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 Ask my anything about tires, I am a tire engineer

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TSepjx31
post Jan 26 2023, 03:35 PM

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QUOTE(littlefire @ Jan 26 2023, 09:26 AM)
Bro, it can be material. I personally knew 1 Toyo/Silverstone engineer from Taiping/Kamunting usually these tires are for internal stuff use only and not to sell for outsider, if got cheap offer for public those are being sold by distributors. He also feedback if the tire is not on vehicle and want to bring out, they (security) purposely cut to make it damage and unable to sell to public.
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I can only say 😂😂😂
TSepjx31
post Jan 31 2023, 10:51 PM

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QUOTE(firezy @ Jan 26 2023, 03:57 PM)
hi all,
currently on a set of UC6, 215/55/R18 milage 4,500km. as these few days raining, personally i find it is not really great for wet.

any recommendation for other tyres?
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Based on my tire price table

Name Tire Size Price(RM)
Michelin Primacy 4st 215/55R18 680
Continental UC6 215/55R18 (UC6) 546
Goodyear Assurance MaxGuard SUV 215/55R18 489

I would say 4ST is still the best wet braking product out there.
TSepjx31
post Feb 9 2023, 01:05 PM

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QUOTE(ktek @ Feb 9 2023, 12:04 AM)
boss, is it there an intended design to reduce splashes when going through watter puddle
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Yes V shape and high tread depth.

user posted image
TSepjx31
post Feb 10 2023, 03:47 PM

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QUOTE(fx_53_xt @ Feb 10 2023, 11:25 AM)
Dear epjx31,

1) Are OEM tires really different from aftermarket?
- I recently bought a car that came pre-fitted with Bridgestone Potenza S001, which has very polarized wet performance review result on the internet. (Mainly poor results)
- I am skeptical to keep it after these reviews, but I also remember seeing Michelin saying how they custom developed PS4S for BMW M star marked tire.
- Could there be a chance that the S001 i'm having is also designed in a different way to suit the car I'm having?

2) When tires are stored for 6 months at a time without temperature-controlled storage, will there be any degradation from the atmosphere? (Assuming it is stored shaded, but not temperature-controlled)
- I live in a 4 seasons country with mild winter, average temperature is around -5 centigrade range, with a week or two of cold waves that will go as low as -18.
- I took delivery of the car during winter and I immediately swapped out the summer Bridgestone to a Michelin PS4 All Season.
- I stored the summer tire at the tire shop and may / may not swap them back when temperature rises in spring (depending on how much confident I have in the Bridgestone S001 vs my current PS4 AS)
- I took a look at shop's storage area, it is a shaded warehouse but looks to be not temperature controlled. In this condition, will the summer tire degrade after 6 months of storage?
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Interesting. let me try and answer you

1) OEM tires are designed differently than normal replacement tires. There is pro & cons, you can check out the tesla comparison (Michelin-crossclimate-2-vs-michelin-primacy-mxm4

To make things short, usually OE is going for rolling resistance and handling performances which suits its own agenda. From a user perspective a replacement tire is more design for you as they consider solely a user requirement. If I were you , I will swapped them for a replacement tires which suits your requirements.

2) I assume you in the US due to PS4 all season. Usually its the other way around where you are afraid during summer your winter tires will degrade. If you are talking solely about your summer tires there is no issue to store it in a winter condition. By the way, PS4 all season is not a 3 peak mountain certified tire, which means its not mean for serve winter conditions as you are facing. Cross Climate 2 is more suitable if you are looking for an all season liking. But since you already have a summer tire, you should probably get a real winter tire rather than these all season tire


TSepjx31
post Feb 14 2023, 03:11 PM

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QUOTE(KiNd3rbU3no @ Feb 14 2023, 01:39 AM)
Guess you're getting similar enquiry all the time, ha, been trying to go through the posts but still haven't seen anything can help me.(I haven't go through all of them yet)

Okay, looking for new tyres now for my cx5, 225/55R19
I think you have been hearing this all the time, PS4 SUV ?
But then at the back of my head still thinking of looking 2nd option.

Mate, what's your suggestion ?
Any other option that is very close to michelin PS4 SUV or Primacy suv+ that I should take a look ?
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First question you need to help me out is your requirements? Wet, dry or noise?

You could have a look at UC6 SUV vs Primacy SUV for head to head comparison.

Could try your luck and see whether UC7 (newer ver) has this size or not.
TSepjx31
post Feb 17 2023, 10:47 AM

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QUOTE(xandercooper @ Feb 17 2023, 09:20 AM)
hi epjx31,

Currently i'm using Hankook Optimo meo2 205/60R16 for my inspira. 
Planning to change all tyres but seems like the car is for weekend use only.
Need you suggestion as I don't really know much about tyre. and the price range?

Thank you
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Hi there,

Based on my price table here are your options for your size

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

From what I get, your mileage would be low. The next question is what are your other requirements? Are you looking for best possible wet?

The options above are most of the top tires for the segment. Goodyear's Assurance TripleMax 2 could be a cheaper alternative with a price of RM350.


TSepjx31
post Feb 17 2023, 06:56 PM

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QUOTE(xandercooper @ Feb 17 2023, 06:13 PM)
My mileage actually already 155k because before this I use it for work but since working at new place I am using public transport.

Based on your suggestion, seems like Toyo and Goodyear is within my budget. I dont have any specific requirements but may I know, which is less noise and comfort between these 2 tyres? Maybe can add also wet  sweat.gif
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For wet, noise and comfort Goodyear assurance triple max 2 would be a better choice
TSepjx31
post Feb 18 2023, 09:23 PM

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QUOTE(xandercooper @ Feb 18 2023, 12:41 PM)
Thank you for the suggestion. Just now I’m going to workshop and the mechanic suggest Bridgestone ER33 for rm380, is it good bargain compare to Goodyear?
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To be honest, never heard about Bridgestone ER33 before 🤣
TSepjx31
post Feb 24 2023, 05:13 PM

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QUOTE(spreeeee @ Feb 24 2023, 01:47 PM)
does the latest bezza 2022 model tyre 175/60/r15 can be used on bezza 2017 model? will rub fender?
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no issues as long their original OE size did not change which Bezza 2022 vs 2017 did not
TSepjx31
post Feb 28 2023, 11:28 AM

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QUOTE(alexei @ Feb 28 2023, 08:57 AM)
helo epjx31,
I notice a large price gap between 17 to 18 inch tyres.
Can share the reasons?
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I wrote an article about this here sometime ago.

Basically higher inch the higher profit margin it is. This is also a way to support the cheap low inch prices 😜. Same analogy like business class tickets supporting cheap economy ticket price.
TSepjx31
post Mar 8 2023, 05:19 PM

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QUOTE(liverpoolboi @ Mar 8 2023, 04:09 PM)
Looking to change my wife's car tyres..4 pieces..she drives a Honda City..15'..

What are the options that I have around PJ area and what brands..
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Based on the price table here

Viking CityTech CT6 185/60R15 191
Toyo Nano Energy NE03 185/60R15 198
Dunlop SP Sport J6 185/60R15 209
Continental ComfortContact 6 CC6 185/60R15 236
Continental UC6 185/60R15 (UC6) 245
Michelin Energy XM2+ 185/60R15 245
Goodyear Assurance TripleMax 2 185/60R15 247

What are you main requirements?

Michelin XM2+ is the best choice with great balance between wet braking & mileage.
TSepjx31
post Mar 13 2023, 12:16 PM

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QUOTE(ktek @ Mar 11 2023, 11:50 AM)
boss, is there any brand manufacturer got announce their tyre weights as advantage?
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quite common in Europe/US.

https://www.kaltire.com/en/tires/hakkapelii...-r5/359176.html

you can see the tire weight included in the specs smile.gif
TSepjx31
post Mar 13 2023, 02:17 PM

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QUOTE(Fzeo @ Mar 13 2023, 12:27 PM)
I am driving axia 2019.

i used original tires and need to change them soon.

depth is 4mm.

some say i need to change at 3mm. some say go around 1.6mm.

i am looking at conti cc6. but now cc7 is coming. slightly improve.

got 1 shop in kepong offer me 170 for cc7 ea.

also looking at another brand.

any recomendations?
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Depth at 4mm is fairly good, almost 50% of your original tread depth.

I would not change it if I were you. Change around 2-3mm still more reasonable but do be aware of the drawbacks.

What is your main requirements?

CC7 more for comfort while XM2+ has good wear & wet balance.
TSepjx31
post Mar 13 2023, 04:38 PM

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QUOTE(Fzeo @ Mar 13 2023, 02:27 PM)
my main requirement: grip (dry/wet)

noise ratio: dont mind

which one has an optimum tear and wear?
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Michelin XM2+ would be best for you.
TSepjx31
post Mar 15 2023, 02:25 PM

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QUOTE(jmas @ Mar 14 2023, 09:09 PM)
would you recommend changing if tyre is old (>3yrs on road), but rarely driven? long way to go before botak
so far didnt notice drying or cracking

and if say I want to change, got recommend quiet tyre?
not that important on grip, since rarely go above 120km
currently using primacy 4 and its very good for me
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No, 3 years is still fairly young. A tire should be able to do at least 10 years.


Primacy 4 is definitely the top grip + comfort tire. Depending on your size Continental's Comfort Contact 7 would be ideal but lacks the grip power of Primacy 4.
TSepjx31
post Apr 5 2023, 09:57 PM

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QUOTE(unitron @ Apr 5 2023, 01:30 PM)
Question for TS

What could be the reason for the noise, given below scenario ?

- Tire is used Pirelli Dragon Sport, 225/40/R18 that was manufactured back in 2016 (7 years old tires) that still have good thread pattern and depth.
Tire was stored for unknown period since last use, and recently fitted back on the car after balancing and of course alignment.
Tire is making loud humming noise when driven. There don't seem to be any visual defects on the tires, or uneven wear.
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Interesting, I would say definitely something is not in harmony creating the high frequency peak which you deemed annoying. Could you check the surface of your tires whether they are smooth? Also does this come from one single tire (ask someone outside to hear it too) how about the inflation pressure? All checked?
TSepjx31
post Apr 12 2023, 12:06 PM

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QUOTE(littlefire @ Apr 11 2023, 04:33 PM)
No, please no. If want to change just 2pcs never put in front first (Always put new tires in rear) unless the rear is different size or staggered/wider rims.

Dont simply just change no brand tires, if Westlake dont have ask for more famous brand like Giti, Sailun, Maxxis, Nankang alternatives. Some no famous brand cheap tires the rubber composition really bad, my mechanic encounter 1 cant even do normal patching job from outside due to nail and need to do open up the tires do the inner patch + adhesive due to poor rubber composition (hard to bond with the patch). The normal patch unable to seal it with normal adhesive, just imagine at rural area if no spare tires, your tires will keep leaking air even with the patch.  doh.gif
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Totally agree !
TSepjx31
post Apr 18 2023, 03:17 PM

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QUOTE(onetree710 @ Apr 17 2023, 01:34 PM)
The above statement is wrong.
UTQG treadwear is benchmarked against a standard reference tire (SRTT) with a treadwear of 100, not simply any tire by any manufacturers.
You can in fact compare the treadwear between different tires and manufacturers.
Here I copy part of a statement from US government's website:

"The 14-inch SRTT was first introduced in the 1980s. The 14-inch SRTT was manufactured by one company, Michelin North America, Inc (Michelin) and was sold under its Uniroyal brand. NHTSA uses the 14-inch SRTT to evaluate tire treadwear performance by comparing a candidate tire's performance to the performance of the SRTT in a particular performance test. NHTSA also uses the 14-inch SRTT to evaluate test surface friction for safety standards relating to braking because the narrow specifications for the tire (size, component materials, etc.) ensure consistent, repeatable performance."
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This was the main intention. Unfortunately a lot of companies have found way to abuse the system and combine with the difficulty of testing wear consistently and the test tolerance it is really hard to prove them wrong.
TSepjx31
post Jul 15 2023, 03:06 PM

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QUOTE(Confession @ Jun 29 2023, 12:31 AM)
unless the sidewall has damage, it pretty much look still safe to drive
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some manufacturers has this cool idea to show some colour after half its wear or some predefined value. Sounds like this is it
TSepjx31
post Aug 3 2023, 03:41 PM

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QUOTE(minizian @ Aug 2 2023, 01:45 PM)
I am always curious, what happen if a totally stock car was equipped with gripper tires.

Grippier tires as in those semi slick type like AD09/V720 or V730

Will the stock car suspension be overwhelmed with additional grip causing additional wear and tear?

Perhaps making the car slower since they cant take advantage of new found grip?

Does that mean upgrading stock suspension kit is essential to make full use of such tires?
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It depends on how much down force you can apply to the tires (camber angle plays a big role here for normal cars)

You will definitely gain extra grip dues to higher micro surface contact area up to a certain point. Semi slick tires already have more contact points compare to normal tires so yea !

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