Tyre Pressure/Ply Rating

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Originally Posted by JDNSW

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About the only really worthwhile basic innovations in tyres were the introduction of tread in the Edwardian period, the change to balloon tyres in the 1920s, and the introduction of radials in the 1950s. ...

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What about carbon-black added to the rubber compound?

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Originally Posted by chazza

What about carbon-black added to the rubber compound?

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I'm not absolutely certain, but I think that predated motoring - wasn't it introduced when the only users of rubber tyres were cyclists?