blown81bu

Jus did mine today..i have 18 by 5 in the front 3.2 back space w a 5 mm spacers left side barely clears and right side jus touches the caliper
Z51 front brakes w med pad weld rts

I'm not sure what to do..lol

jxhunte

lt1z, did you notice a performance change with the taller 295x45x17 DR's. I'm contemplating your exact set up. Currently running 305x35x18 MT ET Street DR's. Going with your set-up, I would be moving from a Diameter of 26.4" to 27.2". Wondering how the larger diameter will impact my 60' and ET. No traction issues with my 305x35x18 MT's but would like to upgrade my wheels to the Weld RT-S Drag package and 17 inch wheels.

realcanuk

I went to 325/45/17 which are about 27inch tall. I didn't really get to test them well, but the few runs I got in, my 60 was down from mid 1.6s to abouth 1.50.
I think it depends a lot on setup, power , transmission and gears.

realcanuk

I guess you need to try a slightly bigger spacer. I have the 18x7 and they work perfectly with a 5mm.

under_psi

This is the only picture I could find of a narrow body on 15s. Mine shipped from weld yesterday! ill post pictures as soon as the car is done.

narfdanarf

that car has a rear widebody though....I can't wait to see what your car looks like!

narfdanarf

Ready for some pics :-p

lt1z

Hard to say. My car makes around 750 rwhp so I think the taller tire helps me.

realcanuk

It is hard say. I get a better 60 with my M&H which are just over 27 inch, but power and gearing will effect this. I like the taller tire to bring down my gearing a bit, but I have 3.42's.

jxhunte

The more I read on the subject of tire height, the more convinced I am that moving from a 305/35/18 to a 295/45/17 will more than likely negatively impact my 1/4 mile performance and not help or improve my times. No idea of my HP (LS2, Ported TB, E-Force, 10lbs of Boost, Crane 1.8 Quick Lift Roller Rockers, Kooks long tubes - high flow CATS - Alky Control Meth Injection, A6 with OEM Stall Converter and 2:56 gears). I was thinking of upgrading my wheels, going with the 17" WELD RTS for the rear and 18's for the front. I will be upgrading my OEM stall, going with the Yank 2800 which has been taking up room in my garage since Sept of 2012. My guess is that I will be better off with the 305/35/18's. If I find that after installation of the stall that traction becomes a problem, I will consider going with the 295/45/17's and Weld RTS wheels. Anyone running 18" Weld RTS wheels on the rear?

realcanuk

With the 2.56 gears I a shorter tire would be better. I may get an extra set of Welds for the rear, in 18 inch. I want to have some street tires just to put on for road trips. I don't mind drag radials daily around town, but not when going to far.

jxhunte

For the road, I have my OEM wheels e/w Firestone Firehawk Runflats. I have widened 18" OEM wheels e/w 305/35R/18 MT ET Street Radials for the Track. I like the look of the Weld RTS and believe they are lighter and more of a Drag Package than my current set-up. If after the Yank 2800 converter install and I find traction is not an issue, I will probably look into 18" Welds for both front and rear, a dedicated drag package for the track.

lt1z

Shorter may be better with 2.56 gear but the difference between 26.5 and 27.2 is not that much.

I have a second pair of rears in 18x10.5 wrapped in 305/35/18 R888 for airstrip events/street driving. I run the same 18x7 fronts all the time wrapped in pilot super sport 225/45/18.

under_psi

So if you are planning to run 15s in the back on a narrow body, be prepared to have to go to a widebody.Appearently, "ZO6" fitment (pad and offset) is the same as "narrow c6" fitment. Meaning its the same exact wheel in the back for both cars, even though you would think they would have to be 2 different offsets. It sits flush in widebody application, but since its the same wheel, throw it on a narrow body and you get this...







As you can see, especially in the last picture, it isnt going to work. Tire sticks out 2". I didnt see this coming, and now I wilp be doing a ZO6 rear to make it work. Weld does not make a true base c6 15" rear wheel. Their application guide shows the same wheel for both the ZO6 and C6. I should have realized that.

Other than that, wheels look great. Fronts are using a 1/4" spacer just like they recommend. There is only like 100/1000 clearence between them and the calipers though. Im kind of concerned with flexing, but as they are they dont touch. 18x7 in the front.

realcanuk

That sucks about the rear. Good excuse to do the wide body though. It's easy enough to do and looks great. . The fronts are extremely close to the calipers on mine too but it's not an issue. Nothing moves there.

I answered you PM by the way.

narfdanarf

Can you please measure the inside diameter of the rear, I am trying to see if a CWI wheel will fit because they offer a bigger backspace than the welds.

narfdanarf

Also I'm wondering if you didn't have the outer beadlock with adds 1/2" and you went with the 275 instead of the 295 if it would have fit?

under_psi

Cant say for sure, but even without the beadlock and smaller tires, it would have still stuck out. Its just not the correct offset. These are ZO6 fitment wheels.

Meanwhile, vette went off to the body shoo today for widebody rear conversion. We got the parts straight from GM here locally. Some pics before she was sent out:

Fronts:




They look soooo good lol. I was originally going to coat them black, but I just couldn't bring myself to do it, neither could my shop! Lol.

5 Liter Eater

Do they? Looks like there may be some interference there. I run a 275/45/17 mickey on WS6 wheels which are 9.5" with a 56mm offset. It works but it's ghetto and they rub just a scosh. Looking for something nice.

jxhunte

Anyone have snap-shot of 18" Weld RTS e/w 305/35/18 on the rear of a base C6?