The knock sound from your tire can have 2 main reasons.

- Reason 1: one of the lug nuts isn't torqued correctly so you need to ask the shop that you visited to torque them correctly.

Ask them to use a torque wrench.

- Reason 2: one of the seals of your tires might be broken or defect. In that case they need to replace your tires.

There's a few other possibilities - cv/brake click/pebble/new screw or nail - but in any case a rotional noise needs to be checked out ASAP....As the previous poster has noted there might be a tread or internal separation in the tire.....Which is one of the flaws with plugging.....

Ever see a shredded tire scattered across the highway = separation....

I think it is fairly clear that your knowledge of tires and tire repair is pretty outdated, and to suggest that "separation" is the largely result of plugging on the tires you see shredded around Thailand or any other country is just not supportable - there are many causes of this and in Thailand v (and elsewhere) it is primarily commercial vehicles and the result of overloading and poorly maintained tires

Ever drive around Arizona ? Tire treads all over the road....You'd like driving there lot's of nice scenery, good straight roads & the signs are simple - even you'd be able to understand them....

I did not say all/most/every tire separation is are due to plugging....I said it's one of the problems that comes when plugs are used......Of course there's many failures and many causes.....

The knocking sound was there already I think before the nail even got in the tire.

Those dually tires you see all over the road - both here and in the West - caused by the tire going flat. Flops around, gets hot, tread separation.

Those dually tires you see all over the road - both here and in the West - caused by the tire going flat. Flops around, gets hot, tread separation.

Most of the treads you see on the roads both here and elsewhere are from trucks - If you look at truck tires in Thailand you'll be appalled. There is also a huge market in secondhand and retread tires.........it's no wonder they give up the ghost on a fairly regular basis..

the other one you see often is the overloaded pineapple and fruit pick ups...they beef up the suspension to take the extra weight but don't address such items as wheel bearings and tires....the obvious consequences of which you'll see by the road every day.

Plugging if done correctly within the BS limits for instance, if perfectly satisfactory....the problem comes when people try to take shortcuts and repair unfit tires.

. There is also a huge market in secondhand and retread tires........

In N. America the law states that the steering axle needs new tires. All the drivers can be retreads, and 99% are. They are 1/3 to 1/2 the cost of new. Excepting new Chinese made tires, which are close to the price of a retread.