What's going on here? There's a ridge in the middle of a rear car tyre. Only one or two millimetres high. I can't understand how it hasn't worn down with the rest of the tyre...
Tyre pressures were adjusted recently, but none of the tyres were well off.
Cheers
That's a new one on me!
Not that have any idea, but for clarity, is the 'ridge' higher than the tread on both sides of the tire, like a spine, or is one half of the tread fully higher than the other half?
What about the other tyres ? If just this one, I'd get it looked at.
It's your tyres' raphe lol
It's your tyres' raphe lol
Aye, looks like - how do they put the tread on a carcass?
is the 'ridge' higher than the tread on both sides of the tire, like a spine,
Yes, like a spine.
What about the other tyres ?
Just this one.
I took the car to the local tyre place just now. I'm not 100% convinced by the answer, and I don't think the mechanic was either when he was giving it (possibly caused by some hard, irregular braking), but he was sure that it's not about to explode. So that's good.
Cheers all
Really strange... I can't see how it would happen during manufacture:
The tread rubber is bonded to the tyre carcass as a seperate piece.. and if it did have a ridge like that, you'd think it would be worn off in very short order from driving, to match the rest of the tread height.
On the rear? If so I think you have a...
Roadhesion ridge back?
It's a line of harder rubber used to help the moulding process on certain types of mould. Basically two moulds do half of the tread each and the band of rubber they put on has a ridge of pre-moulded rubber in it to help the rubber that forms the tread stay there. It wears at a slightly slower rate than the rest of the rubber but the extra height means it gets scrubbed down and 'keeps up, with the wear anyway. There was a much more detailed version of that How It's Made video on YT at some point that explained it. It has no effect on the tyre in use, I've had it on Pirelli's, Goodyears and Michelins over time. I'd be more worried about your inner shoulder tread wearing faster than the rest of the tyre, keep an eye on it to avoid exposed cords.
Yes I am a complete tyre nerd...
At last I can post. Long time lurker .... it's a strip of silica rubber used as a grounding strip to help with static electricity. Silica rubber wears slowly but offers little grip so it can show as a raised rib in the tread. All vehicle tyres have it.
30 years working in the tyre industry.
You do know you can comment/post about anything @Parkpreboi? Not just things you are an expert on. A lot of people on here think they are experts at a lot of things they aren't, but still post away.
