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 Ask my anything about tires, I am a tire engineer

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6UE5T
post Aug 25 2022, 01:35 PM

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QUOTE(AhMoon @ Aug 25 2022, 10:49 AM)
Is Hankook a good or reliable brand tire? Because for about additional RM50 I can get Continental, I mean is it worth paying the additional RM50? Looking to change all 4 tires at one go, so I am looking at additional RM200 here. Hankook 17" around RM350 while Continental 17" is RM400.
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Yes, Hankook is a good brand, the best of the Korean tires and often gives top brands a run for their money. Since few years back, Tirereviews UK actually already categorized Hankook as premium brand. Which Hankook and which Continental models are you comparing though?
6UE5T
post Sep 23 2022, 12:47 PM

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QUOTE(epjx31 @ Sep 22 2022, 12:07 PM)
There is a good comparison here

https://www.tyrereviews.com/Article/2022-Ty...r-Tyre-Test.htm

Giti is a Singaporean brand, could be manufactured in Germany but it's not a German tire. If you look closely it's s not even close when it comes to wet and dry performances. smile.gif

I think the only drawback is ps5 prices which is always the case for Michelin tire and they know it.
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As Jonathan himself has always mentioned, cheap tires are cheap for a reason.
6UE5T
post Oct 11 2022, 10:59 PM

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QUOTE(surianti @ Oct 11 2022, 06:30 PM)
Is it really necessary to change the inflation stem (for filling air) when changing tyres? I used to have good looking golden shiny stems but the tyre shop that changes the tyres always insist they are giving me new stems, but thise stems looks nothing like a new stem. They lookslike used stems with chipped and jagged edges, lost its metal shine and seems heavily rusted or oxidised. What do they make out of changing out my stems and putting in these used stems?
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That's just their way of trying to milk customers for more money! Those valve stems are dirt cheap in shopee yet they sell 3-4x more expensive at tire shops. I never change them unless really leaking.
6UE5T
post Oct 12 2022, 12:20 PM

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QUOTE(surianti @ Oct 12 2022, 12:04 PM)
What I don't quite get still is that while giving me used stem valve they are making it seems like they're giving free new valve stems. They mentioned this specifically to me and the tyre price doesn't reflect this valve stem in the receipt. They make it seem like part of the freebies for new tyres "we're also changing new valve stems for the tyres you bought". So I hazard a guess that they're swapping out good valve stems to be later used to fit in to customers with more serious valve stem problems? While giving away probably used valve stems that could be having problems to new tyre buying customers?
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Hmm never encountered such practice from tyre sellers. Usually they'd ask if want to change bla2, but surely pay more. If not then they won't open/swap the stems.

Actually the valve stems itself very seldom broken. The possible leaking is just from the rubber O-ring that sits/seals the stems into the rims.
6UE5T
post Oct 14 2022, 12:13 AM

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QUOTE(smallchicken88 @ Oct 12 2022, 11:04 PM)
1) Is the tyre pressure on the door jamb the MINIMUM recommended pressure when the tyres are cold? My car states 235kPa for front & rear

2) I read that altering the tyre pressure slightly can affect the handling profile, e.g. increasing pressure at the front to reduce understeer, decreasing pressure at the rear to increase oversteer

Would it be safe for me to have the front at 240 & rear at 225 to reduce understeer or 245/250 & 235 if the pressure on the door jamb is indeed the minimum?
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1. No, not minimum. It's just a general guide for target cold pressure but not necessarily the most suitable for each driver. Some may prefer harder or softer or same.

2. It will alter handling but not as simple as that. Increasing at the front pass certain level can actually give more understeer as the car loses grip cuz the front tires become too stiff hence less contact patch and capability to absorb the road granularity. Reducing the rear up to some degree would actually improve grip hence reduce oversteer/induce understeer but if reduce pass certain level then the tires will be too wobbly hence you'd have more oversteer tendency/instability. So in summary, you just have to test incrementally in either direction until you find the best combo that matches your driving preference.

This post has been edited by 6UE5T: Oct 14 2022, 12:14 AM
6UE5T
post Oct 21 2022, 02:35 PM

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QUOTE(kelvin0207 @ Oct 21 2022, 12:32 AM)
Recently I swap my front & rear tyres, however last week when I driving after rain and on downhill turn my car was slipped from right land to left lane

I been driving for so many years and this first time happened, I'm doubt is this due to tyre problem? I went to workshop and checked my car everything ok. The tyres are bridgestone techno 195/55/15.
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Probably got more water on the road so you aquaplane more.

QUOTE(e-lite @ Oct 21 2022, 11:44 AM)
Not asking anything but a trend that I noticed epjx31

Big name brands launching tyres that are catered to the budget friendly group or competing against the China tyres. They are forgoing using more expensive materials like silica to improve long mileage and wet performance, in order to reduce selling price and cater to a budget friendly crowd.

Seems like tyre technology and R&D have peaked, where engineers are purposely engineering lousier performance in order to get cheap selling price and maintain profits.

Of course this is outside of the realm of tyres used for hypercars and f1
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They won't do that to their UHP category tires though cuz those are their flagships. They could do that for the low end econo models.
6UE5T
post Jan 18 2023, 11:57 AM

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QUOTE(amscouzach57 @ Jan 17 2023, 07:04 PM)
Continental UC7 should have that size, right?

What about Yokohama Advan Apex V601? This tyre was reviewed to be a "quiet tyre" even though it is an Extreme Performance tyre. It was reviewed to be quieter than Michelin PS4
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V601 is still UHP like PS4. AD08/9R and A052 then are extreme. Anyway this V601 seems excellent in performance for UHP at least in the dry cuz I got a friend using on his 86 and it performs well on touges.

This post has been edited by 6UE5T: Jan 18 2023, 11:59 AM
6UE5T
post Jan 18 2023, 04:22 PM

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QUOTE(amscouzach57 @ Jan 18 2023, 12:47 PM)
This tire is cheaper than Falken FK510 now. About rm100 per piece cheaper for 19 inch size.

Planning to change to this from my current FK510.
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Oh really? Fk510 must have been increasing all the time. This tire should be more sporty than Fk510.
6UE5T
post Jan 19 2023, 08:56 AM

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QUOTE(teslaman @ Jan 18 2023, 06:06 PM)
Cheap china tyre good reliable or not?
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As the famous tire pro Jonathan from TireReviews UK says, "Cheap tires are cheap for a reason."

QUOTE(teslaman @ Jan 18 2023, 06:21 PM)
cheap china tyre at 1/2 price against good tyre normal price

but get 2x tyre change as compare to good tyre

i believe more frequent service is better than extended use of single tyle

but u the expert
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No, absolutely not! I'd rather use a Michelin PS4 at 50% tread than a brand new cheapo China tires, seriously!

 

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