Yes, fitting the wrong tyres can result in an MOT failure.
During an MOT, tyres are inspected for condition, tread depth, damage, and suitability. Common reasons for failure include tyres below the legal tread depth, visible damage such as cuts or bulges, exposed cords, tyres fitted the wrong way around or specific-wheel fitments being fitted to the incorrect wheel.
Tyres must also be appropriate for the wheel and motorcycle. For example, fitting a tyre that is not designed for the rim size, fitting a tyre marked “not for highway use,” or fitting tyres with incompatible construction types can all raise issues.
In addition, mixing tyre types inappropriately or fitting tyres with incorrect load or speed ratings may result in advisory notes or failure, depending on severity.
While MOT testers do not check insurance or manufacturer recommendations directly, they are required to assess whether tyres are safe and legal for road use. If there is any doubt about safety, a failure may be issued. A common issue we see is scooters with a rear-only fitment tyre being used on a front wheel.
Ensuring your tyres are correctly specified, in good condition, and legally compliant will help avoid MOT issues.
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