Combined Beadlock Runflat (CBR) now brings all-tyres-down performance to the normal single piece wheel.

CBR redefines runflat capability demonstrating performance unattainable with conventional runflat inserts, whether they may be fitted to single or two-piece wheels.

CBR can exceed the capabilities of the best two-piece wheel/runflat/beadlock systems but in a significantly lighter and easier to fit package on the less costly single piece wheel.

This new class of runflat insert is also unique in that it introduces the option of low pressure operations and CTIS on the single piece wheel.

Wide support keeps the tyre centralised on the wheel when running flat and the tyre’s beads are locked on the wheel to prevent movement, instability and to increase runflat distances.

CBR’s unique patented cantilever design incorporates shock absorbing flexibility to ensure excellent contact with road or track, for best performance and control.

Before the introduction of CBR beadlock had not been available on the single piece wheel. Now, CBR’s unique beadlock ensures that best possible traction can be maintained in all situations.

The short film extract is from testing at Millbrook Proving Ground (UTAC) demonstrating all-tyres-down traction on a 35° slope (traction is not compromised on steeper gradients). CBR’s wheel to tyre grip also ensures best possible braking, steering and cornering control when one or all tyres are deflated on normal single piece wheels.

The industry has long accepted that steering control with both tyres deflated on the same axle is unsatisfactory and traction cannot be maintained with both tyres deflated on a driven axle. This has long been recognised for all runflat inserts on single piece wheels prior to CBR, which is why two-piece or specialist wheels have been required for vehicle control with multiple deflations. CBR has revolutionised the industry, enabling the ordinary single piece wheel and a lighter runflat to replace the heavier two-piece wheel for best runflat control, even with multiple deflated tyres.

CBR’s light weight and technologically superior design also supports high speed runflat and evasive manoeuvres that are beyond the capabilities of traditional runflat inserts.

The short film clip is from testing at Bruntingthorpe Proving Ground with one, two and four tyres deflated on a Police specification Volvo.

Runflat CBR Extreme is PAS 301 certified, passing with maximum ratings.

The test vehicle was a Toyota Landcruiser at maximum gross weight and fitted with stock Toyota single piece alloy wheels and off-the-shelf Runflat CBR Extreme.

Film clip is by Millbrook/UTAC.

The vehicle on the short film clip was running at maximum gross weight, fitted with stock CBR Extreme runflat inserts and with all four tyres deflated.

CBR Extreme can complete A.20.A over 150km with 2 or all 4 tyres deflated and CBR Escape A.20.5 with 2 or all 4 tyres deflated, running on stock single piece wheels.

Finabel tests require two tyres deflated, on opposite corners of the vehicle, allowing for the understanding that vehicles on single piece wheels cannot be steered if both tyres of the steering axle are deflated or traction is lost if both are deflated on a driven axle, so in reality these tests are fairly limited in scope.

Finabel test speeds are also low and the road section tests are not as severe as PAS 301.

Runflat CBR Extreme can run for longer distances than other runflat inserts. For special applications, on demand, runflat distances over 250km may be achieved with the optional addition of extra lubrication units within its sealed lubrication system.