Thanks for any replies!

The flat spot was my thoughts too. Very hard to find at times. If you don't know the history of these tyres best to get them checked out at a trusted tyre store, ask them to check for roundness.bonzaman wrote:i've found flat spots on tyres causes thumping,also check inside edge of tyre for uneven wear.
Taking corners and hearing the noise I can see this/these being the issue but since its only at a certain speed and presuming at any angle of turning I'd be looking at tyres as the culprit as previously mentioned. Once they check out fine move on to the more "severe" items. I say severe as in the amount of work that's required to repair the worn part...rebuilder wrote:CVs worn or Hub Bearings completely shot.
most likely CVs tho, first place to start, if the rubber boot around the CV is broken, i guarantee you the CV joint itself is the issue, if not it still may be.
Jack up the wheel, and try wobble it (by grabbing the tob and bottom and trying to tilt it in and out) if ti wobbles, ur Bearings are shot.
If ur getting the thuds u talk about and its bearing related you'll see it in the free play in the wheel.
From what I know about it: Yes the wheel is doing 0 but the vehicle is still moving - this is effectively a locked up wheel in a slide and this is were the flat spot is being created. If you do a little half second lock I doubt you'll know about it later on. It can happen to ANY type of tyre if its locked up for long enough. The period and speed that the wheel is locked at will determine the severity of the thudding sound and also "sets" the speed that you will hear the thudding clearest. I think this has something to do with the shape of the tread, I believe that as a wheel increases speed the centre of the tread buldges outwards (hence why over inflated tyres wear in the centre the most) and this is what creates the slapping noise on the road - when the tread matches the shape of the flat surface its running on the noise is created.rebuilder wrote:El freddo can u explain the science behind this quote, im intreagued.
All it takes for a flat spot is one solid thump on the brakes that locks up the front end - usually in one of those quick reactions to avoid a collision. The reason why you'll hear the thumping between those speeds is because that's the speed that the skidding occured, thus the period of the speed range that you'll hear it.
Why does it only come back at that speed, surely once you break, the tyre isnt doing any speed anymore, its at 0?
how does it work