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I had my rear tyre replaced n it so long ago and noticed the other day that it felt sluggish so checked the pressure and was surprised to notice that not only was the pressure down but that hundreds and hundreds of small cracks had developed in the read of th tyre itself. I pumped the tyre up to 40psi again and checked it a week or so later only yo noticed it has lost a few PSI again.

I'm not exactly sure how many km's I've done on this tyre but it can't be that many. Any idea what's causing this?

20201122_183748_1607496426100.jpg
20201122_183800_1607496461235.jpg
 

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JMHO...
To me it looks age and weather related damage.
Check the date of manufacture, because it could
have been inappropriately stored in dealers storage
for example.
Are you parking the bike outside on the sun?
 

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Looks like you are running the tires under recommended pressure. The tread on the centre of the tire is good, yet the sides is worn. Usually it's the opposite of what normal wear is. That could be contributing to your cracks.
 

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Are those actually cracks? Has the owner been cornering at a high/aggressive level? It looks more like the wear and tear that develops on tires from riding/pushing the bike hard in the twistees, as it’s primarily showing the wear on the outer edges of the tire. I really couldn’t tell if those were actually cracks from the pic provided, so my guess is its wear. In my years of experience with bikes, I’ve never seen cracks on that part of the tire.
 

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Are those actually cracks? Has the owner been cornering at a high/aggressive level? It looks more like the wear and tear that develops on tires from riding/pushing the bike hard in the twistees, as it's primarily showing the wear on the outer edges of the tire. I really couldn't tell if those were actually cracks from the pic provided, so my guess is its wear. In my years of experience with bikes, I've never seen cracks on that part of the tire.
I agree, it looks more like really aggressive cornering, or accelerating hard out of corners. I looked closely at the photos and it looks more like displaced rubber than cracks. Can you actually stick something very thin into the cracks?
 

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They are definitely cracks. The forum seems to have reduced the fidelity of the images when uploaded but the original clearly show cracking:

https://photos.app.goo.gl/hgbCi6cTzznnS5beA
https://photos.app.goo.gl/6DQubZtoWNuyweoh6
Not only can I see the cracks vividly now, I can also see that the tire looks old and shows signs of aging and possibly dry-rotting. If you recently bought those tires, my first thought is you were sold tires that were already well-past their shelf life date, and should've have been pulled from stock rather than sold to you or anyone else. If I remember correctly, I think the rule is...if/when it's been 2 years since the date the tires were produced, they should be removed from the seller's inventory. However, most companies intentionally overlook that requirement, and sell them to unsuspecting customers anyway. Because of that reality, I NEVER order tires over the internet. I ALWAYS call the company, speak to a live person, and request that person verifies the date of production on the tire, before I place my order over the phone with that person. I realize that process takes a few minutes longer, but its definitely worth it to me. My recommendation is to contact the company that sold you the tires, and try to get them to replace the tires, based on them being defective, whether or not they were old tires when you purchased them. If they refuse to oblige/support you, find another supplier, and make sure those replacement tires have a very recent production date. I would not continue riding the bike with those cracked, unsafe tires mounted. It's far too much of a risk.

Good luck with your endeavors, and please keep us posted on the outcome.
 

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You shouldn't ride with that tire. How low was the pressure and how long do you think it was low?
 

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Time for new tire like 6 months ago! ???
 

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Been watching this thread for a week now and OP has not said what the date code is on that tire.
Would be an interesting bit of info.
 

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It looks more like the middle of 2018, hence 0618...June, 2018. So, if you purchase them about 6 months ago, they were right at the point of needing to be removed from inventory (if the maximum shelf life is 2 years). I realize how upsetting this may be. But, your safety, health, and life are far more important. Thus, I recommend you get a set of new tires immediately, with a focus on the AVON METZELER, and DUNLOP brands...in that order. I also recommend going with a 160/60 size for your front tire. It improves the ride comfort of the bike, as well as providing a slight increase in the ride height and ground clearance of the bike.
 
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