911sc Wheel Fitment

[Locker537]

Do you recalibrate the speedo when changing between the 16 and 15 inch wheels?

[Bill Verburg]

Originally Posted by Locker537

Do you recalibrate the speedo when changing between the 16 and 15 inch wheels?

If you are anal, yes, Stock speedo is rarely accurate as is w/ stock tires. The factory did use a special speedo for '76 C3 w/ 205/50 & 225/50x15 tires. I have one on my car and have used multiple size tires from 15 to 16 to 17, I just don't pay much attention to the speedo

[Mr. Merk]

People talking about limited options for 245/45R16 tires as a reason not to run 9's? There are six streetable options available right now. You only need ONE!

I was thinking some consistency to tire size and type would be a good thing. Two sets of similar wheels running the same size and type tires. I suppose I was thinking street tires.

This made me think "why bother?"

This is a "fun" car. Not a commuter car. Might as well make it as much fun as reasonably possible....ALL THE TIME. That was my thinking, and I always run a 100tdw tire on the widest wheels I could fit. I've driven the last 17,000 miles (since March '18) including two cross country trips on "competition tires." I'm not the only one out there doing this.

That being said...It gets cold enough (it's below freezing right now) in Arkansas that I'm considering putting a set of All Season tires on my 6's & 7's so I can drive it more.

[Locker537]

Mr. Merk, I bought the car for HPDE, but do drive it weekly on the street.

The idea behind consistency in tire type and size was to reduce variables and focus on developing my skills. Maybe that is wrong.

I figured I'm going to burn through some tires. Having two similar sets gives options if I have to deal with a flat, etc.

[lgb240]

Originally Posted by Mr. Merk

If you're only using these for track use and you're sticking with 16's. Why not go with 9's?

I'm running R888Rs on 8" fronts and 9" rears

Do you mind posting a pic?
Thanks!

[Driven97]

Originally Posted by Mr. Merk

People talking about limited options for 245/45R16 tires as a reason not to run 9's? There are six streetable options available right now. You only need ONE!

Note the Yokohama ADVAN A052 very recently came out in that size, a fairly expensive but pretty great 200tw tire. Can take the heat at a track day, great for AX, good in the rain (for a extreme perf street tire) and not as loud as the RE71R. Significantly better road manners than the R888r with minimal drawbacks on the track.

Kinda makes me wish I had a set of 16" wheels, as I don't like running the 245/40-15 on my 15x9 rears on the highway. At least that set fits in the back seat.

[Mr. Merk]

Originally Posted by lgb240

Do you mind posting a pic?
Thanks!

https://www.instagram.com/patrickossenkop/

lots of pics here^^

[Mr. Merk]

Originally Posted by Driven97

Note the Yokohama ADVAN A052

I actually plan to try this one next! It looks like a good option and I want to try and fit a 225/50 in front. There are some drawbacks to the shorter 225/45.

[Bill Verburg]

There are multiple versatile tires that can be used to drive to the track and on the track

if using 7 & 8 205/50 and 225/50 or 225/45 whether in 15 or 16 is the way to go, The shorter the tire the more push gets translated to speed and the easier the fit and the lower for better handling the car will be.

when I used 16 205/55 on 7 was tight at the lip when the car is lowered 245/45 on 9 performs considerably better than 225/50 on 98 or 245/45 on 8. But I don't care for the 205/245 balance.

For the street, das macht nichts, but on track 225/45 on 8 and 245/40 on 9.5 is the way to go 15 is going to be way more fun than 16, but again you need expensive aftermarket wheels to get the wheel width & o/s that is needed.

For a budget build I guess 7 & 8 x16 Fuchs are an ok way to go, 205/50 & 225/45 make for better performance that 205/55 & 225/50, You wouldn't be unhappy w/ 7 ( x16 205/50 & 245/45 either you would just need to do something else to dial out the inherent push .

[Bill Verburg]

Here's a strait up comparison of Fuch 15 to 16 both are 7 & 8

[jran76]

Originally Posted by Mr. Merk

I actually plan to try this one next! It looks like a good option and I want to try and fit a 225/50 in front. There are some drawbacks to the shorter 225/45.

I am going to try and beat you to it

Looking at the A052’s in a 225/50 and 245/45 on BBS RS wheels - 16x7” ET23 and 16x9” ET11. I’m expecting both to be a little tight being slightly lowered.

[Kraftwerk]

Glad this thread got bumped (some of the information gets stale though, as to 2011 tire availability)

Thinking to go to 7" & 8" from the oem 6"/7" STILL debating 15" or 16". If I go with 15.. why aren't 15" Fuchs ideal for this? Something about the off-set which I don't understand. I have a very nice used set of 15" 7&8 here, which are new to me. Also have 4 nearly new 7" wheels but the are from a 944 Turbo. They look very fresh, almost brand new.N.O.S. Then I have the OEM 6/7 which came with my car. I might just to buy a new set of 16 x 8" or 9" and run one off the SIX (!) 7" wheels I have in the front....If I go with the 951 off-set, I can then also upgrade to Turbo brakes.. right ? and that can't be bad. Is 9" better than x 8" ...tire size is somehow the same right? Hmm... decisions ...decisions... & I might need to sell some wheels to make this all happen...

[Driven97]

Originally Posted by Kraftwerk

Is 9" better than x 8" ...tire size is somehow the same right?

Assuming you mean with a 245, 9" should be better than 8" because it supports the sidewall of the tire much better.

[darrin]

Originally Posted by Kraftwerk

Glad this thread got bumped (some of the information gets stale though, as to 2011 tire availability)

Thinking to go to 7" & 8" from the oem 6"/7" STILL debating 15" or 16". If I go with 15.. why aren't 15" Fuchs ideal for this? Something about the off-set which I don't understand. I have a very nice used set of 15" 7&8 here, which are new to me. Also have 4 nearly new 7" wheels but the are from a 944 Turbo. They look very fresh, almost brand new.N.O.S. Then I have the OEM 6/7 which came with my car. I might just to buy a new set of 16 x 8" or 9" and run one off the SIX (!) 7" wheels I have in the front....If I go with the 951 off-set, I can then also upgrade to Turbo brakes.. right ? and that can't be bad. Is 9" better than x 8" ...tire size is somehow the same right? Hmm... decisions ...decisions... & I might need to sell some wheels to make this all happen...

Parsing your post:

1) 15" Fuchs are fine for this application, but precious few non-track-centric tires available-If you're not planning on driving too many miles, only drive in warm weather and avoid rain, these tires (and the torque bump caused by their smaller diameter) will give you a fun-grippy experience

2) I'm currently running 911-spec 16x7(f) and 16x8(r) Fuchs with 205/55-16 (f) and 225/50-16 ® tires. This is a good/safe combo, as it allows for a WIDE variety of tire choices. I've chosen to run Michelin A/S3+ tires, which provide year-round drivability (they do quite well in the cold) and good ride/performance.

3) 930 brakes fit fine under both the 911-spec 16" Fuchs and (don't hold me to it) even 15" Fuchs -- certain Brembo combinations do, however, require the 944-spec Fuchs to work -- That said, unless you're tracking your Carrera (and have experienced fade with your stock brakes), you're not likely to realize any performance advantage from a 930 brake upgrade. My Carrera's stock brakes lock up the wheels (and modulate) just fine and I have yet to experience any brake fade

4) 16x9" fuchs -- while these are a better choice than the 16x8 for running 245/45-16 tires, their availability is quite limited and primarily comprised of the streetable-race-ready tire types -- Further, 16x9 Fuchs are too wide to run 225/50-16 tires, making 16x8 a bit more versatile (as you can run either 225/50-16 or 245/45-16 tires on the 16x8s).

[Locker537]

Originally Posted by darrin

Parsing your post:
2) I'm currently running 911-spec 16x7(f) and 16x8(r) Fuchs with 205/55-16 (f) and 225/50-16 ® tires. This is a good/safe combo, as it allows for a WIDE variety of tire choices. I've chosen to run Michelin A/S3+ tires, which provide year-round drivability (they do quite well in the cold) and good ride/performance.

You said it better than I could.

I've been considering a second set of Fuchs and tires that matches what you are running. My thought was it was the right compromise in terms of tire availability, quality wheel, and cost.

[Kraftwerk]

Thanks guys, this helps to decide. As for a future brake upgrades, I hear that stock non-"S" Boxster brakes are a good street-upgrade - don't require any wheel decisions, which is fantastic news, advice courtesy of Bob Kakascik @ Stable Energies NJ, Thanks Bob! (had the good fortune to meet him at Magnus Walker's talk here in NYC last night..)