Uploaded August 2022 | Updated September 2026, 2 weeks ago
Have you ever wondered what difference ticking the big wheel size option makes when specifying your new car? In this video I find out! I use a new Porsche 992 911 which comes standard with 19" front and 20" rear wheels, and test them against the optional 20" front and 21" rear wheels!
Both these wheel options use the new Michelin Pilot Sport 4S NA0 tire which is specifically designed for the 992 911. The standard tire sizes are 235/40 R19 front and 295/35 R20 rear and the optional big wheel size is 245/35 R20 front and 305/30 R21 rear.
As usual I test the braking performance in the dry and wet, dry lap time, wet lap time and look at the noise and comfort of the two different sets of wheels.
Does fitting big wheels to your car really ruin the handling? Do big wheels make you faster around a track? Only one way to find out! Lets get testing.
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Please review your tires at tire-reviews.com !
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The difference between 17, 18 and 19" wheels - tire-reviews.com/Article/The-differences-between-17-18-and-19-inch-tires.htm
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Follow me on instagram for all the latest tyre related updates: instagram.com/tyre_reviews
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00:00 Introduction
01:10 Noise and Comfort
01:32 Braking
03:20 Wet Handling
06:27 Dry Handling
11:06 Conclusion
Have you ever wondered what difference ticking the big wheel size option makes when specifying your new car? In this video I find out! I use a new Porsche 992 911 which comes standard with 19" front and 20" rear wheels, and test them against the optional 20" front and 21" rear wheels!
Both these wheel options use the new Michelin Pilot Sport 4S NA0 tire which is specifically designed for the 992 911. The standard tire sizes are 235/40 R19 front and 295/35 R20 rear and the optional big wheel size is 245/35 R20 front and 305/30 R21 rear.
As usual I test the braking performance in the dry and wet, dry lap time, wet lap time and look at the noise and comfort of the two different sets of wheels.
Does fitting big wheels to your car really ruin the handling? Do big wheels make you faster around a track? Only one way to find out! Lets get testing.
=======
Please review your tires at tire-reviews.com !
=======
The difference between 17, 18 and 19" wheels - tire-reviews.com/Article/The-differences-between-17-18-and-19-inch-tires.htm
=======
Follow me on instagram for all the latest tyre related updates: instagram.com/tyre_reviews
=======
00:00 Introduction
01:10 Noise and Comfort
01:32 Braking
03:20 Wet Handling
06:27 Dry Handling
11:06 Conclusion









![Are Modern Runflat Tires Finally Good? Normal, RFT and SEAL Tires Compared!
Runflat [RFT] tires have a bad reputation for low levels of comfort, being noisy, and poor grip especially in the wet. But how much of this is down to the fact the tire is a run flat tyre, and how much of it is down to it just being a bad tire?
To find out Im testing a normal regular car tire against a fourth generation runflat tire with exactly the same compound and tread pattern. This means the the only difference is that the runflat tire has the extra support in the sidewall.
Runflat tires are called different things by various manufacturers:
Hankook: Hankook Runflat System - HRS
Goodyear / Dunlop: RunOnFlat - RoF
Michelin: Zero Pressure - ZP
Bridgestone: DriveGuard
Continental: Self Sealing Reifen - SSR
Pirelli: Run Flat - R F
To make things even more interesting, Ive included a sealant tire, which is a normal tire with a complicated sealant material bonded to the inside which seals any small punctures the tire might get in the tread pattern.
As always Im testing the dry and wet grip of the three types of tires, and perhaps even more importantly, doing extensive noise and comfort testing to see if a modern run flat tyre is now more comfortable than the earlier versions.
I also test whether a sealant tire really can be punctured multiple times, and I test whether you really can run on a runflat tire for 80 kms at 80 km/h.
The tire used in this test is the Hankook Kinergy 4S2 all season tire - https://www.tyrereviews.com/Tyre/Hankook/Kinergy-4S2.htm
Please review your tires at www.tire-reviews.com !
Follow me on instagram for all the latest tyre related updates: https://www.instagram.com/tyre_reviews
Chapters
0:00 What is a runflat and seal tire?
1:31 Puncturing the SEAL tire. Does it work?
2:37 Dry Handling and Braking Testing
6:21 Wet Handling and Braking Testing
7:55 Noise and Comfort of Runflat vs Normal vs Seal Tires
10:44 Running a runflat deflated
14:17 Why you cant repair a runflat
15:01 Hydroplaning, Rolling Resistance, Wear and Price Information
15:46 Safety and Conclusion
Music by epidemicsound.com Are Modern Runflat Tires Finally Good? Normal, RFT and SEAL Tires Compared!](https://i.ytimg.com/vi/sTRn1E1uF6c/mqdefault.jpg)
