XYZ Racing Tarmac Rally Coilovers — Opel KADETT C 1973-1979

The Kadett C’s live rear axle has a reputation among historic rally runners: managed well, it gives the OP04 chassis a beautifully neutral balance on fast tarmac; upset by a rough compression or a mid-corner bump, it will tell you exactly what it thinks of an unsuitable damper specification. The XYZ Racing Tarmac Rally coilover kit for the Kadett C (1973-1979) is built to keep that rear axle where it belongs – planted and compliant through the surface changes that catch out less carefully calibrated setups.

Running a Kadett C on sealed stages in 2026 is a commitment: the cars are increasingly valued, the available competition components increasingly scarce. A coilover specification drawn directly from XYZ’s tarmac rally programme rather than adapted from a road-car platform is exactly what the OP04’s demanding duty cycle requires.

What this coilover does for your 1973-1979 Opel KADETT C

The Kadett C’s MacPherson front and live rear axle geometry reward damper setups that absorb road surface inconsistency without transmitting shock loads through the body – the jolt suppression that keeps front-tyre contact during braking and the rear planted on drive out of a hairpin. With valve tuning drawn from tarmac rally competition use, the XYZ kit helps the lightweight OP04 body track the road surface rather than skip across it. On sealed stages where the tarmac looks consistent but hides compressions and crown changes, that compliance directly translates to predictable front-end grip and rear traction you can genuinely exploit on exit. The Kadett C’s inherently low kerb weight means damper calibration matters more here than on heavier modern platforms – get it right and the car repays the effort with handling accuracy the original fitment could never deliver.

About the Tarmac Rally coilover

The XYZ Racing Tarmac Rally coilover is designed around sealed-surface competition use – specifically, the unpredictable pavement quality that characterises closed-road stages where surface preparation varies between sections and events. It is built to absorb the impulse loads that come with large surface irregularities at speed, suppressing body movement that would otherwise break tyre contact and destabilise the car mid-stage. The calibration settings originate entirely from XYZ’s tarmac rally racing programme, not from an adapted road-car specification, which means the valve tuning reflects the demands of real competitive use rather than a compromise between road manners and circuit work. The result is a coilover that maintains vehicle stability and consistent tyre contact through the kind of varied surfaces that separate well-sorted tarmac rally cars from those that need nursing through rough sections.

Fitment for the Opel KADETT C (1973-1979)

This kit covers the Opel Kadett C, chassis code OP04, across the full production run from 1973 to 1979. Buyers should verify their specific variant against the listed fitment before ordering; the configurator below allows you to confirm the correct specification for your car.

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Verify the correct specification for your build, then configure yours below.