FD3SLS1

iTrader: (1)

I'm in the process of building a heads cam LS3 to go in my 05 CTS-V and I have a feeling the stock 245/45r18 isn't going to cut it...doesn't really cut it now as it is

I know a 19x10 with a 285/35r19 with fit with zero problems.

If I install a set of Creative Steel trailing arms and roll the fenders will a 19x11 with a 325/30R19 or a 305/30R19 fit?

I don't have any plans of lowering the car

Bio248

"zero problems" = rubbing the trailing arms, rubbing the fenders ?

you're going to have a hard time fitting anything more than the forgestar rear with something like a 295 super max.

barrok69

What is your definition of "fit".

Flush to the outer fender? inboard of outer fender? Sticking out of fender?

You'll have to grind away some metal on the inboard side of the suspension if you want to get anything larger than a 10.5" wheel back there while maintaining a tire that sits inside your fender. I've seen guys running 295's and 305's in the rear on 10" wide 18's that are flush to the outer fender. Not sure about 19's though.

FD3SLS1

iTrader: (1)

Flush to the outer fender, I guess I could run 18's if it makes it easier to run a larger setup

barrok69

From the measurements on my car (my car being lowered) I can fit a 295 Michelin PSS on a widened stock 18"x10 wheel with stock offset without issue. i'm running CS wide trailing arms for the record. I was also looking at doing a 305 tire on a 10.25"-10.5" widened stock 18" wheel while employing a 5-6mm spacer behind the stock offset wheel and it would still be slightly under flush to the outer fender.

I've already had my current wheels on my car widened to 9" to run 275/35R18's all around and the fitment is really nice, lowered with no rubbing and 5mm spacer up front.

Weldcraft did the wheels for me and they came out great. A great option if you like the stock looking wheels. My wheels were the polished twin 6 spoke GM accessory versions. I wasn't a fan of the offset choices on the 19" Forgestars so there weren't really many other options than to go full custom or widen stock. Plus I really like the look of the GM wheel.

FD3SLS1

iTrader: (1)

Well my first choice was to have my stock wheels widened by weldcraft but the 6 to 7 week turn around is kind of a issue since my car is my daily driver. So I'm not sure, I just might buy two spare wheels and just do two wheels at a time.

I'm thinking 18x9.5 in the front and 18x10.5 in the rear.

NIKDSC5

iTrader: (10)

For the record, I measured my 2.5" springs width of my true cool over setup, and compared with the factory shock housing.....and in true cool over positions you lose 5/16" of clearance on the inside of things.

Just a heads up if that is in your future!

barrok69

I bought a second set of wheels and drove it over to them It still took 4 weeks. You can always sell your "stock" set when all said and done so you don't lose any turn around time or much $. I paid the extra to have the welds ground down so I didn't have to worry about my V2 brakes not being able to clear the inner barrel welds.

With 9.5" up front there should be room, but it will be very tight. You'll need at least a 12mm spacer to clear the knuckle and you'll have to run aggressive negative camber to clear the fender. It will be borderline flush/ maybe slightly over flush to the fender. You'd have to drop a step in sidewall height.

I don't think you'll see much issue with 18x10.5" with a 5-10mm spacer.

For example here is my car with -2.00° Camber up front- 18x9", 5mm spacer with 275/35R18 and lowered on kw3's. (rear 18x9", no spacer, stock looking fitment, -2.3° camber)

FD3SLS1

iTrader: (1)

Looks like 18x9 will be just fine but I just might leave them alone since stock is 18x8.5 and just do the rear wheels. $235 a wheel for just a .5 inch may not be worth it.

barrok69

I think JD03Cobra? was another member on here that has 275's on his rear wheels and I didn't like how the sidewall bulged on the stock 8.5" wheel so I bit the bullet and did all 4 of my wheels to 9" with intent to possibly go wider in the rear down the line. It's nice being able to rotate tires right now Plus all the Porsche guys keep on taking the 295 Michelin PSS tires I want out of stock so they are forever on backorder!

4doortypels

iTrader: (39)

I spoke with CS about it a while ago. They told me a 305 is about the max you can do when you get the stickers widened. I hope I'm not miss quoting on here but I spoke to Max when the second line of trailing arms was released. He said after 305 you have interference with the stock shocks on stock ride height. I'm currently running nt05rs on the rear at 285/40/18. With eibach rear springs. They do pretty good so far. Anyone tried the new nittos yet?

barrok69

Those NT05R's are decent drag tires. Not ideal for cornering though. I prefer the Bridgestone RE-11's the best for ultimate handling in wet and dry and the Michelin PSS for the best overall tire for handling/balance/comfort/noise and life.

actrite80

iTrader: (2)

If you like the re-11 check out the new re-71r

actrite80

iTrader: (2)

http://http://www.prima-racing.com/b...king-part-one/

barrok69

For a track only tire I would go with the RE-71R. If I saw a puddle on the street with those tires though I think very bad things would happen. The RE-11a's are amazing in the wet so I would probably stick with those as an all around max performance summer tire.

Nintastio

I have a built LS3 in my car also and I really want to go with something wider than the 275's that are on it.

FD3SLS1

iTrader: (1)

Well when it comes to tire options in a 305/xxR18 you have drag radials and road race tires. So to get a tire that has any life in it what so ever I'm going to have to stick with a 295/35R18.

Now the stock tire 245/45R18 and the 275/40R18 both have a 26.7 in diameter but the 295/35R18 has a 26.1 in so to keep the front and rear tires close in diameter I'll have to go with either a 255/40R18 at 26.0 in or a 265/40R18 at 26.3 in.

TorchRedRob

iTrader: (1)

I just got a set of 255/40's all around. I have seen several pictures of it and it seems to work fine (mine aren't mounted yet). I think the ticket would be 255/40 and 295/35. That's probably the direction I will go on 8.5" and 10" widths. The Nitto site shows the invos in those sizes are 26.06 and 26.02 diameter when installed on 9" and 10.5" wheels, but says they can be installed on 8.5" and 10" wheels (at the minimum). I may go 10.25 or 10.5 in the rear, but will likely stick with 10" since that has been proven. Granted, I'm probably 1-2 years away from doing it, but I'm trying to lay my plans and budget now.

actrite80

iTrader: (2)

That's what I run but on team dynamics 255-40 295-35

Sssnake

How much camber are you running with your setup. I have the forgestars and 275s. If I don't run a good bit of negative camber then they occasionally rub...

They are very nice but have become a little loud on my car.

The tread pattern is not conducive to wet driving but they are not that scary if you pay attention. The noise is what will likely relegate these to track tires in the future.