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Sunbeam Rapier (1955 to 1976)

By Jon Cosson · Last checked 14 October 2026

The Sunbeam Rapier covers the Series I to V coupes and convertibles (1955 to 1967) and the Hunter-based fastback and Holbay-engined H120 (1967 to 1976). Rust and scarce trim are the main risks, and H120 claims need checking. The fastback Alpine is not covered.

At a glance

Years: 1955 to 1976 (Series I October 1955, II 1958, III September 1959, IIIA April 1961, IV late 1963, V September 1965 to June 1967; fastback October 1967, H120 October 1968, both to 1976)
Body styles: two-door pillarless hardtop coupe; convertible (Series II to IIIA, to 1963); two-door pillarless fastback coupe (1967 to 1976)
Engines: Rootes overhead-valve four: 1390cc (Series I), 1494cc (II and III), 1592cc (IIIA and IV), 1725cc five-bearing (Series V, fastback); Holbay-tuned 1725cc with twin Weber carburettors (H120)
Built in: Ryton-on-Dunsmore near Coventry, England; fastback production moved to Linwood, Scotland, around 1969 to 1970

Why people buy one

A stylish four-seat coupe or convertible with a strong rally history, including a class win on the 1956 Mille Miglia.
Classics World calls the Series III, with its alloy head, front disc brakes and walnut dash, the Rapier's sweet spot.
Mechanical parts are readily available because much is shared with the Hillman Minx, Sunbeam Alpine and Hillman Hunter.
The fastback is a comfortable, refined cruiser capable of nearly 100mph, with overdrive or a Borg-Warner automatic offered.
The H120 adds a Holbay-tuned 105bhp engine with twin Weber carburettors.

What to weigh up

Most Rapier-specific body panels, chrome and trim are scarce, and door skins are among the hardest parts to find.
Car & Classic warns that fastback glass, especially the large rear window, is very hard to find.
H120 claims need proof: the Holbay engine was also used in the Hillman Hunter GLS, and Weber carburettors and H120 badges, spoilers and wheels are easy to fit to an ordinary Rapier.
Series I to IV engines have three main bearings, and Classics World says Series I and II cars were prone to bottom-end wear.
The 1969 to 1975 fastback Sunbeam Alpine shares the body but has a single carburettor and plainer trim; it, the Hillman Hunter and the 1950s Sunbeam-Talbot are not covered here.

Where they rust

Series I to V: upper inner front wings from headlamp to bulkhead, and the lower inner wings down to the radiator panel.
Series I to V: bulkhead and footwell seams where the windscreen seal has perished, and the door hinge areas.
Sills, including their inner faces and the join with the floor.
Door skin bottom edges where drain holes block.
Rear leaf spring hangers, the boot floor and the rear window seal area.
Convertibles: the reinforcing frames underneath, for wrinkling or distortion.
Fastback: front floor pans, rear chassis legs over the axle, rear shock absorber mounts inside the boot, and the front panel around the wing joins.

Mechanical weak spots

Check oil pressure if the car is run: Classics World suggests at least 20psi at hot idle and 45psi or more on the move for Series I to V.
Alloy heads corrode and warp if antifreeze has been neglected; look for head gasket failure and signs of overheating.
Early gearboxes can have weak flywheel ring gear teeth, chipped first gears and worn synchromesh; later all-synchromesh boxes take engine oil.
Check for play in the steering box and stiff hub swivels on early cars, where greasing has been missed.
Rear leaf springs sag with age, and the handbrake often sticks.
Series V is negative earth; earlier cars are positive earth, so check for bodged conversions.
On fastbacks, track rod ends fail often, flaking paint in the fuel tank can block the fuel system, and the overdrive relay is a known fault.

At a Mathewsons viewing

Check the chassis number against the V5C and ask the Rootes Archive Centre Trust to confirm the series and, for a claimed H120, that the number belongs to an H120.
On a claimed H120, open the bonnet and look for "Holbay" cast into the rocker cover and twin Weber 40DCOE carburettors, then check for the boot lid spoiler, Rostyle wheels and polished sill covers.
On Series I to V, lift the carpets and check the footwell seams, sills and floor joins, and look along the inner front wings with a torch.
On a fastback, check the rear window glass and seal for damage and lift the boot mat to inspect the boot floor and rear shock mounts.
Ask for any heritage certificate, old MoTs and receipts, and do not assume the car will be started at the viewing.

Parts, specialists and clubs

Engine, gearbox, brake and suspension parts are readily available because they are shared with other Rootes models, but Rapier-specific panels, chrome, glass and interior trim are scarce, and seats and headlinings usually need specialist trimming. The Rootes Archive Centre Trust holds Rootes production records for Ryton and Linwood-built cars from 1950 to 1976.

Seen on Bangers & Cash

1966 Sunbeam Rapier (Bangers & Cash series 1, episode 2, First shown April 2019)
1964 Sunbeam Rapier (Bangers & Cash series 10, episode 13, First shown October 2024)

Sources

Series I to V Sunbeam Rapier buyer's guide (Classics World), 7 January 2026
Rootes Arrow buyer's guide (Classics World), 4 July 2023, updated 9 April 2024
Buyer's guide: Rootes' Arrow range (Classic & Sports Car), 10 July 2020
The original Sunbeam Rapier: a celebration (Lancaster Insurance), 11 September 2020
Sunbeam Rapier and Alpine fastback (Sunbeam Car Club of Australia), accessed 14 October 2026
1972 Sunbeam Rapier project profile (Car & Classic), 7 November 2019
Sunbeam Rapier (Sunbeam Car Club of Australia), accessed 14 October 2026
Sunbeam Rapier (Wikipedia), accessed 14 October 2026

An independent guide from Thornton-le-Dale. Not connected with Mathewsons or the programme.