G37svert2013

Hello all, first post.

I have a 2013 g37 convertible sport. I would like to go from the 19" sport rims to 18" aftermarket. I am looking for recommendations and help. I want to go to the 18" in order to get higher sidewalls for a smoother ride, and do a square setup to make it easy to rotate the tires.

I am thinking 255/45/18 for the tire size, will that fit on the front ok? A custom wheel shop here recommended the Verde v27 saga, in hopes it would be the best chance to fit over my brakes. I'm concerned about this not sticking out far enough toward the fender because it is only an 8" rim. I really like the style though. What are your thoughts?


Thanks,
Dustin.

bPChaos

255/45 in the front will be fine. From what I understand, the convertible is similar to the coupe in terms of front track, so anything that will fit a coupe should fit the convert.

As for brake clearance, use these templates. Send them to your wheel shop and have them confirm.

https://www.myg37.com/forums/brakes-...templates.html

A 255 width tire typically likes something in the 18x9" range, so I'd start from there. I wouldn't go for an 8" wheel on a 255. It's possible, but I wouldn't. Offsets can range anywhere from +45 to +25, depending on how much sunken/flush/poke look you want.

G37svert2013

Wow! Thanks for the help. The mounting guidance for the tire spec sheets listed 8" as the minimum for that size so I thought it would work ok. I would definitely like to look for 9 or 9.5" 18's. Is there any way to tell whether they should fit over the brakes per the specs? Such as 9+ XX offset and 9.5 + XX offset, or is it impossible to tell without the physical wheel and template. For this design and brand they only have the 8" +38 in the 18 size.

blnewt

iTrader: (13)

I went from 20s down to 18s and glad I did Wheels are much lighter, tires are cheaper, and like you're wanting the taller sidewall makes the ride a bit easier on the tail.

There's quite a few 18s that clear the big sport brakes, most of the wheels from Japanese companies will clear your brakes.
Check Wedssport, Work Emotion line, SSR GTV line, Rays Gramlites, most of their 18x9.5s that have offsets of +38 or less will clear the calipers.
Check this link for many choices, and give Getyourwheels.com a call Jason Or Josh will take good care of you.
https://www.evasivemotorsports.com/m...ategory_Code=R

Here's a link to my 18" Wedsports that will clear your brakes, I'm running 245/285 stagger, but was running 245/45 square prior.
https://www.myg37.com/forums/18/2765...ml#post4135181

Keep in mind your rear setup in the vert is much wider than other Gs, so to run a square setup you will probably want spacers in back, or run more aggressive offset in the rear wheels to get the same fender fitment (which will actually end up being a staggered set since the offsets are different .

G37svert2013

I just spent an enormous amount of time trying to comprehend this. So if i bought 18x8.5 +35 for the front it would push the front edges out 7mm farther than stock, and 18x8.5 +15 for the back would push the back edges out 7mm farther than stock{pushing both out equally}. Then I could use the same size tire on all 4 rims, and rotate side to side easily. And Could rotate front to back by remounting tires.

blnewt

iTrader: (13)

If I get time tonight and can see what those wheels you like offer in specs and clearance. The big brakes are the hurdle, especially on an 8.5" width. If you go up to 9.5" width there are typically more options that will work. And if you aren't opposed to running different offsets in back that will be a better plan than spacers, just more work to do a true 4 tire rotation.
Looks like the Konig Integram is available in a 18x9 in a +27 and +35, you could run the +35s in front +27 in back and run 255/45 all around, should be a nice look and hopefully have brake clearance, but that's something you'd have to confirm w/ vendor. The Konigs would be a good choice vs. the others you listed, they are flow formed so they are stronger and lighter than regular cell cast wheels.

G37svert2013

Thanks so much for that! I would be willing to consider any width of 18" rims but I thought once I went over a certain size they would either stick out too far, or rub on the inside. Please let me know if you are able to locate any in that style type under $200.

My current situation is I have at least two of the 19" sport wheels which are warped enough to cause my car to vibrate around 45-55mph. I had to evacuate for the hurricane and I'd love to get these replaced before driving back across the country! Im worried about the vibration ruining a bearing or other parts.

Your time is really appreciated if you are able to get to it!

G37svert2013

Interesting news.... I called konig and they said they won't fit. However, they show up on the discount tire site when using the filters for 2013 g37 journey with brembo brakes option. Deception and Oversteer also show up as options. Is the journey with brembo different than convertible with brembo for brake clearance? Should I trust konig or try it anyhow?

blnewt

iTrader: (13)

You could ask the vendor what their return policy is, most will allow returns if there hasn't been a tire mounted on the wheel. If that is their policy you could give them a try.
You could also ask if the +27s will clear, and if so order them all around, the fronts would be close to flush and you would only need a smaller spacer to get the rears equal to the fronts at the fenders.

Might also look at used 18" OEM Z wheels, they clear the big brakes w/ a couple mm to spare.

G37svert2013

If I decide to go with 9.5" wide, would the best offset be 40mm for front and then spacer for back? That seems like and easy wheel/offset to find. Niche has several different wheels in that size and their website description says they are designed for large caliper clearance.

blnewt

iTrader: (13)

On a coupe & especially a vert you can run a bit less positive on the offsets but if you don't mind a more conservative (sunken-in) fit then the +40s will work. Here's another option, tirerack lists all their 18s that will clear the Akebono sport brakes for a sedan fitment here (so they will also clear your vert brakes), it lists the width, offset, and weight. If they have an 18 you like you might call them and see what additional offsets & widths they have, might be able to get something like a 18x9.5 +30. There's some nice deals here too~
https://www.tirerack.com/wheels/resu...oModClar=Sport
If you can up your budget just a bit those Enkei Tuning Raijin, TS-10, and RPF-1s are lightweight, and a quality Japan sourced product.

G37svert2013

I guess I'm confused, I thought if you had a 40mm offset it would be pulled in toward the car farther than 35mm offset. And since I was looking at 9"x35mm that 9.5"x40mm would be the closest setup for Keeping the outer rim lined up in the same location. Is my math wrong?

I. E. the 0.5"=12mm but split between inside and outside of the rim. So the 9.5" rim would stick out 6mm farther than the 9"rim. So using the 40mm offset on a 9.5" would give me the equivalent outer lineup of a 9" rim with 35mm offset.

So in my head I was thinking the best setups would be 9.5x40, 9x35, 8.5x30, and 8x25 in order to have the outside of the rim line up equally for different rim widths. Are you saying a better list of options for me would be 9.5x35, 9x30,8.5x25, 8x20? Or am I missing the boat altogether?

Thanks again. I think I'm about to pull the trigger on two just to test on the front. I'll never know until I get something in hand.

G37svert2013

Bout to just buy 3 more spares hahaha.

blnewt

iTrader: (13)

Your grasp of the wheels calculations is correct
It's typical to go a bit more aggressive, or closer to the fenders when going w/ new wheel setups as the factory offsets/fit is pretty conservative.

If you are happy w/ the factory fit and don't want to deviate much from that, then those offsets you listed will be similar, and the second set would be a small step further out, but 5mm isn't much, I think both plans would be fine, as long as you don't mind running that spacer in back to bring that out some, probably in the 20-25mm range, but you can add those easily later, so get the set then decide how much spacing you'd like. And like I mentioned, ALL those wheels on that tirerack link will clear your brakes, so at least you know there's a good amount that will

G37svert2013

It took a lot of time to find wheels and tires that seem like they will work for me, and meet my goals. Here is what I decided on. Deliveries will arrive next week and I will post pics if they fit!

I decided to go with the Miro type 111 8.5" with 35mm offset. I also purchased 5mm spacers in case they are needed for the front. I'm hoping these will fit. I purchased 20mm spacers for the rear. I also purchased a toe/camber kit because my alignment was at max adjustment and couldn't be properly aligned causing wear on the inside.

I purchased the Yokohama Advan Sport A/S in 245/50/18 for all 4.