03-21-2017, 04:32 PM
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#1
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Ideal Tire Size
What do you think is the perfect tire size for street performance on
Turbo Twists 18" Front 7.5 ET45 and Rear 9" ET52
I am upgrading from 17" to 18"s this summer and am looking for the perfect style, look, balance and street performance. Probably will get either BFG or Michelen Summer Tires
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03-21-2017, 06:10 PM
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#2
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Multi-Boxer Driver
Join Date: Nov 2010
Location: Orange Park, FL
Posts: 1,417
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Front: 225/40/18
Rear: 265/35/18
Those are the OE sizes for 18" wheels.
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2004 Porsche Boxster 2.7 (gone  )
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2017 Subaru Outback 3.6R
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03-22-2017, 04:44 AM
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#3
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Registered User
Join Date: Jul 2014
Location: Canada
Posts: 487
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Quote:
Originally Posted by Ciao
What do you think is the perfect tire size for street performance on
Turbo Twists 18" Front 7.5 ET45 and Rear 9" ET52
I am upgrading from 17" to 18"s this summer and am looking for the perfect style, look, balance and street performance. Probably will get either BFG or Michelen Summer Tires
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Take a look at the Firestone Indy`s before you buy. I run 18`s 225/40 265/35 .Really like them. Quiet and good in the wet.Nice price too.
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99 Boxster sold
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03-22-2017, 08:57 AM
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#4
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,796
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For "street" performance tires look at Pilot SuperSports. Not low cost, but simply a great tire. For lower cost options, Sumitomo HTR ZIII and Hankook Ventus V12
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
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2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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03-22-2017, 09:31 AM
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#5
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by Ciao
What do you think is the perfect tire size for street performance on
Turbo Twists 18" Front 7.5 ET45 and Rear 9" ET52
I am upgrading from 17" to 18"s this summer and am looking for the perfect style, look, balance and street performance. Probably will get either BFG or Michelen Summer Tires
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Front: 235/40/18
Rear: 265/35/18
Is what I run to minimize understeer, the 235 fits fine on OE wheels which have ET 50 offset
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03-22-2017, 12:32 PM
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#6
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,796
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You need to be a little careful with 235 on the front, it can rub the fender liner at full lock
depends a bit on what actual tire you use. Check the diameters and see where you are
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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03-22-2017, 01:30 PM
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#7
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1997 Tip, 2018 Macan
Join Date: Aug 2015
Location: Upland, CA
Posts: 1,338
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Quote:
Originally Posted by JayG
For "street" performance tires look at Hankook Ventus V12
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I put the Hankooks on +/- 8 weeks ago. Very pleased with them and paid $630 all in.
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03-22-2017, 01:32 PM
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#8
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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What is the "Ideal" tire size???? Well what the engineers put on the sticker under the hood of course. Personal preference may vary.
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03-22-2017, 05:12 PM
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#9
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Quote:
Originally Posted by 911monty
What is the "Ideal" tire size???? Well what the engineers put on the sticker under the hood of course. Personal preference may vary.
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The manufacturers put the most economical; I'm seeking inputs from a variety of perspectives vs "personal preference" from engineers.
Inputs from everyone have been informative.
Cheers
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5280 Cruising @High Altitude
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03-22-2017, 05:23 PM
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#10
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Quote:
Originally Posted by Ciao
The manufacturers put the most economical; I'm seeking inputs from a variety of perspectives vs "personal preference" from engineers.
Inputs from everyone have been informative.
Cheers
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Ummm. No. Porsche engineers choose tires based on desired handling and safety for the masses such as desired understeer characteristics. Porsches engineers even specify N spec tires to obtain these ratings, which may be overkill for some personal preferences. I'm not saying a manufacturer such as KIA doesn't choose the cheapest (economical) but Porsche engineers have certain performance objectives in mind when they specify sizes. If you read the post above concerning the 235 tread width it is done for personal preference which is a desire to tune out a little of the understeer.
Last edited by 911monty; 03-22-2017 at 09:59 PM.
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03-22-2017, 09:44 PM
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#11
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,796
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You do need to look at actual tread width. It varies a lot from tire to tire.
You can have 225's that are actually wider than 235's
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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03-23-2017, 05:55 AM
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#12
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Quote:
Originally Posted by 911monty
Ummm. No. Porsche engineers choose tires based on desired handling and safety for the masses such as desired understeer characteristics. Porsches engineers even specify N spec tires to obtain these ratings, which may be overkill for some personal preferences. I'm not saying a manufacturer such as KIA doesn't choose the cheapest (economical) but Porsche engineers have certain performance objectives in mind when they specify sizes. If you read the post above concerning the 235 tread width it is done for personal preference which is a desire to tune out a little of the understeer.
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Sure, and Continental's will suit that need for German vehicles at a cheaper cost than Michelens which are more popular on the performance aspects which many indorse.
Under steer is not all negative either ...
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