67-Plate Leon Hummng/Whirling - Send Help!

Jun 4, 2025
4
1
Hi Everyone!

Seeing mixed feelings on what I think the issue on my 67-Plate Leon could be, there's no exact matches on the issue(s) I've noticed, but a fair few similar. I'm not the best on terminology and I'll put as much in as I feel can be helpful - so bear with me :ROFLMAO:

Approx 2-3 weeks ago, I went over a slightly dislodged drain cover at a decent speed going round a bend. Unfortunately, my Nearside Front Left tyre hand a bulge in it the size of King Kong's fist - not ideal. Got it home, tyre changed & balanced (like for like) and assumed my problems would be over.
*Spoiler* - they weren't.

I started driving, again it again a few days after the tyre change, but came to notice a barely noticeable light 'Humming' sound that sounded like it was coming from the nearside front left area, but only when travelling around 40-42mph, anything either side - Nothing of note.

However, the Humming returns somewhat louder, though intermittent (every other second or so, like a phone on vibrate almost, still not exactly loud though) at between 60-65mph only, literally nothing when travelling at any more/less. I felt like I had some further light humming during quick deceleration, but unsure if I was just gaslighting myself at that point.

I've had it off the road for a couple weeks due to being away, though when I came back this week and took the car for a quick run to see what' what, I noticed there is almost a whirling/flapping sound when breaking/decelerating the car to a stop. Which to me sounds like contact between two components, but I'm not in the know by any means.

From what I can see online, I'm seeing a generally 50/50 split on it being a wheel barring issue OR a gearbox/drivetrain(?) issue.

Anyone suffered with the same, or able to give me any quick wins to check-off before I take it to a garage? My local SEAT garage wanted £180 for an hour of diagnosis, and I don't know how long a full deep dive is going to take...

Thanks!
Al
 
Jun 4, 2025
4
1
Additional: A local mechanic who had a very quick look around/drive for me seemed to suspect ''gearbox baring issue'', but pointed out they outsource 95% of their gearbox jobs, quoting a months wait an a lovely £1000 approximate bill, and said it's a very very loose guess on the issue/costs due to them generally not doing gearboxes.

Am I buggered?
 

SuperV8

Active Member
May 30, 2019
1,812
891
When they fitted the new tyre did they also check your wheel is still round?

Assuming your wheel is round and not buckled! I would suspect your wheel bearing for a rhythmic noise after a hard wheel impact. They are not know to be very durable.

Much cheaper to replace than anything gearbox related!
 
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Jun 4, 2025
4
1
When they fitted the new tyre did they also check your wheel is still round?

Assuming your wheel is round and not buckled! I would suspect your wheel bearing for a rhythmic noise after a hard wheel impact. They are not know to be very durable.

Much cheaper to replace than anything gearbox related!
Hi bud, far as I could tell they did check for buckling when the tyre was changed - the fella was pretty thorough and came back to check what was what when i was still having issues.

I'm still fairly certain it'll be the wheel barring personally, but time will tell - just need to get it down to a garage that isnt going to charge the earth for a diagnosis! Then i can at least assess my options
 
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