Are New Tyres Faster Than Old Tyres?

Matthew Johnson, Devpreet Surae, George Watson


The lowest legal depth of a tyres tread is 1.6 millimetres. When thinking about a worn tyre with the legal tread limit the circumference is 0.034 metres less than a brand new tyre. Over the distance of which a car with new tyres travels at 30 miles per hour this difference in circumference equates to the car travelling approximately 0.511 miles per hour slower.


Physics; Mechanics; Material properties; Cars

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References (2012). Law about car tyres | AA. [online] Available at: [Accessed 10/03/2016].

Kwik Fit. (2016). Tyres And The Law: Advice On Legal Tyre Standards. [online] Available at: [Accessed 10/03/2016].

Halfords Advice Centre. (2016). Tread Depth and Safety. [online] Available at: [Accessed 10/03/2016]. (2016). Tyre Size Calculator: Size Conversion | [online] Available at: [Accessed 10/03/2016].

ACPO (2016). ACPO Speed Enforcement Policy Guidelines 2011-2015: Joining Forces for Safer Roads [online] Available at: [Accessed 10/03/2016].


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