Dodge should have done 18" front wheels...

[SharpMan]

Is it just me or does it seem that Dodge should have gone with an 18" front wheel? If Finnspeed and others can make a suitably strong wheel at that diameter than it probably should have been apparent to Dodge in their development.

Don't get me wrong..I think the level of track-oriented engineering of the ACR is unprecedented but it seems that an 18" wheel would have not only provided more tire options but better wear characteristics or am I off base?

[donk_316]

Something to do with clearing the CCBs?

[bluesrt]

I think the whole set up was to peak out the factory times they did, wheel and tire pakage for merchant purposes .as far as the best trac wheel package, woodhouse has it nailed on that

[VENOM V]

Let's see how the 18/19" wheels that clear the CCBs work out for folks before drawing conclusions. There's only something like 2mm clearance between the 18" Forgelines and the CCB calipers. That leaves nothing for small rocks to travel through, and I wonder if deflection during hard contact with curbing Etc. could be a problem. But if after a couple months people aren't having issues, I may spring for them.

[Nambo]

I do have grooves cut in the barrel of the 18" wheel where rubber and debris caught between the caliper and the wheel. It is not very deep and is just a little more pronounced than pictures posted earlier of the same markings on the 19" front wheels.

[One Viper Bite]

I think the main factor was fitting the 6 piston calipers for the CCBs along with cooling.

As far as I am aware, none of the factory 18 inch wheels for the Gen V can accommodate the 6 pistons up front.

[Junkie]

Whats wrong with 19's? R7's go on and people have been going fast on that tire.

[Nambo]

Whats wrong with 19's? R7's go on and people have been going fast on that tire.

To me, the car feels more balanced with a wider front tire (315). To got that wide on a 19" rim you will need to trim the fender wells and even then you risk damaging the hood in an off track episode especially if you are near lock with the wheel. I would hate to have to replace the hood.

[Voice of Reason]

To me, the car feels more balanced with a wider front tire (315). To got that wide on a 19" rim you will need to trim the fender wells and even then you risk damaging the hood in an off track episode especially if you are near lock with the wheel. I would hate to have to replace the hood.

Why would a 19" wheel differ from a 18"? The overall tire diameter is the same between both, the 19s are lower profile. So if you're risking damage with a 315 on a 18" wheel the same should apply on a 19".

[VENOM V]

I do have grooves cut in the barrel of the 18" wheel where rubber and debris caught between the caliper and the wheel. It is not very deep and is just a little more pronounced than pictures posted earlier of the same markings on the 19" front wheels.

Yes this is my main concern. Please keep us posted if the grooves become of concern. Very interested in going this route. Thinking about pulling the trigger on some Forgelines right now. What tires are you running?

[kverges]

Why would a 19" wheel differ from a 18"? The overall tire diameter is the same between both, the 19s are lower profile. So if you're risking damage with a 315 on a 18" wheel the same should apply on a 19".

Overall a 315/30-19 is about .7" greater diameter than 315/30-18. The stock 295/25-19 is a very small tire at about 24.8" and a real challenge to match in diameter.

Incidentally, has anyone tried to go crazy with a R7 335/30-18 in front? It's 25.6" diameter, same as 315/30-18

[VENOM V]

Why would a 19" wheel differ from a 18"? The overall tire diameter is the same between both, the 19s are lower profile. So if you're risking damage with a 315 on a 18" wheel the same should apply on a 19".

The 19s are not lower profile, at least for slicks.

19" front Kumho: 24.5" high
18" front Hoosier 295/30-18: 25.3" high. This would work
18" front Hoosier 315/30-18: 25.6" high. Ran these on my GTS, they worked well. But it's an inch taller than stock.
19" front Hoosier 295/30-19: 26.1" high. I've been told they do rub. Risk of damage as Nambo points out. Plus, hard to get the rake.
19" front Hoosier 315/30-19: 26.1" high, but REALLY wide. More risk of damage.

I also have a problem at my local tracks- I'm at redline at the end of the main straight in 4th at tracks near me. 5th gear shift loses too much speed and time. So I don't like that the rear Hoosiers (26.8" high) are shorter than the stock Kumhos (~27.4" high), which would require a 5th gear shift at Thunderhill and probably Laguna Seca.

I'm likely going with Pirelli DH slicks on Forgeline 1-piece wheels:
305/645-18 front, 25.4" high
325/705-19 rear, 27.75" high

Kumhos 24.5 f / 27.4 r
Pirelli Slicks 25.4 f / 27.75 r

[SharpMan]

I do have grooves cut in the barrel of the 18" wheel where rubber and debris caught between the caliper and the wheel. It is not very deep and is just a little more pronounced than pictures posted earlier of the same markings on the 19" front wheels.

Whats wrong with 19's? R7's go on and people have been going fast on that tire.

Why would a 19" wheel differ from a 18"? The overall tire diameter is the same between both, the 19s are lower profile. So if you're risking damage with a 315 on a 18" wheel the same should apply on a 19".

The 19s are not lower profile, at least for slicks.

19" front Kumho: 24.5" high
18" front Hoosier 295/30-18: 25.3" high. This would work
18" front Hoosier 315/30-18: 25.6" high. Ran these on my GTS, they worked well. But it's an inch taller than stock.
19" front Hoosier 295/30-19: 26.1" high. I've been told they do rub. Risk of damage as Nambo points out. Plus, hard to get the rake.
19" front Hoosier 315/30-19: 26.1" high, but REALLY wide. More risk of damage.

I also have a problem at my local tracks- I'm at redline at the end of the main straight in 4th at tracks near me. 5th gear shift loses too much speed and time. So I don't like that the rear Hoosiers (26.8" high) are shorter than the stock Kumhos (~27.4" high), which would require a 5th gear shift at Thunderhill and probably Laguna Seca.

I'm likely going with Pirelli DH slicks on Forgeline 1-piece wheels:
305/645-18 front, 25.4" high
325/705-19 rear, 27.75" high

Kumhos 24.5 f / 27.4 r
Pirelli Slicks 25.4 f / 27.75 r

Great info. Thanks.

I was also thinking that a set of 18s would present some better street tire options and typically I like both the feel and look of a taller sidewall better as well.

[Arizona Vipers]

I'm planning on ordering 18" fronts for my ACR as well for the track. No way am I running the front Kumho's from everything I've read. I simply cannot afford to replace my fronts every few sessions. My only concern is as others have said, debris causing damage with the extremely tight tolerances. Who out there has a lot of track miles on 18"' front wheels/CCB's??

[jpgunn123]

The 19s are not lower profile, at least for slicks.

19" front Kumho: 24.5" high
18" front Hoosier 295/30-18: 25.3" high. This would work
18" front Hoosier 315/30-18: 25.6" high. Ran these on my GTS, they worked well. But it's an inch taller than stock.
19" front Hoosier 295/30-19: 26.1" high. I've been told they do rub. Risk of damage as Nambo points out. Plus, hard to get the rake.
19" front Hoosier 315/30-19: 26.1" high, but REALLY wide. More risk of damage.

I also have a problem at my local tracks- I'm at redline at the end of the main straight in 4th at tracks near me. 5th gear shift loses too much speed and time. So I don't like that the rear Hoosiers (26.8" high) are shorter than the stock Kumhos (~27.4" high), which would require a 5th gear shift at Thunderhill and probably Laguna Seca.

I'm likely going with Pirelli DH slicks on Forgeline 1-piece wheels:
305/645-18 front, 25.4" high
325/705-19 rear, 27.75" high

Kumhos 24.5 f / 27.4 r
Pirelli Slicks 25.4 f / 27.75 r

The 285/30/18 Hoosier is 24.8" tall and is wider than the 295/30/18, so I would run the 285 or the 315/30/18 in the front.

[Nambo]

Yes this is my main concern. Please keep us posted if the grooves become of concern. Very interested in going this route. Thinking about pulling the trigger on some Forgelines right now. What tires are you running?

Right now I am running Michelin slicks. Front tire wear was not much better than the Kumho's though. Michelin made a change in construction for their 2016 slicks which they say require a different setup than in the past. Working with them to find out what setup changes I might need. Will move on to the Pirelli slicks if I can't get the Michelins to last longer. Am definitely going to take a notch of rear wing out for the next track day to see if that helps the balance. Rear stays planted and the front tends to push. Safer that way but hell on tires.

[VENOM V]

Right now I am running Michelin slicks. Front tire wear was not much better than the Kumho's though. Michelin made a change in construction for their 2016 slicks which they say require a different setup than in the past. Working with them to find out what setup changes I might need. Will move on to the Pirelli slicks if I can't get the Michelins to last longer. Am definitely going to take a notch of rear wing out for the next track day to see if that helps the balance. Rear stays planted and the front tends to push. Safer that way but hell on tires.

Even with the wing in position 1 it's surprisingly safe. So easy to drive through any issue without drama. This ACR is bad ass, plain and simple.

Luke is getting good life out of the Pirelli fronts, and he's faster on them than the Kumhos, no need to cool them off midsession. The Pirellis seem to be the ticket.

[Junkie]

Man its looking like 18/19 on Pirelli may be the ticket than, upsetting. I was really hoping I could use Hoosiers on my factory wheels without issue and then buy a set of 19/20 or 20/21 to drive around with on the street.

[VENOM V]

The 285/30/18 Hoosier is 24.8" tall and is wider than the 295/30/18, so I would run the 285 or the 315/30/18 in the front.

Good idea. That lower sidewall of the 285 would be a nice match to the stock Kumho height

[SharpMan]

All this has me thinking I might go with the steel rotors (Ceramics are also $10,000 option on Canadian 1 of 1 GTC / ACRs).

That said...I'm not sure they are going to allow me any more changes...I think I'm already driving them nuts...and myself.

[mjorgensen]

The 285/30/18 Hoosier is 24.8" tall and is wider than the 295/30/18, so I would run the 285 or the 315/30/18 in the front.

285/18 Hoosier tread width is 10.6" and 295/19 Kumho is 11.1"

[mjorgensen]

I'm planning on ordering 18" fronts for my ACR as well for the track. No way am I running the front Kumho's from everything I've read. I simply cannot afford to replace my fronts every few sessions. My only concern is as others have said, debris causing damage with the extremely tight tolerances. Who out there has a lot of track miles on 18"' front wheels/CCB's??

Although JD's car with 18" front did get some scratching as he said it is not deep, the very small gap may prevent the larger more damaging chunks from getting lodged in the brake/rim gap like we have seen on the 19" wheels. There is nowhere near enough deflection to worry about contact of rim and caliper unless of course you hit something very hard and bend "egg" a wheel.

[Bruce H.]

SRT and Pirelli discussed the possibility of new tires coming to market for the ACR during the panel discussion at NVE2. It sounded like Pirelli was just one supplier looking at making them in ACR sizes. SRT must recognize the need and are working on it. Hoping something is announced soon for you guys.

[Nambo]

The Michelin's offer a nice footprint, same contact patch in the front with a slightly smaller one in the rear than the Hoosiers. The Kumho's are good for 3 laps and then overheat, then push, then self destruct if you don't back off and let them cool. I don't get enough track time for that crap. Kumho's are great for the street but I am not wasting any more time with them on the track. The front 30/65-18's Michelins have a tread width of 11.8" at a height of 25.6" which is the same as the 315/30-18 Hoosier. The rear 31/71-19 has a tread with of 12.0" at a height of 27.8". That is 1" narrower than the Hoosier 345/30-19 but it is also 1" taller than the Hoosier which keeps the ratio of tire heights closer to stock. The ABS and traction control (I track with it off but wanted to verify if it would work with the new tire setup) both functioned normally with the Michelins.

[mjorgensen]

Just wanted to insert some pictures for this thread incase someone finds it.

https://www.facebook.com/pages/Woodh...n/167968157736

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