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.

I fully agree. Unless you have issues with abnormal pressure loss which possible could stem from a faulty valve, I don't think it's necessary.

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?

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.

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?

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

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.

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

Probably got more water on the road so you aquaplane more.

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.

To be honest, I don't see this. If you look at the top 4 premium brands (Michelin , Bridgestone, Goodyear and Continental) they are pushing all out with their flagship products. Especially Michelin.

Silica was a moon shot when it came to wet braking. While there has been improvements silica tech over the years to improve wet braking and mileage.

Hence I have a different option compared to you. If possible would like to know what brands and products that you are talking about.

Thanks

Looking at one example only as no time to do more research outside of what I want to buy. Tyre label shows significant drop in wet grip

LH - BFGoodrich (sister of Michelin) - Advantage T/A Drive (predecessor)
RH - BFGoodrich (sister of Michelin) - Advantage T/A Touring (successor)

Maybe they purposely made it worst so that not to compete with Michelin Primacy?

Tuan, is nitrogen filling really necessary? because normally if compressed air from compressor, it will have alot moisture in it because if u compress the air the water vapour also together compress baased on the volume of air compressed. Im thinking since nitrogen filling very fussy need to go to workshop for topup, maybe use those portable type, but now worry about this moisture which may attack the rubber.

i think what he said maybe for asean market, most flagship market are using low profile tyre and for fast car..
ps4 and ps5 consider expensive tyre in msia haha..

hence most of us settle with toyo cr1 or tr1..potenza re004, mc6 or uc7..

Hi Pro,

Is it safe to drive with this tyre?

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.

Hi TS,
I notice most tires have this label regarding "steel, polyamide, nylon, polyester"...
Different tires have different combination.
Could you enlighten us what does it mean? and their pros & cons?

Thank you.

https://www.ustires.org/whats-tire-0

https://www.continental-tires.com/car/tire-...cs/tire-mixture

https://en.wikipedia.org/wiki/Tire

Everything just a google search can get a lot information nowadays..

This post has been edited by littlefire: Nov 2 2022, 03:16 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.

Well said!