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 Ask my anything about tires, I am a tire engineer

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TSepjx31
post Dec 30 2022, 12:27 PM

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QUOTE(kennykck @ Dec 30 2022, 12:17 PM)
better beware, feels totally off

Current price for 175/65R14 CC6 RM 165 x 4 = RM 660

What lim tayar is offering 3 + 1 = RM 690 sad.gif

So their original price is = RM 920 which is crazy high

This post has been edited by epjx31: Dec 30 2022, 12:27 PM
TSepjx31
post Dec 30 2022, 10:36 PM

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QUOTE(kennykck @ Dec 30 2022, 09:09 PM)
Is primacy 4st same spec like primacy 4 but more silent?
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4st is the Asia spec while 4 is the european spec. Not sure about the noise but it has to do with the local driving behaviour between Europe Vs Asia
TSepjx31
post Dec 31 2022, 11:28 AM

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QUOTE(lee82gx @ Dec 30 2022, 10:42 PM)
Thanks for replying.
i do absolutely value life over any sort of cost saving. so rear tyres it is.
my XM2 already about 4 years of service and they still have plenty of tread because i only drive in the city, 10km a day in heavy traffic and low speeds. i suppose i only want wet stopping power and grip.

while for the 215 55r16, may i ask if i were to compare between the michelin primacy 4st vs the Goodyear Assurance Triplemax 2, what do i gain for the RM100 extra...
i'm currently on Continental MC5, 1 year on and they provide a good ride, i'm just fortunate enough to never need to do heavy wet braking.
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No reason to change your XM2 If you have still a lot of tread.

I would say wet braking about 5% while having a slightly better mileage. How much tread depth is left on your MC5?
TSepjx31
post Jan 2 2023, 09:13 PM

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QUOTE(VeeJay @ Jan 1 2023, 07:58 PM)
Thanks bro. Yeah I didnt see much choice from your table. Currently Im using Bridgestone Dueler on my Sorento. But recently I see lesser and lesser reseller on that brand.

Recently was quoted as below:-
Toyo CR1 - RM510
Continental UC6 - 695
Hankook - 630
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UC6 for RM 685 for this size is a bargain. Is it on offer?
TSepjx31
post Jan 2 2023, 09:19 PM

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QUOTE(lowkelvin @ Jan 2 2023, 01:54 PM)
Hi epjx31,

My car is driven less (~5000km per year).
Now my car is 4 years and I think it's time to replace them with new

Here is my situation:
1. 1 total new (used, 4 years old) spare tyre 'sleep' inside my car boot
2. 2 Rear tyres are look healthy
3. 2 Front tyres should retired

I have low budget and here is what I'm planned to do
1. Replace 2 front tyres with new purchase tyres
2. Keep 1 one of my rear tyre, and exchange another rear tyre with my spare tyre

In this case, I will have 2 new tyres as my front tyres,
1 existing rear tyre, 1 unused old rear tyre,
and 1 used rear tyre as spare

May I know if this is possible? Thank you
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Hi there, thanks for writing such a detailed post.

First question is what is your tread depth of your tires. 4 year old tire should not be the reason to change tires.

Always replace new tires at the rear.

TSepjx31
post Jan 2 2023, 09:21 PM

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QUOTE(Buffalo Soldier @ Jan 2 2023, 02:07 PM)
For tire alignment, are there any differences for FWD, RWD, and AWD cars? Or all the same?

Sorry if its out of topic
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Sorry I'm not so sure about the alignment details but from an engineering guess it should be the same.
TSepjx31
post Jan 3 2023, 03:43 PM

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QUOTE(lowkelvin @ Jan 3 2023, 03:11 PM)
epjx31,

My questions are:
1. Can I keep using my rear tyre until tread depth become lower?
2. Is my front tyre should be replace asap?
3. If I should replace my front tyre, should I put my existing rear tyre as front tyre, and new tyre as rear? or directly replace front tyre?

Thank you very much
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1. The rear with 4mm looks fine.
2. The front tires with a straight rib crack looks awful bad. I am worried that this affects your stiffness --> wear + noise.

My professional recommendation. Change your front tires. Place the new set of tires at the rear & your old rear tires is place in the front now.

Rotate every 10,000 km to smoothen out your wear. Maybe after 2 cycles you should be aligned smile.gif
TSepjx31
post Jan 6 2023, 04:07 PM

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QUOTE(mick87 @ Jan 6 2023, 03:58 PM)
Ran over a rock on highway, got cut on the sidewall, been driving around for about 1k km, no leak or whatever. Should i continue to use it?
PS: This is RFT, made in 2019.
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You should change this immediately. This is safety issue.
TSepjx31
post Jan 7 2023, 07:44 AM

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QUOTE(HalseyFrangipane @ Jan 6 2023, 08:53 PM)
Tyres flex hard all the time while being driven. It will eventually be a problem
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Exactly
TSepjx31
post Jan 9 2023, 11:34 AM

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QUOTE(andrekua2 @ Jan 9 2023, 10:52 AM)
Personally I dont see a problem. You might as well go and got it patched (more like touch up). I also had a similar cut and I continue to drove like 3K. However mine was leaking all the time and I got fed up having to pump every week.

For me, tyre construction is more about the steel mesh and less about the rubber. Even when leaking, it does so really slowly instead of being punctured and losing all air in an instant. As long as the sidewall steel mesh is not compromised or deformed, I wouldnt worry too much.
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From a tire engineer stand point I tend to disagree.

The main load carrying component is the air which is stored inside the tire. When you have insufficient forces withholding your vehicle load, you create stresses at the sidewall's flexing area. When you go though small bumps, or pot holes this would exponentially magnified.

If the worse possible outcome is an accident, is it worth your $ ?
TSepjx31
post Jan 9 2023, 03:34 PM

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QUOTE(showcase @ Jan 9 2023, 01:09 PM)
Need some expert advise. Current tyre size is 205/60/R16. wanted to change 2 tyres but the model that I wanted don't have the same size (Conti MC6 has 205/45/R16, UC7 has 205/50/R16 or 205/65/R16). couldn't afford to change all 4 due to budget constraints (CNY is js around the corner).

Questions:
1) Will there be any problem if the tyres have different aspect ratio (eg. the 2 front tyres are MC6 205/45/R16 while the rear tyres remain the current size 205/60/R16)?

many thanks in advance
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Based on my price table

Name Tire Size Price(RM)
Toyo Nano Energy NE03 205/60R16 302
Continental UC6 205/60R16 (UC6) 407
Michelin Energy XM2+ 205/60R16 420
Michelin Primacy 4st 205/60R16 435

There is 4 options with your size. UC6 or XM2+ looks good smile.gif

I would not recommend to have different sizes due to varying outer diameter complications.
TSepjx31
post Jan 10 2023, 02:58 PM

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QUOTE(matkewl @ Jan 9 2023, 04:18 PM)
hi , is rovelo 225/55/18 is a good buy? its made in china. Montare HT RV
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Would really stay away from china tires. They do not provide value. They might bin good in one performance criteria but performs extremely bad in the other. Low target conflict management.
TSepjx31
post Jan 13 2023, 04:48 PM

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QUOTE(DSV4600 @ Jan 13 2023, 12:09 PM)
Thank you. Follow-up, wouldn't tread depth of 1.6 - 2.0 mm affect wet water breaking? Especially on highway driving, speeds above 90km/h.
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Yes wet braking is a function of tread depth as the void on the pattern helps you evacuate water.

The question is how bad your wet braking distance will be ?

You could see a quick comparison between the wet performances of a 1.6mm tread depth vs full tread depth tires

MICHELIN Primacy 4+ (new : 22,8m - worn : 31,5m) versus BRIDGESTONE TuranzaT005 (new : 22,6m - worn : 36,4m); CONTINENTAL PremiumContact 6 (new :23,1m - worn : 35,3m); GOODYEAR EfficientGrip Performance 2 (new : 23,8m - worn : 35,5m) competitors.

You loose about 10-14m or so. This is a huge difference especially when it comes to an emergency brake situation on wet.

Hence my advice is , please change your tires ! if not please be aware of the risk you are taking.


TSepjx31
post Jan 17 2023, 02:01 PM

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QUOTE(liverpoolboi @ Jan 17 2023, 01:42 PM)
Currently using Bridgestone Potenza, 225 40R 18..planning to change to a more quiter tyre if possible..

Any suggestions..and price range..

BTW using a C180 only..

Tq
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Based on my price table, here are some options.

Name Tire Size Price(RM)
Michelin Pilot Sport 4S 225/40R18 1110
Kumho Ecsta PS31 225/40R18 435
Yokohama Advan Fleva V701 225/40R18 475
Bridgestone Potenza Adrenalin RE004 225/40R18 479
Continental Max Contact 6 225/40R18 618
Michelin Pilot Sport 4 225/40R18 (NEW PS5) 835

Would say MC6 or PS5 is quiet. But those are easily +200/300 more
TSepjx31
post Jan 19 2023, 10:26 AM

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QUOTE(MISMan @ Jan 18 2023, 04:30 PM)
Hi TS,

Thank you for offering such a great service to the community!

I have a question:

Run Flat tyre - 18". My tyre picked up a screw at the sidewall and tyreshop said "it might explode when they try to pull it out (a new tyre may be needed"

Is that true on the statement above and what causes it to explode and not for ordinary tyre (non-run flat). Would u know why?

As i know, run flat tyre has thicker and tougher sidewall. He just pulled it out and didnt explode n yet he didnt bother to patch up the hole.

Thanks!
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Sidewall puncture is not recommended for repair as this area incurs the highest amount of stress during normal use. Hence sidewall damage is usually classified as unrepairable.

Just to clarify tires would not explode !!!!! It is not made out of explosives.

The cause of concern is when you are running the tire at high speed, a sudden lose of pressure would force your tire to rotate without sufficient support as air is not longer present to withstand the load. Hence this cause a big "show" as your tire will degrade badly due to the high forces being exerted on it.

Hope this helps
TSepjx31
post Jan 19 2023, 10:28 AM

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QUOTE(teslaman @ Jan 18 2023, 06:06 PM)
Cheap china tyre good reliable or not?
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reliable as in it will carry the load of the car, yes for sure.

but if you are looking for safety such as wet braking or value such as mileage, they are currently no where near what the mid or premium side.

Thanks.

TSepjx31
post Jan 20 2023, 09:41 AM

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QUOTE(Natsukashii @ Jan 19 2023, 07:10 PM)
Hi TS and tyre experts..

Can these tyres still be used?

2017.. mileage has been 30k.

user posted image

user posted image

user posted image
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Hi there,

Could you be so kind to measure the tread depth ? both center & shoulder.

Based on the pictures, I do not see any structural damages which means the tire is still well intact.

For me the bigger concern is how much tread depth is left. As previously stated, there is a huge difference in wet performances comparing low vs new tire. This is a risk you should understand.

What was the main concern from your side?

TSepjx31
post Jan 20 2023, 10:44 AM

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QUOTE(myroy @ Jan 20 2023, 09:51 AM)
I have already use conti CC6 twice
any recomendation for next change, that within same budget range?
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What are your main requirements? Noise ? Wet braking?
TSepjx31
post Jan 25 2023, 02:55 PM

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QUOTE(mdziaf @ Jan 20 2023, 08:43 PM)
Feel free to still use it. There's plenty of thread depth remaining (1.6mm is the minimum legal requirement). Changing at 2mm is also a good practice during the rainy season.

With regards to the shoulder looking like it is, this is not a cause of concern. Just the rubber aging.
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Agree with what @mdziaf said. Just be cautious during then rain. You should change once you feel that the risk is not worth anymore 😂😂😂
TSepjx31
post Jan 25 2023, 03:03 PM

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QUOTE(raulxiver @ Jan 23 2023, 10:40 PM)
Is this true? New tire perform best after 1 year from manufacturing date, as its chemicals take time to stabilized ?

Tire is not food, not the fresher the better!

https://www.linkedin.com/pulse/tire-food-mo...etter-rina-liu/
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To be honest, it's not something you should be concern off. There is some differences which can be measured only with "technical" equipment for us in the tire industry. Running in the tires is a common practice before any wet braking or winter performance test. I would always take fresh tires, as it has less oxidation and oil migration. 😂😂😂

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