Recently we were asked to explain the rules around the plugging of motorcycle tyres in Practical Sportsbike Magazine, after one reader asked if a plugged tyre would pass an MOT?
MOT testers have a lot of discretion when it comes to things like this, explained Bryn. However, if a plug meets British Standards, there shouldn’t be an issue.
The rules around the plugging of tyres are different depending on their speed rating.
All plugs must be fitted only within the treaded area of the tyre, and only within 25% of the centre line. They should also be perpendicular to the rim.
A tyre up to and including a J speed rating can have a maximum of two plugs, of no more than 6mm each. However, as these tyres are only rated up to 62mph, they are not so common in the UK. Plugs should not overlap.
Any tyre rated greater than J, all the way up to a V-rated tyre which is capable of speeds up to 149mph, can have one single repair with a plug of 3mm or less.
If you’ve got a Z-rated tyre, capable of speeds of 150mph or more, it can only be plugged if sanctioned by the manufacturer. That means checking with the tyre maker, so if in doubt speak to your nearest motorcycle tyre dealer who may already know, or can find out for you in a technical handbook.
As well as being the UK’s largest wholesaler of motorcycle and scooter tyres, Cambrian also offer a wide range of ancillary products including repair plugs to our trade customers.
With more combined experience than any other team in the motorcycle tyre industry, there’s also no better place to call as a dealer if you’re in need of advice!
