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Need help with offsets

 
Old 05-04-2019, 01:27 PM
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Jack F
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Default Need help with offsets

Iím hoping you guys can chime in with some recommendations. I need a winter wheel set for my 2019 4 GTS. Clearly not now but I want to start looking at options. The factory centerlock wheels have the following specs

9x20 ET51 245 35 20
12x20 ET63 305 30 20

Option 1:
Porsche offers a factory assembled winter wheelset with TPMS for the GTS according to Suncoastparts.com. Here are the specs

8.5x20 ET51 245 35 20.
According to online offset calculator, this would increase the inner clearance by 6mm and retract the outer clearance by 6mm.
11x20 ET59 295 30 20
According to online offset calculator, this would increase the inner clearance by 17mm and retract the outer clearance by 9mm.

Option 2:
Pre owned 2017 Turbo S wheelset. Here are the specs.

9x20 ET51 245 35 20 (Tire size currently mounted)
Inner and outer clearance would remain unchanged.
11.5x20 ET56 305 30 20 (Tires size currently mounted)
According to online offset calculator, this would increase the inner clearance by 13mm and extend the outer clearance by 1mm.

Option 3:
Same centerlock wheelset as delivered with the he car so there would be no offset differences.

What do you think is a better option? Iím not sure what winter tires would be appropriate but I have seen 295 and 305.

Thanks in advance for the help.
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Old 05-04-2019, 01:34 PM
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Aatish
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All should be fine, though I'd confirm if any interference due to RAS (if you have it).

I'd suggest going 19s instead of 20s for winters, but that's my preference.

You'll have good tire choice for either size and width.

From the 3 choices you stated, I'd go Turbo S wheel set. But i'd need the details before making a final choice.
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Old 05-04-2019, 01:48 PM
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JSETarga
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The stock wheels are 3k new each so I would not choose that option unless you just have a lot of cash or found some used. I would buy the used turbo s wheels or an aftermarket set.
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Old 05-04-2019, 06:21 PM
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Jack F
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Originally Posted by Aatish View Post
All should be fine, though I'd confirm if any interference due to RAS (if you have it).

I'd suggest going 19s instead of 20s for winters, but that's my preference.

You'll have good tire choice for either size and width.

From the 3 choices you stated, I'd go Turbo S wheel set. But i'd need the details before making a final choice.
No RAS on my car.

I didn't know that Porsche made 19" centerlock wheels. No showed up on the suncoast parts site.
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Old 05-04-2019, 06:39 PM
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Jack F
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Michelin makes 245 35 20 N1 and 295 30 20 N1 and Pirelli makes 245 35 20 N0 and 295 30 20 N0 winter tires. Both have Porsche designation. What's the difference in the N0 and N1 designation? Will the 295 fit OK on 11.5 wide wheel? Would the 295 tire fit OK on a 12" wide wheel? Thanks again.
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Old 05-04-2019, 07:10 PM
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Ok, well I went through the exact same thing as you and decided on Turbo S wheels. They are exactly what Porsche recommends and I didn't want to risk putting on and removing tires twice a year from my factory rims. That being said, I now have HRE wheels, Factory Black wheel and the Turbo S wheel set up. If you want my Turbo S wheels let me know. I now plan on using my stock Black OEM wheels for my winter set up, but only because I have the Aftermarket HRE wheels as my summer set. If you plan on changing your primary wheels then use the stock ones for Winter set up. If you dont want to go aftermarket, then the Turbo S wheels are really the best option.
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Old 05-05-2019, 10:35 AM
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windblow
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Originally Posted by Jack F View Post
No RAS on my car.

I didn't know that Porsche made 19" centerlock wheels. No showed up on the suncoast parts site.
You can only get 19" aftermarket centerlock wheels. I'd go with option 2 Turbo S wheels using 295 winter tires. They have the right offset. Option 3 using 12" width stock rims would stretch the 295 winter tires too much. Option 1 rear offset is too recessed and doesn't look right.
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Old 05-05-2019, 01:35 PM
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Jack F
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I was looking at winter tire options on tire rack.com and saw this warning. Do they feel this tire size would be getting stretched on a 11.5” wheel? Same warning for Michelin and Pirelli winter tires.

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Old 05-05-2019, 01:46 PM
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Go to tire rack and get a complete setup for a very affordable cost. Have them mounted and balanced and ready to use.
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Old 05-05-2019, 02:46 PM
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Jack F
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Originally Posted by NJ991 View Post
Go to tire rack and get a complete setup for a very affordable cost. Have them mounted and balanced and ready to use.
Not many options for center lock wheels there and I donít really care for them. Buying a gently used Porsche centerlock wheel set at a fair price results in almost the same price.
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Old 05-07-2019, 05:56 PM
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Originally Posted by Jack F View Post
Not many options for center lock wheels there and I donít really care for them. Buying a gently used Porsche centerlock wheel set at a fair price results in almost the same price.
What does a gently used Porsche centerlock wheel set at a fair price go for?
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