MG MGB Mark III
The quintessential British roadster that defined a generation of open-top motoring.
- Power
- 95 bhp
- 0–60 mph
- 11.8 s
- Top speed
- 104 mph
- Est. value
- $5k–$19k
About the MG MGB Mark III
The 1977 MGB represents the later 'rubber bumper' era of the world's most popular classic sports car. By this stage, the MGB had adopted impact-absorbing polyurethane bumpers and a raised ride height to meet US safety regulations, though it retained the charming B-Series engine and engaging rear-drive dynamics. While purists often prefer the earlier chrome-bumpered cars, the 1977 model benefited from interior refinements including a new dashboard and improved heating. It remains a cornerstone of the collector market due to its exceptional parts availability and the pure, mechanical driving experience it offers.
MG MGB Mark III specs
The MG MGB Mark III produces 95 bhp (71 kW) and 149 Nm (110 lb-ft) of torque. It reaches 60 mph in 11.8 seconds and has a top speed of 104 mph (167 km/h).
| Make | MG |
|---|---|
| Model | MGB |
| Generation | Mark III |
| Trim | 1.8 |
| Years | 1974–1980 |
| Type | Classic |
| Body style | Roadster |
| Country | United Kingdom |
| Original price | About $4,400 when new |
| Engine | 1.8-litre inline-four |
|---|---|
| Displacement | 1,798 cc (1.8 litres) |
| Induction | Naturally aspirated |
| Power | 95 bhp (71 kW) at 5,400 rpm |
| Torque | 149 Nm (110 lb-ft) |
| Redline | 6,000 rpm |
| 0–60 mph | 11.8 s |
| Top speed | 104 mph (167 km/h) |
| Transmission | 4-speed manual |
| Drivetrain | Rear-wheel drive |
| Weight | 980 kg (2,161 lb) |
| Power-to-weight | 97 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is an MG MGB Mark III worth?
A typical MG MGB Mark III is estimated to be worth $4,500 – $19,000 (about £3,400 – £14,000).
Its original price when new was about $4,400.
Values are directional estimates for a typical example, not appraisals. Condition, mileage, history and specification all change what a real car is worth. Pound figures use the exchange rate of 3 November 2026. How values are estimated
MG MGB Mark III rarity in CarSpot
The MG MGB Mark III is an Uncommon card in CarSpot, with a rarity score of 21 out of 100. Hot hatches and premium sporty cars. An Uncommon card is worth 20 XP.
Each model's tier starts from a 0–100 score based on its value plus its power or production numbers. Once enough players have spotted a model, how often it is spotted can move it up or down one tier. How CarSpot rarity works
Rarity is a collectible game mechanic, not an assessment of real-world scarcity or value.
MG MGB Mark III fun facts
- The 1977 model year introduced a new dashboard layout with a smaller steering wheel and improved heater controls to modernize the aging cockpit.
- To meet US bumper height regulations, MG raised the suspension by 1.5 inches, which famously affected the car's handling until thicker anti-roll bars were added.
- The MGB was one of the first cars to be designed with controlled crumple zones, a significant safety innovation for a 1960s design.
