be fine running the stock tire size of 245/40-18 and not rubbing without fender mods.

If I understand wheels correctly, the offset is the amount the hub face on the wheel is offset from the centerline of the wheel. In other words, if you have an 8.5" +45mm wheel and a 9.5" +45mm wheel, their centerlines will still be in the same spot relative to the car. If you mount identical 255 width tires on both these rims, the center and edges of the tire will also be in the same spot relative to the car. Therefore, if we are concerned about whether a given wheel/tire combo will rub against the outside rear fender, we only care about the offset of the wheel and the section width of the tire. Now if we want to know if the inside edge of a given rim will rub against a shock body, then we want to look at the offset combined with the rim width. You are correct that the rim width affects where the outside edge of the rim is, but since the outside of the rim rarely rubs on anything, we don't care about that (unless you're going for the aggressive look). The one other way rim width could affect tire rub is if the rim is not ideally sized for that tire. For example, if you run 18" x 10" +35 mm rims and 245/40/18 tires, the sidewalls of the tire will be pulled out so far by the rim that they might rub the fender when the suspension is at full compression, almost as if wider tires were installed.

Frank