Runflat CBR

Pioneers of combined beadlock and runflat support (CBR) on the normal single piece drop-centre wheel

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About Runflat CBR

The CBR team is not new to the industry and includes senior design engineers with continuous runflat experience since the 1980s who have already contributed to runflat technology worldwide. To turn the CBR concept into a commercially viable product has required a considerable financial budget and the team has also been expanded with new talent and a fresh approach, with skilled engineers qualified in the aerospace industry and at Ferrari’s Formula-One team

Run Flat Systems Ltd was incorporated with the objective to create a runflat insert that would provide all-tyres-down drivability on the normal single piece drop-centre wheel, with the benefits offered by two-piece wheel and runflat combinations but in a much lighter weight package that could be rapidly fitted to single piece wheels.

The brief also included new concepts for the runflat insert, bringing new standards of performance unattainable to date.

Innovations included unique cantilever construction incorporating patented ‘active beadlock’, shock absorption for improved off-road runflat, lightest possible weight, high speed capability, long distances, sealed lubrication and it had to be fitted within 10 minutes or less, using normal tyre fitter’s hand tools or tyre fitting machines.

Beadlock had long been considered commercially unfeasible on the single piece wheel, so the Company’s unique CBR concept was developed to not only make fitting a real possibility but to incorporate genuine strong beadlock pressure on both the tyre’s beads, further developed with adjustability to ensure optimum lateral force regardless of tyre make and bead width.

It was understood that reinforced or uprated wheels were a common requirement for runflat operations and the Company’s engineers could see this issue was magnified due to the position traditional runflat inserts were mounted, i.e. on the wheel’s centre section. The new CBR cantilever construction was designed to direct vehicle loads to the wheel’s seats, reducing the risk of wheel failure and need for uprated wheels.

From its earliest trials CBR demonstrated performance levels beyond that of existing systems. However, to meet project objectives all Finabel standards needed to be exceeded, not only at higher speeds but with all 4 tyres deflated. Objectives have been met. Additionally, CBR Extreme passed PAS 301 certification following third party testing at Millbrook Proving Ground by UTAC CERAM / Millbrook. (PAS 301 is a British Standard for armoured civilian vehicles).

Practicality and user approval trials were carried out over 18 months, in the field, with a military customer and minor changes were incorporated to ensure CBR was totally user-friendly.

To suit customer needs the Company has developed two CBR variations, ‘Escape’ for lightest weight, high speed and 50km or greater runflat, depending on vehicle weight, and ‘Extreme’, best suited for longest distance heavy duty and off-road use. Both systems being all-tyres-down capable.

Runflat CBR is located in new industrial premises next to Doncaster’s Robin Hood Airport.