max rear tires for 718s - Porsche 718 Forum
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post #1 of 14 Old 04-19-2019, 10:06 PM Thread Starter
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max rear tires for 718s

hi i recently got a set of new wheels. i got a good deal on some volk te37 ultras.
the specs are

Front 19◊8.5 offset 52
Rear 19◊11 offset 53

im trying to get a set of tires for autox. i was leaning towards a set of re71r. the problem is that the sizes for the rear are on 285/35/19 or 305/30/19. i was wondering if the 285 will be to stretched of should i go with the 305? will the 305 have clearance issues? for the front i was looking into 255. will going for 265 have better balance for the 305?

thanks in advance
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post #2 of 14 Old 04-20-2019, 04:37 AM
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David Lemmens is running 991 Carrera S IV wheels, which are 11.5" ET56, with 305 tyres and apparently has no issues: https://www.718forum.com/forum/new-m...-gt4-wing.html so 11" ET53 should work.

Last edited by 982CS; 04-20-2019 at 04:44 AM.
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post #3 of 14 Old 04-21-2019, 01:29 AM Thread Starter
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sweet exactly the information i was looking for. is 3mm space for the rear strut enough?
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post #4 of 14 Old 04-21-2019, 03:38 AM
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David's rims are 11.5" so you should in theory have around 13mm between the strut and rim based on an offset of ET53 (compared to his ET56). However your proposed tyres are the same width, so your tyre will stick out from the rim further than his. As the offset is 3mm different, the back of your tyre should be 3mm further away from the strut than his, but conversely 3mm closer to the wheel arch on the outside - assuming tyres of identical width.
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post #5 of 14 Old 04-21-2019, 05:23 PM
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Quote:
Originally Posted by whitelies718 View Post
hi i recently got a set of new wheels. i got a good deal on some volk te37 ultras.
the specs are

Front 19◊8.5 offset 52
Rear 19◊11 offset 53

im trying to get a set of tires for autox. i was leaning towards a set of re71r. the problem is that the sizes for the rear are on 285/35/19 or 305/30/19. i was wondering if the 285 will be to stretched of should i go with the 305? will the 305 have clearance issues? for the front i was looking into 255. will going for 265 have better balance for the 305?

thanks in advance
Quote:
Originally Posted by 982CS View Post
David Lemmens is running 991 Carrera S IV wheels, which are 11.5" ET56, with 305 tyres and apparently has no issues: https://www.718forum.com/forum/new-m...-gt4-wing.html so 11" ET53 should work.
I think the 19" x 11" et 53 rear wheel is going to contact the lower track rod. You probably need a ~10mm spacer for it to work. Test fit these rear wheels (without tires) before you decide which rear tire size is going to fit.

Quote:
Originally Posted by whitelies718 View Post
sweet exactly the information i was looking for. is 3mm space for the rear strut enough?
Quote:
Originally Posted by 982CS View Post
David's rims are 11.5" so you should in theory have around 13mm between the strut and rim based on an offset of ET53 (compared to his ET56). However your proposed tyres are the same width, so your tyre will stick out from the rim further than his. As the offset is 3mm different, the back of your tyre should be 3mm further away from the strut than his, but conversely 3mm closer to the wheel arch on the outside - assuming tyres of identical width.
I think you'll find that the problem is the wheel, not the tire. A 20" wheel is big enough to fit over the lower track rod end but a 19" is not, thus the need for a spacer. With the spacer a 305 is probably gonna stick out too far, a 285 might work. Good luck! Let us know how you make out
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post #6 of 14 Old 04-21-2019, 06:05 PM Thread Starter
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ok will do a test fit as soon i get the wheels on wed.
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post #7 of 14 Old 05-01-2019, 02:12 AM Thread Starter
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Just did the test fit the rear strut is hitting. Pics attached. Wondering how 11.5 fit. If i add a spacer the wheel might stick out to much. It did clear the bottom rod.
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post #8 of 14 Old 05-01-2019, 03:04 AM
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Your rear toe link clearance is no bueno. It will hit your rim with any flex during cornering. I run 19 x 11 et 50 and it takes a 7mm spacer to adequately clear the rear toe link and strut.

Peter
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post #9 of 14 Old 05-01-2019, 04:54 AM
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As Jerry mentioned above, the problem is the diameter at 19", not so much the offset. Go 20" and it solves all your problems or 19 x 10".

David Lemmens car had Carrera S IV wheels 11.5 J x 20 ET56 305/30 on the back. I think the angle of the strut gives you a little more room with the taller rims.

2019 Cayman GTS GT Silver
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post #10 of 14 Old 05-01-2019, 10:24 AM
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Just for reference, I run Front 255/35/19 on HRE FF01 19x8.5 ET50 and 285/35/19 on Rear 19x10 ET40 without any rubbing or clearance issues on my GTS.
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