930 Tires in 2025?

[Mr. Merk]

Originally Posted by zakthor

For pressure I started with stock 29/34.
If they last > 7000 miles and don't get too noisy then these are my new favorite tire.

I bet at those pressures you'll wear out the center. Like I said, keep an eye on the sidewall indicators and adjust pressure accordingly. I'd love to see you wear these out at 3000 miles from having lots of fun, not from over inflation.

[zakthor]

Originally Posted by Mr. Merk

I bet at those pressures you'll wear out the center. Like I said, keep an eye on the sidewall indicators and adjust pressure accordingly. I'd love to see you wear these out at 3000 miles from having lots of fun, not from over inflation.

Yeah if I go to an autocross. Like I said they seem to be too sticky for the street.

What pressures do you recommend for a stock '79?

Is that your tire? What car? What are your impressions?

[Mr. Merk]

Not my tire—just a close-up of the sidewall indicator on yours.

I usually run R888Rs or A052s and tend to keep cold pressures in the low 20s up front and high 20s in the rear.

You already noted the stiffer sidewalls, which means they don't need as much pressure to support the car. I wouldn’t be surprised if you could drop another 5 psi and still stay above the triangle wear indicator. Just keep adjusting until the wear line sits right at the tip—that's usually the sweet spot for both ride quality and maximizing tire life.

[zakthor]

Originally Posted by Mr. Merk

Not my tire—just a close-up of the sidewall indicator on yours.

I usually run R888Rs or A052s and tend to keep cold pressures in the low 20s up front and high 20s in the rear.

You already noted the stiffer sidewalls, which means they don't need as much pressure to support the car. I wouldn’t be surprised if you could drop another 5 psi and still stay above the triangle wear indicator. Just keep adjusting until the wear line sits right at the tip—that's usually the sweet spot for both ride quality and maximizing tire life.

Low 20s in front! Is that on a 930 with stock wheels?

With the re11 when cold pressure got down to even 25 the car felt boggy to turn and were less grippy. At 29 (32-33 hot) I can steer with my fingers. I’m wary to drop pressure so low since my tires have always worn well - doesn’t the picture above of my old front tire look ok? [edit: doh that’s my old rear tire, I’ll see if I can find one of front.]

I haven’t found any documentation about tire pressure and those triangles. Do you know of any? Could it instead be a roll limit indicator for setting min pressure when competing?

[Mr. Merk]

Just a Carrera on 951 8s and 930 9s

Remember what you said about the stiff sidewalls, that's going to correlate to pressures.

I was taught to check the wear line in reference to the triangles after driving hard (or competing) and adjust the tire pressure up and down to maximize the contact area.

I once set my tire pressures to stock when running R888Rs and quickly wore down the center of the rear tires and had terrible handling to the point I thought something was broken. Dropped about 10psi and all was well.

[mark houghton]

I run mine at 30 and 37 stone cold. Works fine with the OEM Fuchs on my 930 for everyday highway and twisties driving.

[zakthor]

Originally Posted by Mr. Merk

Just a Carrera on 951 8s and 930 9s

Remember what you said about the stiff sidewalls, that's going to correlate to pressures.

I was taught to check the wear line in reference to the triangles after driving hard (or competing) and adjust the tire pressure up and down to maximize the contact area.

I once set my tire pressures to stock when running R888Rs and quickly wore down the center of the rear tires and had terrible handling to the point I thought something was broken. Dropped about 10psi and all was well.

I'm driving stock 7 and 8 and my car is heavier. Tire calculator says I would drop 2psi if I switched to 8 & 9 on my car. Right now the tires feel sticky and the turn in is so hard that I can't tell what the tires are doing. Really feels like rails but my critical mind says the limit must be close.

Originally Posted by mark houghton

I run mine at 30 and 37 stone cold. Works fine with the OEM Fuchs on my 930 for everyday highway and twisties driving.

Close enough. Aren't you running bigger tires than me?

But...

Question Mr. Merk raises is about this tire and its stiff sidewalls.

For autocross I can look at tire temps but for street driving my primary goal is tire life. I just don't know how to adjust pressure for a particular tire, especially because these are so sticky.

I go looking on tire companies web sites they all say to use the manufacturers numbers. No surprise because saying anything different invites a lawsuit with zero upside. The wear bars are explained but theres nothing about those triangles except that they point at the wear bars.

I'd like to understand the what and why of street tire pressure and wear - my tiny dog brain imagines its simply car weight and tire patch area so sidewall doesn't matter except when cornering. But maybe its complex stuff. Maybe its a case where everyone just 'X around and find out' and then community develops a consensus.

Will say these new tires 'handle' unbelievably well compared to anything I've had before. They have transformed the car. I guess I should play with pressure but right now I don't want to mess with a good thing.

[Tonger]

I'm also needing a new set of tires on 7 and 9's. Has anyone tried these reissued small batch Michelins?

https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=SX+MXX3&frontTire=055YR6MXX3SX&rearTire=445YR6MXX3SX&vehicleSearch=true&fromCompare1=yes&autoMake=Porsche&autoYear=1986&autoModel=911%20Turbo%20Coupe&autoModClar=

[mark houghton]

Originally Posted by zakthor

I'm driving stock 7 and 8 and my car is heavier. Tire calculator says I would drop 2psi if I switched to 8 & 9 on my car. Right now the tires feel sticky and the turn in is so hard that I can't tell what the tires are doing. Really feels like rails but my critical mind says the limit must be close.



Close enough. Aren't you running bigger tires than me?

But...

Question Mr. Merk raises is about this tire and its stiff sidewalls.

For autocross I can look at tire temps but for street driving my primary goal is tire life. I just don't know how to adjust pressure for a particular tire, especially because these are so sticky.

I go looking on tire companies web sites they all say to use the manufacturers numbers. No surprise because saying anything different invites a lawsuit with zero upside. The wear bars are explained but theres nothing about those triangles except that they point at the wear bars.

I'd like to understand the what and why of street tire pressure and wear - my tiny dog brain imagines its simply car weight and tire patch area so sidewall doesn't matter except when cornering. But maybe its complex stuff. Maybe its a case where everyone just 'X around and find out' and then community develops a consensus.

Will say these new tires 'handle' unbelievably well compared to anything I've had before. They have transformed the car. I guess I should play with pressure but right now I don't want to mess with a good thing.

One technique I've heard of but never tried: Draw a thick chalk line across the tire tread and drive for a couple hundred feet, then look to see how even the line is worn away.

[Bucketlist]

Originally Posted by Tonger

I'm also needing a new set of tires on 7 and 9's. Has anyone tried these reissued small batch Michelins?

https://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=SX+MXX3&frontTire=055YR6MXX3SX&rearTire=445YR6MXX3SX&vehicleSearch=true&fromCompare1=yes&autoMake=Porsche&autoYear=1986&autoModel=911%20Turbo%20Coupe&autoModClar=

These sound like a great option, I have always been a Michelin fan since a stint selling tires years ago. I don't see anything offered close to my old outlaw on 245/40/17 & 275/45/17. I would like to replace my old Pirelli in these sizes on my current 7s & 9s.

[911 Rod]

Are you using the same 7's that came on the rear of a stock 911?

[myamoto1]

Refreshing this thread as I'm struggling to find much short of a track tire or a classic $450 per tire options. Looking for the 225/50/R16 & 245/45/R16 combo. I can go a bit wider on the back tires, but I'm in an M491, so don't have the power to spin oversized tires. I do have a set of 9 & 11 rims as well, but available sidewall sizes tend to suck acceleration.

[bpu699]

Subscribed…

Where are folks buying tires? Tire rack used to have tons of choices, now very little.

Only Bridgestone potenza sports show up for stock sizes…

The only 17 inch wheels that seem reasonably priced are the imitation Fuchs… but they seem rather unattractive in the 17 inch size as the face protrudes out with a lip…

I would love to buy the 16 inch Fuchs, but there’s almost zero tire choices….

[myamoto1]

bpu - agreed. About a year ago, I had thought about dropping down to 15 inch wheels as I'm not typically sliding sideways through the corners, so the look outweighed the taller sidewall. However, it seems that the 15 inch tire options have also dried up. If anyone is looking for a set of HRE 9 & 11s (I believe they're the HRE 540), I might be giving up on those as well as I can only find the Conti Extreme Contact in the 275/35r17 size that will keep me near stock ratios.

[bpu699]

So what wheels are folks buying??? I don’t see any size that has a reasonable tire selection. You can still barely get 16 inch sizes now, but 10 years from now???

I just can’t see spending $6000+ on wheels…

[Tonger]

Originally Posted by myamoto1

Refreshing this thread as I'm struggling to find much short of a track tire or a classic $450 per tire options. Looking for the 225/50/R16 & 245/45/R16 combo. I can go a bit wider on the back tires, but I'm in an M491, so don't have the power to spin oversized tires. I do have a set of 9 & 11 rims as well, but available sidewall sizes tend to suck acceleration.

I have the standard 7/9 16 inch wheels and used to run autocross tires. I have switched to the Michelin Classics and they are very nice (except price as you've noted). The tires are very smooth and grip well.

Selfishly, I hope more people buy them so that they don't 'go away'....

[911 Rod]

I'm considering going back to my 6/7" FUCH.

[Mr. Merk]

Originally Posted by myamoto1

I'm struggling to find much short of a track tire or a classic $450 per tire options. Looking for the 225/50/R16 & 245/45/R16 combo.

I would only run those sizes if you have 8's in the front. I ran MANY sets of 225/45 and 245/45 for years on 8s & 9s. The 225 doesn't feel good on a 7" wheel.

Originally Posted by bpu699

Tire rack used to have tons of choices, now very little.

Only Bridgestone potenza sports show up for stock sizes…

Originally Posted by bpu699

I don’t see any size that has a reasonable tire selection.

I don't understand what you guys are complaining about. How many tires can a guy run at one time?

TireRack has 7 options in stock, as low as $750 a set for a 300 treadwear tire. What more do you want?!

The most expensive option is only $1400 a set. That's a drop in the bucket compared to tires for a newer model.

If you're looking for an all-season tire for sub 40F driving, get the Conti DWS06+ in "Carrera" sizes. I've been running them on 8's & 9's and they are plenty wide and don't look stretched.

[myamoto1]

I think that's possibly my issue... I've always run the 225 up front for the past 20yrs and never considered dropping down to a 205. That does open up a ton more options.

It was 42 this morning on my drive into work, so thanks for the recommendation on the Conti's!

[WonkoTheSane]

I was browsing TireRack the other day for 15" tires and saw a brand I'm not familiar with. They seem fairly decent with overall positive feedback from the quick web searching on them I did. Only downside I see is they don't have a lot of sidewall to them. They go from 195 all the way to 305 in the 15" diameter selection. Oddly only 1 choice, 205/45, in the 16" selection.

https://www.tirerack.com/tires/vitour-tempesta-p1-p-01r