LS2KING

Id really like too get the 345 MT drag radial im just concerned with the rear inner clearance after the 18s are widened. Any opinions Gents?

rpmextra

Just out of curiosity what kind of power are you putting down?

dbratten

In my experience with 17" wheels I had to start with a replica 9.5" wheel to end up with the correct offset after widening on a base model -- which it looks like you have. All width is added to the backside. 10.5" wheels that I found did not have the offset necessary to fit under the fenders even before widening.

I use a O.E. Wheel 9.5" rim with a starting offset of 54-56mm will allows 2" addition and still clear on the inside. I run a 335x35x17 Kumho 710.

https://www.corvetteforum.com/forums...post1578047054

--Dan

LS2KING

Roughly 600whp on a 150shot y bud?

LS2KING

Wow thats a excellent answer my friend. So getting the 10.5 widen too 11 or 11.5 wont "look" good or it wont work?

dbratten

Typical 10.5" wheel has a 58mm offset. This puts the outside edge at 3.5" from the hub. Your OEM 19x10" wheel is out 2.4" -- so one more inch to the outside. Many folks run the 10.5" square setup but I believe they use smaller tires like a 315 max. In any case, your can add 1" to the inside of the 10.5 and that will fit.

Much will depend on the height of the MT drag tire and if you're lowered. For autox/track we run camber which tucks the top of the tire in which I doubt you will do. My race tires are shorter than OEM.

Mock up some cardboard in your tire diameter and test it.

--Dan

LS2KING

Im not lowered so your saying i "might" be ok with another inch(11.5) depending on MT size? So if i just got them too 11in i would def clear correct?

C6David

Only problem with widening a 17x9.5 to a 11.5 is a arm clearance when the suspension is fully extended. I got my 17x9.5 oewheels widened to 17x11 to fit my 315s in the base model fenders and they almost touched the upper a arms. With the car being stock height it wouldnt hurt to start with the 10.5 but the wheel will stick out of the fender.

C6David

This is the clearance I was talking about. This is with the 9.5" wheel. I wanted to widen them to a 17x11.5 but it just wouldnt clear it. Other pic is the wheels after widening. Then them on the car. 315/35/17 hoosiers. If you wanted to run a narrower tire you could go with a 305/45/17 et street r on a 17x10.5. I was spraying a 200 shot out of the hole on the track. On the street had it coming on at 3500 dead hooking on the hit. Doesnt spin in first gear. Which is what I have in the last pic.

C6David

Woops. I just re read the first post and realized you were looking for 18's.

LS2KING

Beautiful car man... So a 18 should have a better time with clearance correct?? 10.5 too 11.5 with a MT 345 wrapped

C6David

Correct. The wheel will have better clearance on the a arm. The rim/tire will still stick out of the fender some though.

dbratten

Yes, a-arm clearance is an issue. I have COs so not as much droop. My 17x11.5s clear by 1/16" when jacked up. 18s should be less of a problem.

--Dan

dbratten

You need to measure for yourself. Forum members (me included) and tire & wheel suppliers can't guarantee a fit without seeing your car when the clearances get close. There are too many variables. Also the tire diameter and profile will be a factor.

--Dan

HOXXOH

Not trying to be a SA, but 600 on a 150 shot doesn't need anything more than 275/40x17 Dr's to hook. You can do that on a 9.5 wide x 17 wheel.

What 60' times are you getting now and with what tires?

rpmextra

That is kinda why I asked. I personally think a 275 is a bit small but I'm in the 600-620ish range and my 315 on a 9.5" 17 hooks hard. Best 60ft so far is a 1.46. I consistently hit 1.50 almost every launch. if I had some gear I'd do way better

HOXXOH

I assumed he would launch with 450 hp and the 275's would easily handle that. Then after he's rolling, he'd hit the spray.
He'd need to run 315's with lower pressure than 275's to have an advantage if he sprayed on the launch, so he better have more hp to carry him through the traps. I'm 1.48-1.50 with a whole lot less power on 275's at 18-19 psi on a 9.5 x 17.

If you're hooking hard, you need to either launch harder or raise pressure.

LS2KING

Yes im not spraying out the hole,not wanting too grenade my rear end. Looking for the performance and topped with some stance is why i want 315,325,345 rear tires and MT has 345

HOXXOH

Am I correct in assuming you don't race at the track and are more concerned with the appearance than the performance?

It's OK to want to look like a fast car, rather than be one. Just don't expect to perform like one without the right stuff.

LS2KING

Actually 50/50 i was just at Street Car Takeover and my 285 street tires were practically worthless. Street rolls was practically all i could perform with on behalf of my crap launches. Looking for both pal, if i can get a 2nd set of rear wheels too throw on for track it be nice too have a 10 sec Vette as my Dailey but cant do that with current tires.