This might be helpful:
DB levels for Brands, Oulton, Cadwell, Snetterton & Bedford Autodrome.
Anyone wishing to have their bike tested before a track day is more than welcome to come to one of our circuits and have a noise test free of charge. Simply find a day at your most local track when an event is taking place (all events are listed on our Track day Calendar) and arrive sometime between the start and finish times of the event and we can get your bike tested in just a couple of minutes.
The initial test is a static test which is carried out using a handheld meter. Each bike is measured 0.5 meters away from the exhaust at a 45 degree angle when the engine is being held at the following RPM:
Engine Size 1 cylinder 2 cylinder 3 cylinder 4 cylinder
250cc (4 stroke) 5,500rpm 8,500rpm
400cc (4 stroke) 5,000rpm 6,500rpm 7,000rpm 8,000rpm
600cc (4 stroke) 5,000rpm 5,500rpm 6,500rpm 7,000rpm
750cc (4 stroke) 5,000rpm 5,500 rpm 6,500rpm 7,000rpm
+750cc (4 stroke) 4,500rpm 5,000rpm 5,000rpm 5,500rpm
125cc (2 stroke) 7,000rpm
250cc (2 stroke) 7,000rpm
500cc (2 stroke) 5,500rpm 7,000rpm 7,000rpm
In cases where the motorcycle has two separated exhausts the measurement will be taken as above from the median point between the two.
For bike track days, the noise regulations for each of the circuits are as follows:
Brands Hatch (Indy Circuit) - 105dB daytime, 102db evening
Brands Hatch (GP Circuit) - 101dB
Note: some bookings are run at 98dB, check you booking page for details.
At Bedford Autodrome, we also enforce a drive-by limit of 87.5dB(A) which is measured at a distance of 20m. Whilst we do not currently impose a drive-by limit at any of our other circuits, in the interests of ensuring that the spirit of the noise level limits is respected, we do monitor drive-by levels using noise meters located around the track. If the results of the drive-by monitoring show that your vehicle is generating drive-by sound levels appreciably higher than vehicles with comparable static test results, then you may be called into the pit-lane to address the noise level being generated.
Additional Information
Factors such as air temperature and humidity can affect the level of noise that your bike is producing. This means that whilst on one day your bike is within the respective limits, on another it may fall outside of those limits, preventing you from participating.
For your own piece of mind we urge you to keep a record of your bikes noise level at each event. If you are ever within 1dB(A) of a particular limit then we suggest that you strongly consider having your exhaust looked at before making another booking.