[Destroyer_1LE]

Im looking to fit 305 all the way around on 19in wheels.

Ive seen a lot of different numbers going around about offset and fitment however I'm lost and need help.

What wheel width and offset do you recommended? (I don't want to have any poke if possible.)


Special Notes:
- car will be lowered on BMR lowering springs
- car is always setup in track alignment
- thinking about doing camber plates and the rest of BMR adjustable suspension parts (however I want to be able to have the fitment without these parts)
- car isn't a daily driver only comes outs for track days, auto cross, canyon runs and the occasional car shows.

The help would be greatly appreciated.

[FNxR3DNECK]

+1000 to this!!! I want to run 305/30/19 RE71rs for my dedicated Auto X setup next year and need to know the best offsets and what not for it.

[Destroyer_1LE]

Yeah I seen a couple people running 305 up front on a 305, however they have a little poke and I've seen people modify there struts for the clearance.

[seanblurr]

If you want a 305mm tire up front it will poke. There is no getting around that.

[Destroyer_1LE]

Originally Posted by seanblurr

If you want a 305mm tire up front it will poke. There is no getting around that.

How much poke and what offset do you run or recommend?

[LSmith353]

Check this thread
http://www.camaro6.com/forums/showthread.php?t=495728

[FNxR3DNECK]

So I have to run 19x10" front and 19x11" rear to stay legal for A-Street, what would be the ideal offsets for these with the 305/30/19s? Like I said these will be dedicated for Auto-X so poke isn't a huge deal but I would like to minimize it if possible.

[seanblurr]

Well, first, what is your main reason for wanting 305's on the front? Do you find the car needs more front grip? Do you want to be able to fully rotate tires? Just want that badass more filled out look?

I did the research and had the first set of wheels for the Camaro made in 19x10.5 +14 for the front, I did this because, personally, I could care less about poke for a track wheel. I also much prefer to have a wheel that pokes, but an unmolested strut, then a wheel that pokes slightly less but a strut that I had to cut parts off of. Understandably, the tabs you have to cut down aren't really a big deal, I just preferred not to have to do this. Anyways, the 10.5 +14 wheel ended up with these specs because I wanted to maintain an identical inner strut clearance to the stock front wheel. If you don't mind cutting the strut, you could probably get more 2-4mm more clearance, so add that back onto the wheel offset. Say, 10.5 +17. If you ran a camber plate, you could get all your camber from that and zero out the stock camber bolts giving you even more clearance at the strut, say something like a 10.5 +20. You would still have more poke than stock, but not a huge amount. Personally, all these theoretical's are a hassle, hence why I just dealt with the poke from the get go. If you want to be the guy who actually tests it, go for it

As I said in your other thread, I wasn't happy with my first set up. The car felt like junk and I ended up going back to my stock wheels and G3's and had way more ****ing fun. The car is an absolute animal completely stock. It turns out I had a few bent wheels, and I'm wondering if the bends were causing the MRC to freak out with rapid adjustments which caused the car to be all over the place. Other members have had success with bigger track tires, so i'm leaning towards a fluke issue like this, rather than the car just doesn't like stickier and bigger tires. I've got a new plan in the works, but it may entail 295/315 or 305/325. I'm not sold on 305 all around.

Lastly, not to try and rag on you at all. But, why the upgrade to BMR's full suspension kit, or even springs for that matter? Did you find something in the stock 1LE's package to be lacking?

[seanblurr]

Originally Posted by FNxR3DNECK

So I have to run 19x10" front and 19x11" rear to stay legal for A-Street, what would be the ideal offsets for these with the 305/30/19s? Like I said these will be dedicated for Auto-X so poke isn't a huge deal but I would like to minimize it if possible.

I would not run a 305 on a 10" wheel.

[JeromeS13]

Originally Posted by FNxR3DNECK

So I have to run 19x10" front and 19x11" rear to stay legal for A-Street, what would be the ideal offsets for these with the 305/30/19s? Like I said these will be dedicated for Auto-X so poke isn't a huge deal but I would like to minimize it if possible.

If you're trying to run A-Street, you can only go +/- 7mm offset (from what I recall). If you're trying to squeeze a 305 up front, I would go with the lower offset (for more clearance), which would be 19x10 +13.

[mjk3888]

Just some references I use when I'm toying with the idea of new setups. Use the will they fit site for wheel diameters and offsets, but note specific tire dimensions from tire rack.

http://www.willtheyfit.com/index.php...=11&offset2=20

I actually found out that our Goodyear Supercar 3's measure at (285/10.8" tread width) and (305/11.8" tread width).

305/30R19 RE-71R's measure at 11.1" tread width.
295/30R20 RE-71R's measuer at 10.7" tread width.

Yes you read that right! The 295 bridgestones are actually narrower than the OEM 285 Goodyears

A few other sizes I found interesting
-NON R GT350 Michelin Pilot Super Sports (295/10" & 305/10.7")
-GT350R Michelin Pilot Sport Cup 2's (305/11" & 315/11.7")
-5th Gen Z/28 Trofeo R's (305/11.6")

[tx6g1le]

Originally Posted by FNxR3DNECK

So I have to run 19x10" front and 19x11" rear to stay legal for A-Street, what would be the ideal offsets for these with the 305/30/19s? Like I said these will be dedicated for Auto-X so poke isn't a huge deal but I would like to minimize it if possible.

Seconded! I did and regret it greatly! I now have a 295 on the front OEM 20 and it's a much better tire combination with our 10" wide front wheel.

[mjk3888]

Originally Posted by seanblurr

I would not run a 305 on a 10" wheel.

The Bridgestone is within 3 tenths of the OEM 285's tread width. It will be fine. See my post above. All 305's are not equal. Specs vary from brand to brand.

[FNxR3DNECK]

Originally Posted by tx6g1le

Seconded! I did and regret it greatly! I now have a 295 on the front OEM 20 and it's a much better tire combination with our 10" wide front wheel.

Regret what exactly? Putting the 305 GY on your stock 20x10s? Like Mike pointed out the RE71Rs in 305 are quite as wide so they shouldn't feel as "sloppy" or whatever on a 10" wide wheel.

If I was to stick with the stock 20s I would do what you are with a 295 square set up of RE71Rs, but I want to go down to 19s, mainly for the weight savings but also so I can get a little more tire up front. I would just do 285/35/19 front and 305/30/19 rear but that would have the fronts with a larger diameter than the rears which I don't want.

I understand the "Don't put a 305 on a 10" wheel" argument but I have seen PLENTY of people run it on other cars(specifically the RE71Rs), including 5th Gen 1LEs for Auto-X. These WILL NOT be track wheels/tires, only for Auto-X if that matters in your argument, I will probably only attend 1-2 track days a year so I plan to use the stock setup for those.

I do appreciate the different view points, just trying to figure out what will work best for me haha