By UK law, car tyres must have a tread at least 1.6 millimetres deep. It is about 9 mm on my new tyres. At what point would deeper treads worsen road holding, and why?
Jack Shaw, Barnsley, South Yorkshire, UK
We pay 拢25 for every answer published in New 杏吧原创. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.
Advertisement
This article appeared in print under the headline 鈥淭reading lightly鈥�