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 Ask my anything about tires, I am a tire engineer

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Daring Star
post Jun 17 2024, 04:21 PM

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Hi Sifu, need advice. My tyre sidewall flatten abit as I didn't notice I'm driving on a punctured tyre.

Is it still safe to drive on this tyre ?

user posted image
ktek
post Jun 17 2024, 04:30 PM

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boss can u explain to me king pin inclination
dwRK
post Jun 18 2024, 09:41 AM

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QUOTE(ktek @ Jun 17 2024, 04:30 PM)
boss can u explain to me king pin inclination
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kuli here answer...

when you turn steering left/right... your wheels rotate along the "king pin" axis... the angle of this axis to vertical, looking from the front... is king pin angle / inclination

dwRK
post Jun 18 2024, 09:48 AM

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QUOTE(Daring Star @ Jun 17 2024, 04:21 PM)
Hi Sifu, need advice. My tyre sidewall flatten abit as I didn't notice I'm driving on a punctured tyre.

Is it still safe to drive on this tyre ?

user posted image
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cannot tell from outside... must look inside see if the rim cut the rubber and sidewall or not

ktek
post Jun 18 2024, 10:41 AM

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QUOTE(dwRK @ Jun 18 2024, 09:41 AM)
kuli here answer...

when you turn steering left/right... your wheels rotate along the "king pin" axis... the angle of this axis to vertical, looking from the front... is king pin angle / inclination
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i put smaller rim, will improve/worsen king pin rite.
how about negative offset
littlefire
post Jun 18 2024, 10:44 AM

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QUOTE(Daring Star @ Jun 17 2024, 05:21 PM)
Hi Sifu, need advice. My tyre sidewall flatten abit as I didn't notice I'm driving on a punctured tyre.

Is it still safe to drive on this tyre ?

user posted image
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As per other member feedback, need open up and see the internal if inside also already rubbed and crack on the side wall then cannot use already. Usually if serious when open up the tires inside will got a lot of rubber debris can throw de.
Duckies
post Jun 18 2024, 10:46 AM

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Is Michelin Primacy SUV still the best tire for SUV? My tire is about 3 years old with 60k mileage but the "bunga" still nice and still looks okay..not sure need to tukar or not.

This post has been edited by Duckies: Jun 18 2024, 11:44 AM
ayamxxx
post Jun 18 2024, 11:41 AM

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QUOTE(Duckies @ Jun 18 2024, 10:46 AM)
Is Michelin Primary SUV still the best tire for SUV? My tire is about 3 years old with 60k mileage but the "bunga" still nice and still looks okay..not sure need to tukar or not.
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Kinda the best bang for comfort. If want performance aspect, take PS4 SUV. For SUV, my experience with Continental UC6, just poor, 8k km already botak at sides even done alignment rotation. Dry ok quiet but rain, heavy rain, this UC6 cant keep up for traction

This post has been edited by ayamxxx: Jun 18 2024, 11:42 AM
Duckies
post Jun 18 2024, 11:44 AM

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QUOTE(ayamxxx @ Jun 18 2024, 11:41 AM)
Kinda the best bang for comfort. If want performance aspect, take PS4 SUV. For SUV, my experience with Continental UC6, just poor, 8k km already botak at sides even done alignment rotation. Dry ok quiet but rain, heavy rain, this UC6 cant keep up for traction
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Comfort is my priority...I heard a lot of bad experience with UC6 as well hmm.gif
dwRK
post Jun 18 2024, 12:51 PM

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QUOTE(ktek @ Jun 18 2024, 10:41 AM)
i put smaller rim, will improve/worsen king pin rite.
how about negative offset
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smaller rim/tyre will change the scrub radius... if you maintain same negative camber offset, the scrub radius will increase... king pin angle dun change/not affected

This post has been edited by dwRK: Jun 18 2024, 12:55 PM
dwRK
post Jun 18 2024, 12:53 PM

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QUOTE(Duckies @ Jun 18 2024, 10:46 AM)
Is Michelin Primacy SUV still the best tire for SUV? My tire is about 3 years old with 60k mileage but the "bunga" still nice and still looks okay..not sure need to tukar or not.
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no need to change if got bunga and rubber not cracking...

Duckies
post Jun 18 2024, 01:38 PM

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QUOTE(dwRK @ Jun 18 2024, 12:53 PM)
no need to change if got bunga and rubber not cracking...
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Bunga ada.. But cracking I don't know how to see hmm..
crewmy
post Jun 18 2024, 01:43 PM

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The recommended tyre pressure for my car is 220. Everytime I pump 220, then I check again immediately, its down to 210. So I pump 230 so that when I check again, it will be 220. What is your comment on this? TQ
BL98
post Jun 18 2024, 01:46 PM

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Why goodyear tutup kilang in Malaysia? Is the competition from China and Thailand tyre too aggresive?
ktek
post Jun 18 2024, 02:12 PM

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QUOTE(dwRK @ Jun 18 2024, 12:51 PM)
smaller rim/tyre will change the scrub radius... if you maintain same negative camber offset, the scrub radius will increase... king pin angle dun change/not affected
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아아아아 scrub radius.
does it improve or worsen uturn distance
linkinstreet
post Jun 18 2024, 03:03 PM

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QUOTE(BL98 @ Jun 18 2024, 01:46 PM)
Why goodyear tutup kilang in Malaysia? Is the competition from China and Thailand tyre too aggresive?
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"Goodyear has faced accusations of labour abuses, including unpaid wages, excessive overtime and threats against dozens of migrant workers at the Malaysian manufacturing plant in recent years.

The company and the workers reached a settlement agreement in 2022, with each employee paid 50,000 ringgit to 200,000 ringgit ($10,660 to $42,644) depending on the length of their employment,"
dwRK
post Jun 18 2024, 03:15 PM

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QUOTE(ktek @ Jun 18 2024, 02:12 PM)
아아아아 scrub radius.
does it improve or worsen uturn distance
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charge rim/wheel size... biggest effects are spedo, fc n comfort... the rest you can ignore safely

dwRK
post Jun 18 2024, 03:23 PM

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QUOTE(crewmy @ Jun 18 2024, 01:43 PM)
The recommended tyre pressure for my car is 220. Everytime I pump 220, then I check again immediately, its down to 210. So I pump 230 so that when I check again, it will be 220. What is your comment on this? TQ
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your tyre is hot...you pump cold air in... it cools down a bit so it now reads lower

pump in the morning before heavy driving then should be stable... otherwise pump a bit more, then check pressure the next morning so you know how much to adjust next time

dwRK
post Jun 18 2024, 03:31 PM

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QUOTE(Duckies @ Jun 18 2024, 01:38 PM)
Bunga ada.. But cracking I don't know how to see hmm..
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sidewall dry rot and weather cracking
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ktek
post Jun 18 2024, 05:39 PM

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QUOTE(dwRK @ Jun 18 2024, 03:15 PM)
charge rim/wheel size... biggest effects are spedo, fc n comfort... the rest you can ignore safely
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that y want to ask tayar lou. hopefully we learns from him

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