981 Odd feeling with wider 19 vs 20 Is this normal?
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Thread: Odd feeling with wider 19 vs 20 Is this normal?

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    Odd feeling with wider 19 vs 20 Is this normal?

    Hi

    so for the first few years on my 981 CS I ran stock Carrera classic 20" wheels. The car felt amazingly planted and smooth bother side to side and up and down. Even when I added 7mm and 14mm front/rear spacers. In general car felt super smooth over normal roads.

    Not too long long ago I switch to OZ Leggera HLT wheels 19". I went 10mm wider on front and back from stock and removed my spacers. At first slow speed around felt even more compliant. 19 vs 20. However what I've really noticed is that the car seems less stable. It feels more vertically bouncy to me. Less planted. And also even steering feels less smooth and precise. Even on freeway I feel like unless it's a perfectly smooth surface the steering wheel is moving and giving me way more feedback than normal. Like I have to really work to keep steering wheel more.

    I'm curious if anyone else has experienced this or has any thoughts. Tires were mounted and balanced by Tire Rackicon when purchased. And I had an alignment done at dealer after just to be sure.

    Edit: I'm running Michelin PSS which are great tires and I had on my 20s as well.

    Thanks
    michael
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Did Tire Rackicon road force balance your tires?

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    The tires and wheels were new from tirerack. They put it all together and balanced the wheels yes.
    Last edited by mcomet; 07-18-2017 at 11:14 PM.
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Did you change aspect ration 35 to 40? If so the feeling may result from the taller sidewall of the 19s versus the 20s.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Yes...here's a bit more info and also some things I noticed...especially curious to hear from those who have got the OZ wheels...

    First... yes to size

    PRIOR I was running stock Carrera Classic 20" 235 35Z R20 and 265 35Z R20. As mentioned with the spacers Front/Rear 7mm and 14mm

    NOW I am running OZ Leggera 19". I got 10mm wider tires. 245 40 R19 and 275 40 R19. I removed spacers, and set the computer to summer 19 size.

    I am using stock mounting bolts (the original ones, not the longer one I had for spacer usage).

    One thing I noticed and am curious about. When I mounted my new wheels I noticed the OZ wheels were a LOT harder to get on. What I mean is, the OEM wheels slide onto the hub, perfectly smooth, and right up to the inside. The OZ wheels went on but seemed to be somewhat tighter radius to get on there... so until I tightened them down with the torque wrench not really flush imo. In fact getting them off or on I have to use some force and sort of wiggle/angle the wheel. Compared to the stock wheels feels different. But I am assuming with the proper 118 ft lb of torque it is fine. They certainly haven't gone anywhere in over 500 miles.

    I ran my 20's usually near stock pressure of 33 psi. I believe for these R19's I am supposed to be at 30psi which is what I have been at altho I tried 33 originally.

    At slow speeds it's pretty much fine. But in general compared to before the car feels much less stable. I feel like there is a lot more bounce over bumps. Maybe that is just 19 vs 20 and sidewall. The more concerning issue to me is the side to side feeling I get on the steering wheel now. On freeway the other day I was trying to pay attention. There was just more "noise" and motion on the wheel than I ever had. Previously the car felt very 'digital' and smooth. Very little feedback from steering wheel unless something was happening. With the new setup I was feeling like there was small motion back and forth on the steering wheel left and right. Not so much I have to go crazy really holding but enough that I notice it and it feels different.

    My friend suggests taking my wheels somewhere to have the balance checked which is maybe a good idea.. I am curious to know if others had similar mounting fitment issues as well, or any other thoughts.

    Thanks!
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    I will try to answer some of the questions. The OZ wheels for the Porsche's are hub centric. I would suggest cleaning the hub of the car with a wire brush and then put some lube around the hub when you are putting the wheels on. This will make taking them on and off much easier.

    Secondly the PSI should be the same as stock. The OZ set up is not going to change anything. The factory torque specs should be followed.

    As far as having them balanced it does not sound like you are having a vibration issue so the road force balance is not going to do anything. I would say that the 19" wheel set up is much lighter than the stock wheel and tire so that could cause some more play because you have reduced unsprung weight. It should also make your car quicker and easier to brake at the limits. The 19" set up should also be more compliant and feel less of road imperfections. The wider tires may make the steering a little more difficult and the car may tramline a little more.

    I am not sure if any of these helps or not.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Jim thanks for the reply. I did clean what I could off the hub etc when I mounted them. Still felt different than OEM. As far as PSI my research led me to believe that the 20" tires had a 33 psi standard. And that 19" tires had a 30 psi. Tho maybe someone can confirm that for me. I should probably just look at how wear is progressing...

    Yeah I don't think its like a super crazy unbalance vibration... tramline-ing might be a good way to describe it... hrmm
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?


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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    A couple of things come to mind. The first is Tramlining. Google it. You went to a 10 mm wider tire and even though it is a higher profile It is probably still a high performance summer tire. So your now tracking the rain groves and irregulars in the road. Alignment by a specialist may help. Second, the high profile tires might indeed seem more bouncy. However, I'm wondering if also the new OZ are as light at the OEMs. Yes there smaller which would seem to be lighter but they are also wider and may or may not be forged. Check to see if you did not add wheel weight. Good luck.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    I am pretty sure the weight is less than the 20" OE set up. The OZ wheels are very light and strong.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    When I tried weighing both my wheels/tires combo when replacing on the car the weight seemed near identical. The OEM 20's were Cast BBS wheels I believe. These are FloFormed. Old wheels and stock tire size, vs new wheel, and wider tires..the weight was similar-ish within a few pounds as far as my crappy holding/floor scale could tell.
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    I'm very suprised. The OZ wheel is flowformed as well.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Just a follow up I took the car to work the other and out a bit today. I think I might just be noticing the better tires and different wheel size. I've had Michelin PSS before but most recently had Bridgestone Potenza on the 20s. Did not like those tires. Anyhow with the 19s now back to PSS definitely stickier. Add to that 10mm wider and I set camber more negative (still within porsche spec) and I am sure I increased tranlinkng.

    Which is what I have noticed. Most of he driving things felt normal and smooth. It really is just certain roads or areas. The bounce/suspension still feels different tho. Whether that is added or less weight I don't know. But I'm just gonna live with that. I almost feel like the car is lighter and will lift off ground more. That's the feeling anyhow.

    Thanks all.
    2016 Cayman 981 GT4 - Carrera White Metallic - Leather/Alcantara with Guard Red Stitching / etc...

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Quote Originally Posted by mcomet View Post
    Hi

    so for the first few years on my 981 CS I ran stock Carrera classic 20" wheels. The car felt amazingly planted and smooth bother side to side and up and down. Even when I added 7mm and 14mm front/rear spacers. In general car felt super smooth over normal roads.

    Not too long long ago I switch to OZ Leggera HLT wheels 19". I went 10mm wider on front and back from stock and removed my spacers. At first slow speed around felt even more compliant. 19 vs 20. However what I've really noticed is that the car seems less stable. It feels more vertically bouncy to me. Less planted. And also even steering feels less smooth and precise. Even on freeway I feel like unless it's a perfectly smooth surface the steering wheel is moving and giving me way more feedback than normal. Like I have to really work to keep steering wheel more.

    I'm curious if anyone else has experienced this or has any thoughts. Tires were mounted and balanced by Tire Rackicon when purchased. And I had an alignment done at dealer after just to be sure.

    Edit: I'm running Michelin PSS which are great tires and I had on my 20s as well.

    Thanks
    michael
    What you're likely feeling is a difference in sidewall height and sidewall geometry. 19" vs 20" means there's now an extra inch of rubber that was previously relatively inflexible metal. Brand new tires also means taller stickier tread blocks and more squirm vs the shorter tread blocks on your old heat-cycled tires. In other words, sounds like you're having a normal experience.

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    Maybe some weird hub centric spacer stuff. This is why I go BBS, OEM, HRE, etc.


    Sent from my iPhone using Tapatalk

    2015 981 Boxster 2.7L PDK, HRE FF01 20" Pilot Sport 4S, JRZ RS1 touring 330/300 springs, Cobb
    2010 Audi S4 6MT, Brembo GT-R 380mm, BBS CX-R Cup2, Recaro Spa, JRZ RS1 450/800 springs, Revo

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    Re: Odd feeling with wider 19 vs 20 Is this normal?

    He is not feeling vibrations. Centering rings are also German TUV approved so there are no issues in using them.

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