A NEW CLASS OF RUNFLAT INSERT
The CBR team is not new to the industry, with designers and engineers that have had continuous experience in the runflat market since the late 1980s and have already contributed to runflat technology worldwide, including systems in use today.
To turn the CBR concept into a commercially viable product has required considerable financial investment and an expanded team, bringing in new talent, a fresh approach, with engineers qualified in the aerospace industry and at Ferrari’s Formula-One team.
Run Flat Systems Ltd (Runflat CBR) was formed with the objective to introduce a new class of runflat insert to the marketplace that would incorporate beadlock and advanced flat tyre support to provide all-tyres-down drivability on the normal single piece drop-centre wheel.
This brand-new category of runflat insert was designed from the outset to maximise the benefits of the two-piece wheel and runflat combination but in a much lighter weight package that could be rapidly fitted to the single piece wheel.
The design brief included the introduction of further new concepts to ensure CBR would raise performance standards way beyond current state of the art.
Innovations included unique cantilever construction incorporating patented ‘active beadlock’, shock absorption for improved off-road runflat, lightest possible weight through novel design, high speed and long distance capability, sealed lubrication and fitting within 10 minutes or less using tyre fitter’s hand tools or tyre fitting machines.
Beadlock had long been considered commercially unfeasible to fit on the single piece wheel, however CBR was developed to not only make fitting a real possibility but to incorporate a genuine and strong beadlock pressure on both the tyre’s beads and ensuring 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 due to increased vehicle weights but made even more of a necessity because traditional runflat inserts were mounted on the wheel’s centre section, where the wheel was not designed to carry such loadings when running flat. CBR’s cantilever construction directs vehicle runflat loads to the wheel’s seats where the wheel is designed to carry such loads, so reducing the risk of wheel failure and sometimes even the need for uprated wheels.
From earliest trials CBR demonstrated performance levels beyond the capabilities of existing insert systems. However, the CBR team’s objectives required Finabel standards to be exceeded, not only at higher speeds but with all 4 tyres deflated, not two deflated as specified by Finabel.
These objectives have been met. CBR Extreme has also passed PAS 301 Certification by Millbrook Proving Ground / UTAC CERAM. PAS 301 is a British Standard for armoured civilian vehicles and the on-road trials are considerably more demanding than Finabel.
Practicality and user approval trials were carried out in the field over 24 months with a European military organisation and successfully signed off. During this period minor changes were incorporated to ensure CBR was and is a totally user-friendly (soldier proof) product.
There are two CBR types; CBR Escape for lightest weight, and high speed 50km or greater runflat depending on vehicle weight, and CBR Extreme, best suited for longest distance heavy duty and off-road use. Both systems being all-tyres-down capable and CTIS capable if or when required.