Need to replace tires. Considering Hankook evo2's. They make exact size for front but not exact size for rear.

Stock rear is 295/30/20 with 101y load rating. Hankook does not make that size in Evo2 but does make. 285/30/20 with 99 load rating. I know the Hankook will be 10 mm narrower, but does anyone know if the load rating makes the tire unacceptable for a basic daily driver?

 

Would never go smaller. Do they make a 305? They'll fit, I'm running 255's on the front and 305's on the rear.

 

No 305. 285 is the widest they make in the evo2.

 

Reducing the load rating is not good. Even for a daily driver, you could get into an emergency situation where a tire could fail due to an extreme maneuver. Also I don't know what position your insurance company might take if an accident was the result of a lower rated tire. You have a $100K+ car, it's worth getting the correct tires.

 

Load rating on such a light car?
Hardly a concern.
Still, I would not go narrower on the rear tire.
The V12 is not that special to be worth downsizing for.
The PZero are a great tire, so not too much to gain by changing to anything else.
PSS do last longer, but not so sure they perform better.

 

Sorry, but I strongly disagree! If it was hardly a concern then why did Porsche, one of, if not, the best engineering company in the automotive industry, specify the load rating they did? Porsche doesn't do ANYTHING without good, sound engineering reasoning!

 

Did Porsche specify a Load Rating? or did they specify a Tire (that happens to have a load rating)?
Every size tire has a different load rating. There are multiple rear tire sizes used on the 991 and all are able to handle the load.
285-35-19, 295-30-20, 305-30-20

Its common sense that if bigger heavier cars (able to carry 4+ passengers and cargo) use 285-30-20 tires then a light 991 wont have a load problem.

Porsche picked the tire sizes for handling balance and there is plenty of load reserve in those tire sizes.
Feel free to check the weight capacity of that load rating and you will see it is more than ample.
However, since 991 is tail happy I advise not downsizing the rear tire (for handling balance reasons).

As for sound engineering, you have to admit 20" tires were chosen more for looks than valid engineering reasons.

 

This, why cheap out on tires for your 911? Boggles the mind.

 

You're looking at this from a very narrow perspective. First off, Porsche spends extensive time and money testing tires for there cars. So much that they only officially approve certain tires, IE."N" rated tires are built to Porsche specs. Secondly, yes, your correct when you ONLY consider the weight of the vehicle and whatever load it's carrying. But you fail to take into consideration the high G loads every Porsche is capable of. Those G loads could the be seen in the emergency situations I referred to in my original response to the OP.

Agreed, it was largely a marketing or design decision, but not entirely true as far as engineering. The larger wheel allows a stiffer sidewall and a marginally bigger contact patch. Just like the current fade to go +1 or +2 in tire size while maintaining the original overall diameter. Porsche just did it at the factory and designed the suspension to work with the larger tire sizes. It's all a balancing act and changing anything to something less than original strength is never a good idea. Your life or the $100K+ car you own could pay the price.

 

It amazes me some people try to literally "reinvent the wheel" when it's already been done!

Don't mess with a good thing!

 

Yep. No offence but if you really need to save the $300 or whatever you shouldn't be driving a 911 in the first place. The Ventus V12 Evo is a fine tire (I had a set on a BMW in the past) but not something I'd consider for a Porsche.

 

First off the Hankook Ventus tire is garbage next to the PZero or the Mich PSS. Not to mention it is a terrible idea to mix tire/brands on a car.

Second, a 285/30/20 tire max recommended width for the wheel is 10.5". You are just asking for issues...

To be frank I would go on Ebay looking for a used tire with 6 to 7/32nds left on the tire at $150.00 a pop before I put a set o f Ventus tires on my 991.


Dave

 

Funny, I went through two sets of Ventus (V12s) on my 993 and loved them. Super grippy and very, very quiet for a high performance tire.

 

Would you use them on your 991S? I had them as well and the sidewall is ridiculously soft. I was in a spot as I am running M3 GTS sizes on my M3 with the ZCP package (255/35/19 and 285/30/19). No Mich PSS in this size so I tried a multitude of tire options in these sizes. I found the Hankooks equal or in fact a tad less than the Nitto Invos. They are OK for a street tire but would never own again on my own cars.

This is forgetting the fact that the tire size the OP listed is not recommended by the manufacturer for the width of the wheel and mixing tire brands front and rear.

 

Nah, I agree with you. If they don't have a compatible size based on Porsche reco's then I won't be taking any chances on my 991S either.