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 Ask my anything about tires, I am a tire engineer

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TSepjx31
post Nov 1 2022, 08:37 PM

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QUOTE(defanci @ Nov 1 2022, 01:58 PM)
Hi Pro,

Is it safe to drive with this tyre?

user posted image
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Looks like rim strip got peel off, with proper management you should be fine. Ensure you stay of any kerbs. Also regularly check your sidewall for damages. If you do the above, you should be fine.
TSepjx31
post Nov 2 2022, 08:43 PM

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QUOTE(mdziaf @ Nov 2 2022, 07:09 PM)
Just to add so that it answers your question directly:

The number indicates how much of that material is present. There are two places where this is checked and labelled:
1. The tread counts the number of material if you cut through the tire directly in the middle
2. The sidewall counts the number of material as you cut through the sidewall

So for example:
Tread: 1 polyester + 2 steel + 2 nylon
Sidewall 2 polyester
This means that there is 1 polyester body ply at the middle of the tire followed by 2 layers of steel belts and finally 2 layers of nylon cap material that is present at the center of the tire (from bottom to top)

At the sidewall there is 2 layers of body ply material. In this case it is the same ply material that is found at the center but wrapped around by the bead and runs up the sidewall.

Different tires will have different combination of body ply, and nylon cap depending on its speed rating and required performances. All car tires will have 2 layers of steel belts.
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Well said!

TSepjx31
post Nov 3 2022, 08:59 PM

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QUOTE(dkirk500 @ Nov 3 2022, 10:32 AM)
What are the best tires for 225/65/17 size wheels for a quiet driving experience?
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Michelin Primacy SUV. Is a good but expensive choice. Alternatively the new UC7 from continental is value for money.
TSepjx31
post Nov 12 2022, 06:31 PM

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QUOTE(barjoyai @ Nov 11 2022, 11:03 PM)
Hi there, looking for recommendation for 215/50/17. I've been using stock 215/45/17 on my 8 yr old car. Previously mc5 -> uc6 -> uc6 currently. I would want uc7 or uc6 again but price has been increased since before. I'm thinking to change to 215/50/17 for better comfort. Appreciate if anyone can recommend other options with similar performance or so as uc6 but at a budget of 1.2-1.4k max. Thanks again.
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Based on my price table , you have the following choices
Toyo Nano Energy NE03 215/50R17 356
Kumho Ecsta PS31 215/50R17 364
Goodyear EfficientGrip 215/50R17 368
Yokohama Advan Fleva V701 215/50R17 400
Goodyear Eagle F1 Sport 215/50R17 448
Continental Max Contact 6 215/50R17 460
Continental UC6 215/50R17 (NEW UC7) 480
Michelin Primacy 4st 215/50R17 540
Michelin Pilot Sport 4 215/50R17 (PS4) 590

Based on your budget requirement, Goodyear efficient grip is your best choice. Of course if I were to recommend what is the best choice, Michelin Primacy 4st would be my choice.

This post has been edited by epjx31: Nov 12 2022, 06:37 PM
TSepjx31
post Nov 12 2022, 06:39 PM

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QUOTE(dragon528 @ Nov 11 2022, 11:13 PM)
Hi, currently using GT Radial CHAMPIRO SX2 215/45R/17. Why is this tyre so noisy? Is it normal?
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Hmm is it a brand new tire? What is the remaining tread depth? Usually noise actually gets better when the tread depth is lower. Could be an irregular wear issue?

Could you state how the noise feel like? That could give me more hints
TSepjx31
post Nov 13 2022, 08:56 PM

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QUOTE(dragon528 @ Nov 13 2022, 02:03 PM)
I around 10 months old, probably 10K+ KM running. The more I use, the more noiser it getting I guess? Hard to describe, can say it echo so much like bearing problem sound but foreman checked, it not my bearing.
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Would be cool if can do a quick experiment. Change your spare tire or in fact any tire and see whether the sound still persists. Did the noise was present ever since you installed the tire?
TSepjx31
post Nov 24 2022, 07:32 PM

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QUOTE(OlgaC4 @ Nov 21 2022, 11:35 PM)
TS my car is coming to 13years now. It it worth it to install a new Michelin Primacy tyre?

Previously also using primacy tyre.
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For sure, I would definitely recommend to use the best wet braking tire on the market if you have the means.
TSepjx31
post Nov 29 2022, 02:26 PM

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QUOTE(chan01 @ Nov 29 2022, 07:33 AM)
Hi, my tyre start to peel near the texture area. Is it still safe to use? Thanks
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Could you show us a picture? That would really help.

Usually you would not want to risk anything near the sidewall as this is where the tire flexes smile.gif
TSepjx31
post Nov 30 2022, 02:28 PM

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QUOTE(chan01 @ Nov 30 2022, 11:46 AM)
Hi, thanks for the help. I already attach the picture. Thanks for your help and info. Appreaciate it 😀

user posted image
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Hi thanks for your picture.

It seems like this is a cup and chip issue. and it is on the shoulder area.

Based on my opinion, it should be still safe to drive. Just ensure you check your tire more often both visually and also the air pressure.


TSepjx31
post Nov 30 2022, 05:10 PM

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QUOTE(Wolgie @ Nov 30 2022, 04:18 PM)
Leao Tyres acceptable?

or what tyres recommend? Local?
Michellin or CC?
Axia 175/60R road in sabah not really nice
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Would not recommend China tires.

I wrote an article about axia here

If you have the money, XM2+ is the best.
TSepjx31
post Nov 30 2022, 05:14 PM

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QUOTE(InitialB @ Nov 30 2022, 04:20 PM)
Okay TS,

Which one better? Run Flat tyre or Self Sealing Tyre?

What's the different
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Run flat tires are tires which have a very thick sidewall to support your car's weight when there is no pressure.

Self sealing tires are tires which has a layer of rubber inside the inner liner to seal what whatever puncture you have.

In my opinion, run flat tires are technically much better as it does not limit your size of puncture & it does not mess up your rim.

It is also much more available in the market due to OE tire specs. Have not seen much self sealing tires in Malaysia market tho
TSepjx31
post Nov 30 2022, 06:25 PM

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QUOTE(Wolgie @ Nov 30 2022, 05:38 PM)
Thanks.
If the shop dont have XM2+, any Michelin also okie? PS3 okie?
which more expesive.... sorry no experience on tyre

..... thanks. ur website is very useful. Price also have. the newest?
Seem i found here XM2+ cost 260 higher then u there, which 220
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PS3 is quite over kill but should give you top performance.

What options do your shop provides?
TSepjx31
post Dec 2 2022, 02:24 PM

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QUOTE(InitialB @ Nov 30 2022, 09:35 PM)
So which one more cost effective against puncture or long run?

Run flat tyre you still need to get your tyre fix during punctures except that it allowed you to run to workshop and drive normally to workshop without problem...

As for self sealing tyre it fixed itself with the preinstalled sealant inside the tyre wall.

Run flat tyre is thick on the sidewall and this can affect FC of the car in long run due to thick wall of the tyre and heavier rubber material.

So mind to share your opinion ?
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Good point, I guess this depends on how much the price difference between the tires. I do expect sealant to be priced much lower compare to run flat. However it is very unlikely to have a sealant, run flat on the same size.

If the price is the same, of course sealant make sense, the question is how long can your tire last with the nail inside & how comfortable yo are with this.

Thanks.
TSepjx31
post Dec 4 2022, 08:00 AM

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QUOTE(N9484640 @ Dec 2 2022, 04:00 PM)
epjx31 are there any EV specific tires in our market? lets say low noise is a high priority? got any noise cancelling tires? - thank you in advance

Size - 235/45 R19, original tire used by manufacturer is I think Continental EcoContact 6Q
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To be honest EV specific tire is a hoax to me. The only thing EV vehicle cares about is range and rolling resistance is the key. But reducing RR and calling yourself EV specific tire line is marketing art of work.

Noise cancellation is really hard to achieve due to the natural frequencies of the tire, however one of the best noise tire is continental comfort 6 which sets the benchmark how quiet the tire can be.
TSepjx31
post Dec 4 2022, 02:12 PM

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QUOTE(man @ Dec 4 2022, 11:15 AM)
Hello TS. I'm surveying for new set of 205/55/16.
Looking for best value and longest mileage, but reasonable performance.
Currently using maxxis, but it worn out quite fast.
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Hi, would your be so kind to fill in the tire mileage review form ? Thanks

205/55R16 is the most popular size where practically every manufacturer has a product in this size. Sometimes even 2 ! You can check the price table here. There are about 10 tirelines. My recommendation is XM2+ as it has the best balance in terms of wear and wet braking. Certainly value for money in my opinion.
TSepjx31
post Dec 5 2022, 03:28 PM

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QUOTE(TheOnly @ Dec 4 2022, 11:26 PM)
I’ve been running semi-slicks on public road, and i think I can’t ever go back to normal tyres like pilot sport 5, as that tyre just cannot keep up with my big brake kit, and activates abs so early, really rendering some perks of my bbk useless.

Any unknown downsides on semi slick for public road? I only know

1.tire wear is extremely short (20k if don’t have too much aggressive weekend drives, or 1.5yr~ for tyre life).

2.shitty wet grip, well i take that as a good thing as i’ll slow the fk down when it’s raining, heck even before moving to semislick i already very prone to aquaplane with 275 wide tyre.

3.a need to always make sure/aware of tyre temp/ is warmed up before any huge cornering forces is applied.

4. Nvh? But hell I don’t care about nvh in a car, i got a proper house to properly appreciate a peaceful quiet time, a car is to drive not to live in.

5. Annoys the fuck outta your fellow friends behind you with the amount of sand/stones your sticky tyre will throw at them
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Hi thanks for your question. Seems like an interesting topic so i will try to answer you point by point.

1. the wear is optimized for track use, hence you cant compare it like this. But the tire is much softer hence suffer in wear performance. Usually you will only last 1-2 days of track usage.
2. Based on my article below which I compare Michelin Pilot Sport 4S vs Michelin Pilot Sport Cup 2 here , there is a 20% wet reduction. For sure the best way to avoid aquaplaning is to reduce your speed.
3. Your point is valid for all tires as well smile.gif
4. Based on the test results, there is no much difference. I even think that semi slick would be much better noise due to a lower void.
5. Haha, to be honest nobody can escape these stones. smile.gif
TSepjx31
post Dec 5 2022, 03:45 PM

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QUOTE(joshgm_119 @ Dec 5 2022, 11:25 AM)
Hey TS

Just out of curiosity as I had a look at your price list. I notice Potenza RE004 and Michelin PS3 has been omitted from your list.
I was looking specifically at 195/50/R15.

Is there a reason for this?

Cheers!
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Good point, I could not find a valuable source but there is no valid reason.

Nonetheless, you should see RE004 prices from tomorrow. smile.gif


TSepjx31
post Dec 8 2022, 11:15 AM

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QUOTE(legendgod @ Dec 7 2022, 11:09 PM)
Is tyre counterfeit common in Malaysia? How to check whether genuine or not?
Replacing accord 2010 all 4 tyres tomorrow. For 1k budget, any recommendations?
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Hey sorry for the late reply, if i am not wrong, your tire size is 225/50R17?

Based on my price table here :

Kumho Ecsta PS31 225/50R17 364
Goodyear EfficientGrip 225/50R17 420
Yokohama Advan Fleva V701 225/50R17 425
Continental UC6 225/50R17 (NEW UC7) 488
Continental Max Contact 6 225/50R17 515
Michelin Primacy 4st 225/50R17 568
Michelin Pilot Sport 4 225/50R17 (NEW PS5) 630

Unfortunately, none of them meet your 1k budget sad.gif

If budget is your main concern, Goodyear EfficientGrip could be a good choice.

The question is what is your main requirements?
TSepjx31
post Dec 8 2022, 11:16 AM

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QUOTE(legendgod @ Dec 7 2022, 11:09 PM)
Is tyre counterfeit common in Malaysia? How to check whether genuine or not?
Replacing accord 2010 all 4 tyres tomorrow. For 1k budget, any recommendations?
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Regarding counterfeit, I think this is hardly an issue in Malaysia as tires are not so easily produced.

Just stick to reputable shops & stay away from China tires if this is your main concern
TSepjx31
post Dec 8 2022, 11:19 AM

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QUOTE(claudetan @ Dec 7 2022, 07:34 AM)
Using 4 yokohama blueearth ES tyres before but hit some metal piece on the road and 1 tyre bursted.

Workshop didn't have the same tyre and i forced to get a triplemax 2, workshop said the thread pattern similar.

However, when i sent my car to SC, the service advisor claims that not all tyre same, hence it cant be balanced/aligned, is it true?
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At first thought this sounds very BS.

But thinking it thoroughly, this could happen if the extra tire's uniformity data is out of this world.

However maybe you can convinced them to try first and show you the data why this can not happen.

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