Description
1999 Caterham Seven Supersport 1800 K-Series
Metallic Poseidon Blue
31, 430 miles (2, 430 miles in my ownership)
Comes with comprehensive service and ownership records, including record of build by Arrows F1 engineer.
Reluctant sale of my 1999 Caterham Seven Supersport, powered by the 1. 8 K-Series and fitted with the 6-speed gearbox.
This has been an enthusiast-owned and enthusiast-maintained car that has lived within the Caterham community. It’s been used for dry-weather road driving, always warmed properly, and looked after with the right mindset. Mechanically it’s strong, pulls cleanly, and feels exactly as a Supersport should — light, responsive, and engaging.
Condition is very good for its age. It presents honestly and is well sorted, with no known issues or immediate jobs needed.
Recent work
ACF-50 applied to underbody of the car in December 2025
Steering rack professionally refurbished by Kiley Clinton in October 2025
Mod fitted to address the K-Series “click”
Regular maintenance carried out, with invoices available
New, louder two-tone horn fitted
Both seats removed and refurbished
I’m selling due to changing circumstances — I also tend not to keep cars long-term, preferring to enjoy them and then move on. In this case, I’m looking to move to a more track-focused Caterham, and the sale is very much driven by that change in direction rather than any issue with the car.
Happy to discuss the car in detail — history, ownership, recent work, and what it’s like to live with.
S3 chassis
Lowered driver’s floor
Wide Track Suspension
De-Dion Rear Axle
6 Six Speed Caterham Gearbox
Bilstein Adjustable Shocks
FIA Rollover bar
Steering rack refurbish
Good Avon ZZS Tyres
13” Minilite Wheels
Carbon Fibre Wings All-round
Titanium Stone Guards
LED lights all-round including clear rear lenses
High-level brake lights
Apollo Tank wet sump
52 mm throttle body
Remote Thermostat
Recent Head Gasket Head Skim
Lowered Floor
Refurbished Leather Seats
Soft Bits for Sevens Tunnel Bag
Soft Bits for Sevens Windbreaker
Full hood with removable rear screen
Soft Bits for Sevens Half hood
Soft Bits for Sevens Tonneau
Momo Quick Release Steering Wheel
Eccles-style wing mirror mounts and Spa Mirrors (original mirrors included)
Mechanical Oil Pressure Gauge
Switchable oil/ water temp gauge
Cooling Fan Override Switch
Battery Isolator Switch
Fire Extinguisher
