...neutral handling, high levels of mechanical grip,safe and predictable handling.
...chassis meets the latest 2014 MSA / MIRA Testing Standards.
...low cost maintenance – although almost every part for the PR3 is bespoke and made from the finest quality materials the amount of spares needed and cost has been kept to a minimum.

PR3 - the concept

Originally conceived by the name behind the ultra-successful JKS/Speads in the UK – the PR3 chassis was developed on behalf of DSE by ProFormance Metals Ltd to pass the stringent MSA 2014 Roll Hoop Test.

During further development through-out 2019/20 we ‘designed in’ new features to increase cooling, braking and reliability as well as developing new modular uprights and a new body shape with full enclosed ‘coke bottle’ shaped rear bodywork to reduce drag and improve rear downforce.

Created primarily with the Monoposto Championship & F1000 single seater motorsport in mind the PR3 has been however been built to take a variety of power units. Via a choice of rear chassis sections the PR3 can be fitted with a variety of power units from 1340/1000cc bike engines to larger car derived engines coupled to a transaxle gearbox eitherway the PR3 has been designed to be simple to maintain and most importantly, an intensely satisfying race car to drive.

performance with safety

The chassis’ neutral handling characteristics combined with a 45/55% weight distribution* gives our car ultra-high levels of mechanical grip whilst still ensuring the PR3 is both entertaining in experienced hands whilst remaining a safely predictable drive for novices.

The PR3 exceeds the 2014 MSA / MIRA Testing Standards.

For safety our new design includes a newly constructed front stub axle offering no longer relying on a single central bolt, offering the option of both left and right hand thread stub axles with three piece wheel nuts ensuring that wheel nuts can now be correctly and accurately torqued.

*with driver and when fitted with a GSXR1000 engine.


Because of it’s two piece chassis design the PR3 is able to accept a variety of Bike engines, ‘conventional’ car derived or electric power units 

The PR3’s flexibility makes this chassis suitable for a multitude of race of championships through-out the world, Monoposto in the UK, F1000 in both the USA and Australia.

The PR3’s high levels of mechanical grip characteristics also make it an ideal Hillclimb or Sprint car for a variety of classes with either Bike or car-based power units.



The PR3 chassis/bodywork/suspension kits available from just £14,995 + vat with complete ‘ready to race’ cars also available with our favoured GSXR 1000cc or Hayabusa power units.

Low Cost Maintenance – Although almost every major part for the PR3 is bespoke and manufactured from high grade materials the number of spares needed and costs has been kept to a minimum by making as many parts as possible ambidextrous and where possible compatible front to back


Although we have completely re-designed the majority of the machined components for the new car we have tried to ensure where possible that our new parts will fit existing JKS and Speads chassis as many of the original spare parts are unavailable, have long lead times or at least hard to get hold of.

What fits the older cars? Uprights, rear hubs, most wishbones, steering rack, drive shafts – a complete upright will replace any corner of an  JKS or Speads with the re-designed front hub solving the long-term problem of the original single central bolt securing the hub. Additionally, we offer both left and right hand thread stub axles/wheel nuts in a three piece design so that wheel nuts can be correctly and accurately torqued.

We have chosen to fit Evo Corse wheels  – We usually have stock of the ‘Dallara pattern’ Formula Evo Corse 9×13, ET1.65, PCD 12.85 and 10.5×13 ET 10.5, PCB 12×85