[txn5060]

Brother gave me his set of used Wheels/Tires and was wondering if it will fit in my 968 (not lowered or anything)

 

BBS Classic II (7.5 x 18) ET50 with 225/40/18 and (10x18) ET65 with 265/35/18

 

What would I need to make it work on my 968?

 

 

 

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[bombfactory]

Yes those will fit fine with no issues.

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[flash]

Yeah - fit will be fine. Weight is another story. Those are really heavy. Expect the car to be slower, use more fuel, and have less braking.

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[txn5060]

Thanks again for the quick reply.    I will try to mount it this afternoon and report back with pictures

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[Cloud9...68]

Also, the front-to-rear differential is huge for a car as well balanced as the 968.  But if it's a street car, you'll never notice the impact of this, or the weight - Grassroots Motorsports ran a test on the impact of wheel weight on a Miata, comparing wheels that were a whopping 12 pounds different.  It only made a couple of seconds of difference on a track that produced times somewhere in the 40s/lap range, iirc.  While this would be significant in a race, I was surprised at how small the difference actually was, after hearing for years how important having the lightest possible wheels is.  But heavier wheels may also degrade ride quality a bit, but again, it's questionable whether you'd notice.

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[flash]

the effective difference between the OEM 17s and the 18" SC2s is the same as adding 150# to the car.  more if you are running 16s.  so, if you can tell the difference between just you, and you and a passenger, you will notice the difference.  it's not easily reflected in time, but it is certainly easy to feel.  with the power levels as low on the 968 a they are, every little bit counts.

 

yes, ride comfort can be compromised by heavy wheels.  the shocks and struts have to work that much harder to dampen the motion of the springs.

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[ds968]

I can tell you that I can feel the difference by just adding 4 lbs to each wheel ( that's what steel bolts / bolt-thoughts that come with 15 mm or bigger spacers weigh ) so the 16 lbs total on the rotating mass translate into approx . 74 lbs worth of weight on your car. I no longer notice that now with a supercharger on the cars, but with when they were N/A, even I, and my very insensitive butt-o-meter felt the drag for the first couple of acceleration seconds until you really got going..

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[txn5060]

Looks like I need some spacers for the front and rear to fill the wheel wells nicely.    My previous set was 18"  993 Cup (8x18) ET52 with 225/40/18 and (10x18) ET47 with 265/35/18.

 

What quality spacers/sizes are out there for our beloved 968

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[flash]

"quality" and "spacer" are diametrically opposed terms.  spacers are not recommended on any car, and are banned by most sanctioning bodies.  i especially do not recommend them with heavy wheels, as the increase in force can cause loosening.

 

if you use ANY spacer, you MUST change to steel lug nuts.  they only left exactly the amount of threads needed for the aluminum ones.  any spacer would reduce the number of threads, making it necessary for steel nuts.

 

further, if you go more than 8mm, you will need to go to spacers with their own set of studs, which will be much heavier.  you will quickly get into a situation of getting the crap beaten out of you by the 405

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[ds968]

It's only racing bodies that prohibit spacers , and I wouldn't be surprised if that didn't come as a result of a few bozos who either did not use the right bolts or did not torque them correctly, causing problems ..not to mention that racing bodies are so anal retentive and paranoid about anything and everything, that any given rule does not necessarily have to have a logical reason behind it. Heck , even Porsche produced some cars which came with spacers from the factory ( though I can't figure out why they did not just make different offset wheels ) and for a while you could buy the spacers at Porsche dealer parts depts. They're perfectly fine as long as you stay within prescribed parameters and don't go wild with anything that exceeds 25 mm. I have 20mm on my front wheels, 15 mm on the rears. And you can find quality spacers, but for anything over 5 mm, make absolutely sure you get longer steel bolts and steel lugs/nuts for them. I got my spacers and bolts from Vertex Auto, IIRC.

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[flash]

but yours are the double stud type.  those can be just as dangerous.  i've seen them fly off of even street cars.  lost a set off of a 72 duster and it wasn't pretty.  it all depends on things like how you drive, how well the tires were balanced, and how often you check your torque.  just because it hasn't happened to you does not mean that it does not happen.  i've never been hit by a bus either, but i'm not inclined to jump out in front of one.

 

as for the 5mm thing, again, if you put ANY spacer on these cars you MUST change to steel lug nuts.  aluminum lug nuts require 1.5 times the diameter of the stud in amount of thread engagement.  that is a standard engineering fact.  these studs are 31mm long.  the flange of the wheel is 10mm.  that leaves exactly the 21mm required to maintain torque.  it's no coincidence that it is what porsche gave us.

 

steel lug nuts would allow a 7mm spacer to be used without changing to longer studs.

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