I was at a bike dealership who grey imports secondhand bikes, they were telling me about how they go through the bikes completely before sale, new tyres, new brakes, major servcie etc. Now, I find this is a bit weird, as the bike I was looking at had supposedly had all this done, & yet there were no nobby bits sticking out of the tyres (you know the bits from the mold, little feeler looking things? Not sure what you call them...) The tread didn't look as deep as I thought it should have for new tyres either... Are there tyres without those bits? OEM tyres maybe? with less tread than normal? TIA.