18/19 Advance Front Fenders / Marga Hills Rear Fenders Fitment

[NSX-GT]

Wheel gurus help me out please.

Ordering the Advance Front Fenders (+25mm each side) with the Marga Hills rear fenders (+30mm each side) for my NSX, I browsed for hours with search and didn't find any existing listed wheel setups with these jdm fenders. 18/19 is not popular combo here in Asia. Shinbori-san of Advance has told me his own NSX with the same fender setups is on 18x9J +38 front, and 18x10.5J +15. However Advance and Marga Hills are not willing to recommend me tire/wheel sizes due to liabilities I suppose.

The biggest wheel disti here in Hong Kong recommends me to go with 18x8J +16 (Their specialist say 18x9J will affect speedo too much?) and 19x11J +17 (I had hoped to fit 18x9/19x11.5). With 225/40/18, and 295/30/19 Tire setup.

I need confirmation from you experts out there that this will fit and won't effect drivability/TCS issues! Thank you very much in advance.

 

[kennyvb]

Can you spec your wheels however you want?

The tires you can buy will dictate the optimum size of the wheel. If you a 11.5" rear, I'd recommend something along the lines of the Michelin Pilot Super Sport in the 295/30R19 size paired with a 225/35R18 on a 8.5" front. A reasonably conservative widebody offset for the 8.5" front would be ET20-25 and ET30-35 for the 11.5" rear.

 

[stuntman]

Lots of info:

- Under stock fenders, a FRONT 18x8 +38 or 18x8.5 +44 sit pretty flush and don't require an extreme amount of camber to 'tuck' the tire. There's probably 2mm worth of additional clearance for these setups.

Shinbori-san's FRONT 18x9 +38 sticks out 13mm wider than the above 'safe' factory setup. If the front fenders truly are +25mm wider (often the stated width increase isn't correct) then his tires are inset 12mm. Keep in mind OEM NSX wheels are ~30mm inset from being flush.

The HK wheel distributor's 18x9J +38 front recommendation would stick out 22mm wider than the above stock recommendation, which 'should' fit under the advertised 25mm wider fender.


- Under stock fenders, a REAR 19x9.5 +34 or 19x10 +40 sit pretty flush and don't require an extreme amount of camber to 'tuck' the tire. There's probably 5mm worth of additional clearance for these setups.

Shinbori-san's REAR 18x10.5 +15 sticks out 32mm wider than the above 'safe' factory setup. Without knowing, I would guess he is running a stretched tire with an excessive amount of rear camber.

The HK wheel distributor's 19x11J +17 rear recommendation would stick out 36mm wider than the above stock recommendation, which would probably require an unnecessary amount of camber to fit under the advertised 30mm wider fender.


*Wheel width has NO effect on traction control. The Outer Diameter of the tire is what does.


The front is a bit tricky because as you go wider, the tire swings in a larger arc and will interfere with the rear of the chassis sooner. It may require hammering the tab on the chassis behind the front tire as well as hammering the tub itself a bit for clearance at full lock. As far as what would fit under the lip of the front and rear fender, that is easier to guess on what will work.

Are you stuck on the 225/40/18 front tire size? Have you decided on what tire you want to run?

This is a MUST-READ for anyone who is looking to go down the path of properly sizing wheels and tires:

http://www.motoiq.com/MagazineArtic...LY-select-and-size-TIRES-for-PERFORMANCE.aspx


Without knowing what tire you want to run, it's hard to say, but if you want to stick with a 225 width tire, a 8.5" wheel might be a better choice than a 9" front.


As far as TCS is concerned:

A 225/40-18 will work best with a 285/35-19 rear tire. It will probably still be fine (but not quite within the factory tolerances) with a 295/35-19, which is slightly better than a 295/30-19
, and 295/30/19 Tire setup.

A 225/35-18 will work great with a 295/30-19 or 285/30-19, and will be okay with a 305/30-19


I really like the Michelin Pilot Super Sport tire and they have a 225/35-18 with a 295/30-19 and 305/30-19 rear. Read the linked article because you need to be careful. There are TWO 295/30-19 Michelin PSS tires, one that has a 10.7" Treadwidth and the other with a 11.5" treadwidith. These tires will require a 11" wheel and 12" wheel respectively. *The 10.7" treadwidth tire could also use a 11.5" wheel but will have a slight stretch.

0.02

 

[white98sh]

I have a similar fender setup, Downforce GTS +25mm fronts and Taitec +30 rears. I am running 17x9 +40 on 245/40 and 18x10.5 +25 on 285/35 Hankook RS-3s.

There is very slight rubbing at the front chassis seam under certain situations at full lock. Otherwise the combo fits great and the extra front grip is immediately noticeable.

Sent from my iPhone using Tapatalk

 

[NSX-GT]

Thank you all for the wealth of information! I've decided to go with the following specs based on your advices.

18x8.5J +24, 225/35/18
and
19x11J +29 295/30/19

running Michelin PSS based on all the good reviews and Billy's reccomendation.

 

[NSX-GT]

Hi all, small update. Seems like over here in Asia they are unable to get the 295/30-19 Michelin PSS tires, one that has a 10.7" Treadwidth (US origin), and only able to get the ones from France. So unfortunately that means I have to step up? to a 11.5J wheel to fit the 295/30/19 11.5'' Tread PSS's.

I'm looking at this now;

18x8.5J +24, 225/35/18
and
19x11.5J +36 295/30/19

 

[pinkhairman]

I have the exact same fender set up as you (great choices!), and from my experience and research, Im fairly confident that 11.5s will be slightly too wide. A 10.5 +22 wheel with a 265 tire already shows some poke, and assuming you get the offset set up so that the inner lip of the wheel is as far towards the centre of the car as you can without rubbing or hitting anything, the wheel will still end up extending a decent amount outside of the edge of the fender. Based on my findings, the ideal offset for 11.5s is about +(30-34), meaning that the outside of the wheel would extent 3mm past the outside of the 10.5 +22 set up, but with an additional 15mm of tire per side. 11s are doable, but 11.5s seem, based on what I know, to be asking for a little too much. I'm also confused about the issue. You say you cannot get the 295/30-19 Michelin PSS, but then go on to say that you'll need to get an 11.5 inch to run a 295/30-19 tire. Please clarify or correct me if I'm missing something. A final thing to add is that you can always just run a more narrow wheel with a more narrow tire. Unless you're making 400+WHP, a 265 PSS should be more than adequate and also provide a significant decrease in unsprung weight, thus increasing acceleration. Right now, I have an 18x10 +20 wheel with a 265 tire and am very happy with the fitment. The tires sit nearly flush with the fenders and have no rubbing whatsoever. It's also worth noting that my car is making 345 RWHP and I have no problems with traction.

 

[pinkhairman]

Reference picture showing the poke of a 10.5 +22 wheel with 265 tires on an Advance customer car (photo from Speedhunters)

the fitment of my car, with some room to spare (10+20, 265s)

 

[stuntman]

10 +40 fits pretty flush on a stock fender.
10.5 +22 (Advance Customer) - extends 24mm wider than the above stock fender, flush fitment.
10 +20 (pinkhairman) - extends 20mm wider than the stock flush fitment.

Pinkhairman - how much rear camber are you running? Any other pics of your setup?

I have the exact same fender set up as you (great choices!), and from my experience and research, Im fairly confident that 11.5s will be slightly too wide. A 10.5 +22 wheel with a 265 tire already shows some poke, and assuming you get the offset set up so that the inner lip of the wheel is as far towards the centre of the car as you can without rubbing or hitting anything, the wheel will still end up extending a decent amount outside of the edge of the fender. Based on my findings, the ideal offset for 11.5s is about +(30-34), meaning that the outside of the wheel would extent 3mm past the outside of the 10.5 +22 set up, but with an additional 15mm of tire per side. 11s are doable, but 11.5s seem, based on what I know, to be asking for a little too much.

11.5 +39 would match pinkhairman's outer offset but would sit 17mm further inward than stock. There's a lot of room there but i'm not sure how much off the top of my head. I have a lot of confidence in 11 +29 fitting with no problems

I'm also confused about the issue. You say you cannot get the 295/30-19 Michelin PSS, but then go on to say that you'll need to get an 11.5 inch to run a 295/30-19 tire. Please clarify or correct me if I'm missing something. A final thing to add is that you can always just run a more narrow wheel with a more narrow tire. Unless you're making 400+WHP, a 265 PSS should be more than adequate and also provide a significant decrease in unsprung weight, thus increasing acceleration. Right now, I have an 18x10 +20 wheel with a 265 tire and am very happy with the fitment. The tires sit nearly flush with the fenders and have no rubbing whatsoever. It's also worth noting that my car is making 345 RWHP and I have no problems with traction.

Read Post #3

Michelin offers two versions of 295/30-19 that vary greatly in size and width.

275/30-19 - 10.9" section width, 10.2" tread width
295/30-19 - 11.8" section width, 10.7" tread width
295/30-19 - 11.9" section width, 11.5" tread width

By going to a 275/30-19, you're giving up 0.5" of tread width but there's a lot of confidence with a 19x11 +29 clearing with no problems, and it's a lighter setup. The 10.7" 295 would be nice to say that you have a 295, and have a little more rubber, but the 11.5" would be tough to stuff in there and you might find that it does not fit and would be out the $ of the wheels and tires. You're paving new ground by going that route. you could use the 11.5" tire on a 11" wheel, but it will bulge and affect your handling and not necessarilly have more grip than the 275/30-19. Ideally a 11.5 or 12" wheel would be best for that tire.

Are you sure you can't special-order the 10.7" 295? How much power does your car make and what is the goal for you? (looks, widest tire possible, handling, drag racing, good handling, etc...)?

 

[pinkhairman]

Thanks for the clarification about the PSS stuntman - I did not know that. Unfortunately, I don't have any pictures that really show off my wheel fitment, and don't have access to my car at the moment (being injected with some more power!). I'm also going to assume my camber is stock, But I wasn't the one who installed my suspension, so I can't say for sure. who installAs far as the room on the inside of the wheel well goes, I used the TE37 from Science of Speed as a reference , as it sits further inside of the wheel well than any of the other wheels they sell. Honestly, the best advice I can give is to have the fenders installed and then measure your clearances, as it's the only way that you're going to be guaranteed proper fitment.

 

[scammy]

I have the Advance front fenders my wheels specs are the Advan RG3 @8.5 x 31 they are in a 17 size but have been contemplating going 18 all round and running a 245 PScup2
I currently have the Nitto 235 up front on 17's and have zero issues with rubbing and about 2.5 degrees neg camber up front.
the trouble with what I'm thinking is the PS cup2 only comes in a 265 rear in 18's so not sure how a 245 front with a 265 rear will be, this setup is aimed at track work and I don't want a 19 rear because of NA power
I think the sizes are;
Front 245/40/18,TW 8.3, 22lbs, Overall dia 24.7"? Rear 265/35ZR18,TW 10.8, 26lbs, Overall dia 25 or 285-295/30/18

 

[stuntman]

A 225, 235, or 245/40-18 will not work with a 265/35-18 from a TC and brake bias standpoint. I'd either choose a different tire or go with a 275/35-19 rear.

 

[scammy]

A 225, 235, or 245/40-18 will not work with a 265/35-18 from a TC and brake bias standpoint. I'd either choose a different tire or go with a 275/35-19 rear.

yep I hear you I don't have the TCS anymore as I run an aftermarket ECU, I wish that tire came in a 275 but it doesn't in a 18

 

[pinkhairman]

The thing to watch for with 245s up front is rubbing with the chassis. Right now, I'm running a 245 PSS up front with super aggressive offset, and have some slight rubbing between the outside edge of the tire and the inside front most corner of the wheel well at full lock.

 

[scammy]

The thing to watch for with 245s up front is rubbing with the chassis. Right now, I'm running a 245 PSS up front with super aggressive camber, and have some slight rubbing between the outside edge of the tire and the inside front most corner of the wheel well at full lock.

I had that with the 235 Nitto's with my 17x8x38 but when I got the Advance fenders and decided to get the 17x8.5x31 the wheel ended up about 15mm further out so no more rubbing with those Nitto's and better brake calliper clearance and filled out those new fenders better however 18" fronts would fit that fender better

 

[pinkhairman]

Scammy, was the rubbing on the inside edge or outside edge of the tire? If the outside edge of the tire was rubbing with the chassis at full lock, pushing the wheel further out should only serve to worsen the problem. I also realized I typed camber instead of offset, my mistake! I think I have a 18x8.5 +31 wheel with a 20mm spacer up front right now, which I believe pushes the tire too far outward thus causing the rubbing.

 

[scammy]

rubbing was inside due to wheel not being far enough out and by going to the 8.5x31 that solved the issue and that meant I had to get the wider fender but I also wanted the vent for the hot air to escape as I also installed brake ducting from the front of the car to the rotor.
it got me 15mm more track per side and more brake calliper clearance so a win all round, if I had a spacer as well I think it would rub the fender

 

[pinkhairman]

Ah, I understand now scammy, thanks for the clarification! The rubbing I was referring to was that between the outside edge of the tire and the chassis of the car opposite the edge of the fender, as in the inmost section of the wheel well. With the Advance front fenders, you'll run out of room with the chassis before you'll run out of fender. Makes me seriously consider tubbing or tube framing the front of my NSX... :biggrin:

 

[NSX-GT]

Reference picture showing the poke of a 10.5 +22 wheel with 265 tires on an Advance customer car (photo from Speedhunters)

Shinbori-san's REAR 18x10.5 +15 sticks out 32mm wider than the above 'safe' factory setup. Without knowing, I would guess he is running a stretched tire with an excessive amount of rear camber.

Yeah this is confusing as hell to me. I just took a look at the latest hyperREV and it lists Shinbori-san's NSX at 18x10.5J +12 ... and with 295/35-18 A050 tires... Just as he told me via email, the similar? (3mm+/-) specs.

Yet the picture of his NSX does not look that aggressive/negative cambered even compared to his customer's Blue NSX.

Anyhow, I'm still kind of stuck at my choices now. stuntman I know you have advised me to go for the 19x10.5J with 275/30-19s now, but the shop here is demanding that I don't as they say it will be superstretched, and I should still go for the 295 PSS. I also am wanting a rear wheel wider than 10.5J... as I suppose I hope to make the best out of my widened fenders, even stock bodied NSXs seem to be able to do 10.5J... Also they have no specs for the PSS so I'm not sure it's the 10.7 treadwidth or the 11.5 treadwidth one, as the only 'specs' they can provide is the description which is "295/30R19 MICHELIN SUPER SPORT P. XL 100Y (EU)" which i can only assume is the FR one from Tirerack. Their tire guy insists on me getting this even I have a 10.5J wheel as opposed to the 275.

BTW, pinkhairman. Your car looks super hot.

 

[kennyvb]

It's already been confirmed that you can fit a 8.5" front and 10.5" with appropriately sized tires on an OEM body so it'd be a shame not to go wider (after all, that's the whole point, right?)

Unless you can get the specs directly from the horse's mouth, I'd be cautious about determining fitment from a few pics and quoted specs e.g. I wouldn't rule-out spacers on the blue Advance car. The supposed specs and fitment just don't add-up.

I still like my recommendations but if you want to eliminate most of the guess-work to fit the widest combo with little-to-no rubbing, I'd say get your fenders set and dial-in your ride height and alignment with your current wheels and take measurements as someone previously mentioned.

 

[stuntman]

The 275/30-19 has a 10.9" section width and 10.2" tread width. I'm not sure why your shop thinks that's going to be "super stretched" on a 10.5" wheel. It's not and will be the perfect fitment for the tire.

My Mustang racecar has a 10" treadwidth and a 10.5" wheel width and it fits nice and proper and would hardly be called stretched, let alone "superstretched"

For the 295/30-19, there is a 100Y XL and a 100Y XL TPC Spec (which is what you want with a 11" wheel.

It really does not sound like your shop knows what they are doing. I would go elsewhere to get the correct tire. The 275 will be the most conservative and likely to clear your setup no problem and will be more than enough tire for your needs and power. If you want to gamble on getting the wrong tire and the possibility of it not fitting, good luck with going with the 295.