Need help with tire fitment on 20x10.5 for front!
 

I'm currently on CV3s with an H&R spring drop,

20x9 +25 up front w 245/35 tire and 5mm spacer
20x10.5 +15 on rear w 285/30 tire and 20mm spacer

I'm going to be ordering (2) 20x10.5 +15 for the front and will be dropping ride height even further on BC coil overs... What sized tire can I use on these front wheels? At current ride height it doesnt seem 275 would fit up front but with lower ride height and some more negative camber would it?

Thanks!

Whats your end goal?

We have seen japanese tuners do the 10.5 but their lowest offset was a +22 and a 265 tire...

Since your going with a full square setup here is what your looking at.

Your new fronts will sit approximately 28mm+ out from your current front wheel setup... typically, people run a 9.5 +15 with a 255 front. A 255 or 265 would be my starting point and this is going to depend on tire brand as well...

Want to be low and wide, mild poke, car is a daily driver so i dont want to stretch aggressively, tho a bit is acceptable. Maybe a +25 offset on 10.5 would be more realistic. I have the 20x9 +20 im front now but its practically a flat wheel with no concave, I want a deeper concave on front. I'm going to test fit my 20x10.5 +15 on the front get a better idea. I've researched tire sizes, doesn't seem 265 is a very common size however 255 is readily available.

There is a Z that claims to have the 10.5 all around with +15 offset but it can't be confirmed, the fact that he can't remember his tire sizes makes me a bit hesitant in believing.

This car is 20x10.5 all around and claims +15 all around. Vossen couldn't confirm and said it could possibly be +25 on front. Vossens square looking setup on the G37 is +25 on front +15 on rear, I kno our front fenders are rider so wasn't sure if that'd make a diff

That's square but definitely not same offsets all the way around. You can easily tell from the difference in concave between front and rear. I want to run the TC-105n's in a square set up at 18x10.5 +12 but it would definitely require fender work as running track wheels with extreme camber is kind of counter productive....

I've looked at various angles of this car, some angles look square some look slightly off.

There's one guy I know that pulled off 18x10.5 +15 all the way around but he rolled his fenders like CRAZY. Not sure if Corbin still lurks on the forums as he has sold his Z.

10.5 +25 is safe for daily and u can run 265 on it I believe...

I used to run 18x10 +15 255/40 all around with a 30mm spacer in the rear if that matters. Lowered on KWV3. -2 degrees of camber in the front. Rolled fenders/trimmed fender tabs and liner. No rubbing.

20x10.5 +25 is an aggressive fit for the front on the 370Z. I myself have a G37s Coupe and I am currently running 20x10.5 +15 up front with 255/30/20 and -3.6 camber, slammed to. On the Z yes you have more room to play with but even a +25 you are looking at 255/265 and possibly running negative camber and rolling fenders. It can be done, but certainly not recommended by us. I also ran a +25 before with a Falken 275/30/20 and also had a 265/30 +25 with -1.4 camber which was a better fit for a DD.

If i had a 370z I would probably attempt the +25 with 265/30 and slight negative camber, but again it's not recommended unless the customer is willing to "make it work"

^^^ my point exactly :tup:

Makes plenty of sense. Def going to be slammed and I expect negative camber. 265 doesn't seem as available as 275 or 255. The 275 fit up front okay with negative camber and drop? I'm fearful a 255 will expose wheel to road wear, I had a 275 on rear and the gunmetal finish on the lip took a beating from road debris. If anything, trimming or removing the fender liner seems a necessity if I go any lower...

275 would require major trimming and camber!

Okay so guess my question is... What's the best way to fit a deeper concave wheel on front?
20x10.5 +25 offset with 265 or 255 tire. Diego is there a 20x9 offered with a better offset for more concave goodness?

Thanks for the input guys!

I'm still learning the variations of offsets, just when I think I've got it all figured out I learn more, the change from 9 width to 10.5 and the offset change eith the width chsnge is still confusing me

Funny I found this thread as I was just on the phone with vossen today asking the same questions about the same wheels and the same 10.5 all around and how did u make this work. This is going to be the set of wheels I'm gonna roll on while I figure out what custom wheels to roll on while the wife cools down after all the cash I dropped on the Z at GTM. Good luck on your quest bro, as I am not rolling any fenders or modifying the body to fit these wheels that agressive. If looks sweet thou, but that's what custom wheels are made for with more options in rim size and offsets. Let us know how it turns out

with 1 piece forged wheels and deep concave you will need a wider rim for structural integrity (simple terms)... You might want to follow the setup they went with on the 265... yes there are less tire options but it will meet your goal...

Since your going with a complete rectangle installation here is what your looking at. Your new methodologies will sit roughly 28mm+ out from your present front side rim installation... generally, individuals run a 9.5 +15 with a 255 front side. A 255 or 265 would be my kick off factor and this is going to rely on rim product as well.... . .

Couple guys who have 10.5 up front said their running 225 up front w obvious stretch. Is this necessary?! I'm running a 245 up front now on a 9 wheel, could I at the very least get away with a 245 on 10.5 if a stretch is necessary?

Car looks amazing but I wouldnt say that is "hardly" stretched lol.

Looks awesome Diego thanks! I'm going for the 25 offset, that's plenty more concave and it doesn't require to much messin around.