This should be an easy one for many!
There's two markers on the tyre, one of which is identifying the legal tread, but what's the raised marker for?
I'm pretty sure in the past I've changed a set of fronts because the tread has met this marker (shaking my head and expecting some well deserved stick for that!)

There's two markers on the tyre, one of which is identifying the legal tread, but what's the raised marker for?
I'm pretty sure in the past I've changed a set of fronts because the tread has met this marker (shaking my head and expecting some well deserved stick for that!)
