Gh05t

I'm building my C5Z06 to run CAMS (in autox) so its getting Borg delrin bushings, Aldan American coilovers and wider front wheels and tires.

In an effort to save money and the ability to rotate wheels/tires, I'm planning to buy 2 wheels for the front which will be 18x10.5 Now according to House of Wheels, the stock 18x10.5 rear wheels are backordered for 45 days.
So, I was looking around at aftermarket wheels, TSW and Enkei has some 10.5" wide rims but with a 65 offset instead of the stock ET58.
I'm wondering if its possible to run 315/30 Yoko A052 on the fronts on ET65 without rubbing the suspension bits? Is anyone running with this setup?

vettehardt

I can't speak for the wheels you are looking at specifically, but I know of some that will work. Look at the OE wheels on Ebay. The cheap 18x10.5 wheels have a 56mm offset and will work on the front of a stock C5Z06. They are actually pretty good wheels. My dad uses them on his C4 ZR-1 and on my brothers 04 Z06. I also know of a guy running nasa time trials and wheel to wheel using these wheels on the front of his race car. They have several styles to look like different corvette wheels. I don't know what aftermarket brakes they will clear though.

captain awesome

They will rub. I had a set of TSW Interlagos and they rubbed at full lock. Also by going higher offset, you're giving up trackwidth thereby raising the Cg of the vehicle. All this translates to reducing the handling capability of the car.

How much is it reduced? I don't know.

69autoXr

65mm is probably too much on the front, especially if you're thinking 315 A052's; they run wide for their sizes. Might want to search the internet for that info and consider the 295 for the front on a 10.5.

NSFW

My track setup is TSW Nurburgrings, 18x10.5 @ 65, square, and IMO they're fine.

My tires contact my brake ducts before the wheels get a chance to touch the suspension, so I'm not sure about that aspect. Maybe without ducts I would get wheel/arm interference. But I wouldn't lose any sleep over it.

My outside edges are flush with the front fenders, so I would expect some poke with a lower offset. But some people say they have none with OE rears, so I'm guessing the physical dimensions are closer than the published specs would have us think.

0Spec Corvette

You want an 11" wheel with a +55 offset. We race with this wheel and have no issues. 65 will rub on the control arms on lock as well as the inner fender liners under full compression if the car is low.

smitty2919

Play with these types of calculators
https://www.1010tires.com/Tools/Wheel-Offset-Calculator


I also run OE Wheels 10x10.5 square and 315's. I rub top of fenders (at full dive) and front side of wheel wells (at full dive and LH turns). My upper fender rub can be cured by more ride height or stiffer springs. 315's also slightly poke so be aware of that.

And why Aldan coilovers??? Heard/read horror stories about them. Much better options out there.

Mrsideways

315 A052s will be pinched on a 10.5 as others have said. Heck they looks slightly pinched on an 11. I ran the 315s on 12s all the way around for CAM S at Dixie this past march. They worked well but wow they wore fast.

Scooter70

Can you run spacers? +65 - 1/4" spacer = +58. Now you're back to the same position as the C5Z rear wheel. Depending on camber settings, you may need a little more spacer to keep the top of the tire from rubbing through the inner fender.

smitty2919

^Yes

Need longer studs for spacers. With a 1/4" spacer I assume you lose the ability for the wheel bore to "center" on the hub unless you get spacers with integrated centering lips like Eibach ones.

https://tiresize.com/wheel-offset-calculator/

Unless you HAVE to have those wheels mentioned for whatever reason, there are better/easier wheel options that "fit" without needing spacers. Like mentioned OE Wheels 18x10.5 +56 work with slight rubbing using 315 Rivals at extreme conditions. But like Mrsideways said, a 315 on a 10.5 is technically pinched, but A LOT of guys run that combo.

Something I have contemplated is keeping a 10.5 wheel but going down to a narrower tire. I have never tried more of a 1:1 wheel tire combo. I've only used 315 on 10.5".
315 = 12.4"
305 = 12"
295 = 11.6"
285 = 11.22"
275 = 10.8"

NSFW

I run a 3mm spacer on my rear street wheels and still get full thread engagement and good-enough hub centering.
Never tried it with my 65-offset track wheels but maybe that would be the sweet spot between inside rub with +65 and outside rub with +58.

chetly

Like others have said, I wouldn't run the 315 yokohama on a 10.5in rim. For my CAM-S setup I'm running their 295 on an 11in rim. 315 on a 10.5 is going to buldge like crazy and have no response.

smitty2919

So going to a 295 on 11 would maybe be similar to a 285 on 10.5? I assume the added steering response is a bigger benefit than the possible reduction in grip from the narrower tire vs a 315? In terms of autocross specifically.

I'm local to Danny Popp/Paul Curley drivers and all these guys are on 315's with anything from a 10.5" wheels to 12" wheels (mostly OEM C5Z rear wheels) with OPTIMA type events in mind. So I guess I fell in line going to 315's on 10.5 but like I said I had been thinking to go narrower. Used takeoffs also play a factor staying 315's for me

chetly

We ran 315/335 Rival S on 11/12's last year on my buddies C4. Mid season we jumped on the Yoke bandwagon to try them out. We put the 295 on the 11 and the 315 on the 12. Measurement wise, it would have been like BFG making a 305/325 combo. The 295 Yoke is smaller than the 315 BFG, but the 315 Yoke is bigger than the 315 BFG. The car had better turn in with the 295 Yoke vs the 315 BFG. Part of that was being smaller in size, they were able to heat up faster because of the smaller footprint. This year i'll have my C5 back and plan on making the switch.

Gh05t

Thanks for all of your replies guys!
I'll run 295 Yokos, seems like everyone is of the opinion that the 315 tire will get pinched by the 10.5 rim

I would like to get Aloca wheels but they are backordered for at least a month from the factory as per House of Wheels right now...may just have to go ahead with TSW wheels on 65 offset...

Gh05t

So your tires contact when you turn the front wheels? What tires are you running and how much lock before they start rubbing?

NSFW

Yoko AD08R, 295/30/18, and I get just under one turn of the steering wheel before they rub.

But it's my brake ducts they're rubbing.

Mrsideways

I'm on 18x12 +50 front and rear with 315/30 AD052's and at full lock they touch the sway bar but I've got no rub anywhere else. When I set up the bump stops I lowered the car on the alignment rack with wheels on and no springs and measured at what point the tires touched the fender and the amount of bumpstop needed, removed suspension and installed bump stops and shimmed em back and forth till I was happy that the spring+Bump stop would keep tire off the fender.

NSFW

I should have mentioned my brake ducts.... I'd have more steering range without them.
And I keep hearing they're not actually useful with a big brake kit, so I often wonder if they're worth putting up with.

Gh05t

Thanks a lot y'all!
I finally went with TSW nurburgring 18x10.5 with 295/30 Yokohama A052 tires. The front rims rub the control arms at full lock, but they dont if I stay below 1 turn of the wheel. I can live with this since I dont daily the car.