why 18'' wheels more popular on track?

synolimit · 01-29-2014, 07:55 AM

Quote:

Originally Posted by Masterbeatty

Check out A.M. Brian's offer. That is what he is trying to do is make them affordable. That's why I am waiting to see what happens with those. Races don't start in CT till end of March anyway so I have some time.

Not sure I follow. He's making a tire or something? Is there a post?

wstar · 01-29-2014, 10:11 AM

The thread is here: New/Better Wheel Option for Spec Z . He's making an 18x10 square set for the SpecZ crowd, and the offsets look good for us too on paper.

FWIW, my current square setup (that works and doesn't rub, with the APRacing BBK and the car lowered an inch or two on my coilovers) is Forgestar F-14 18x10 +34 all around, and using a 10mm spacer (the type that's just a plate with holes in it, from Z1) in the rear so they come out a little closer to the fender back there, with 275/35R18 rubber on them (RS3). I got the offset info from travisjb + Mike who have both run a similar setup at some point in the past. The upside of same-offset all around on the wheels themselves is you can rotate wheels between all 4 corners and flip tires on the wheels, etc. Less waste on un-rotate-able tires.

As I mentioned in Brian's thread, I think the offsets he's putting on his SpecZ setup will end up ~5mm further out than mine, so it's in the ballpark and will work, although who knows yet on brake fitment and whether you'd want a little spacer in the rear for looks.

synolimit · 01-29-2014, 10:18 AM

O I only care about tires. At the moment it looks like 285/35 RS3 or 295/30 R888.

I plan on rpf1 in 18x10 +38. Right now I have 18x9.5 +45 (w/ 20mm) and 18x10.5 +15. To me they stick out a little to much. Maybe 1/4" past the fenders. The new rpf1's will suck in 7mm front and 9mm rear by me moving the 20mm spacer from the front to the rear.

Not 100% if the front will fit, if it doesn't then a 5mm spacer should do it I hope.

cossie1600 · 01-29-2014, 01:22 PM

285 35 18 is too small, it's annoying to rub everywhere

wstar · 01-29-2014, 03:16 PM

I think you mean too big? But yeah, after seeing how 275/35R18 fits in the front, I can't imagine trying to go any bigger up there. The rears can fit whatever you'd like within reason. Keep in mind it's not just the fender and wheel well, but also not rubbing holes in your front brake ducts.

Masterbeatty · 01-29-2014, 03:35 PM

Damn never thought of that. I would think that the ducts would clear since they move with the hub.

cossie1600 · 01-29-2014, 04:19 PM

Oops sorry misread 285 30, ignore what I said

wstar · 01-29-2014, 05:33 PM

Quote:

Originally Posted by Masterbeatty

Damn never thought of that. I would think that the ducts would clear since they move with the hub.

The part that attaches to the hub moves with the hub, but generally the routing of it from there to the front of the bumper involves at least some travel along the engine-bay side of the wheel well. Mine ended up pressed against there and slightly flatted and zip-tied down, but I still hit them a little at full steering lock. Not enough to rub holes in them yet over several months, but it's a consideration.

Mike · 01-29-2014, 07:10 PM

I run 295/40-18s, but I'm at -3 degrees camber too and they just barely clear everything. Car looks like a character from the "Cars" cartoon movies!

synolimit · 01-30-2014, 08:41 AM

Quote:

Originally Posted by Mike

I run 295/40-18s, but I'm at -3 degrees camber too and they just barely clear everything. Car looks like a character from the "Cars" cartoon movies!

Well I'm good then.

01-29-2014, 10:11 AM	#62 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	The thread is here: New/Better Wheel Option for Spec Z . He's making an 18x10 square set for the SpecZ crowd, and the offsets look good for us too on paper. FWIW, my current square setup (that works and doesn't rub, with the APRacing BBK and the car lowered an inch or two on my coilovers) is Forgestar F-14 18x10 +34 all around, and using a 10mm spacer (the type that's just a plate with holes in it, from Z1) in the rear so they come out a little closer to the fender back there, with 275/35R18 rubber on them (RS3). I got the offset info from travisjb + Mike who have both run a similar setup at some point in the past. The upside of same-offset all around on the wheels themselves is you can rotate wheels between all 4 corners and flip tires on the wheels, etc. Less waste on un-rotate-able tires. As I mentioned in Brian's thread, I think the offsets he's putting on his SpecZ setup will end up ~5mm further out than mine, so it's in the ballpark and will work, although who knows yet on brake fitment and whether you'd want a little spacer in the rear for looks. __________________ 7AT Track Car! Journal thread / Car setup details

01-29-2014, 10:18 AM	#63 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3389	O I only care about tires. At the moment it looks like 285/35 RS3 or 295/30 R888. I plan on rpf1 in 18x10 +38. Right now I have 18x9.5 +45 (w/ 20mm) and 18x10.5 +15. To me they stick out a little to much. Maybe 1/4" past the fenders. The new rpf1's will suck in 7mm front and 9mm rear by me moving the 20mm spacer from the front to the rear. Not 100% if the front will fit, if it doesn't then a 5mm spacer should do it I hope. __________________ 13 370z- Last edited by synolimit; 01-29-2014 at 10:21 AM.

01-29-2014, 03:16 PM	#65 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I think you mean too big? But yeah, after seeing how 275/35R18 fits in the front, I can't imagine trying to go any bigger up there. The rears can fit whatever you'd like within reason. Keep in mind it's not just the fender and wheel well, but also not rubbing holes in your front brake ducts. __________________ 7AT Track Car! Journal thread / Car setup details

01-29-2014, 03:35 PM	#66 (permalink)
Masterbeatty A True Z Fanatic Join Date: May 2012 Location: Whales Vagina Posts: 4,586 Drives: the speed limit... Rep Power: 122867	Damn never thought of that. I would think that the ducts would clear since they move with the hub. __________________ 2011 MB 6MT Masterbeatty journal

01-29-2014, 07:10 PM	#69 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	I run 295/40-18s, but I'm at -3 degrees camber too and they just barely clear everything. Car looks like a character from the "Cars" cartoon movies! __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

01-29-2014, 01:22 PM	#64 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	285 35 18 is too small, it's annoying to rub everywhere

01-29-2014, 04:19 PM	#67 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	Oops sorry misread 285 30, ignore what I said

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