UK vs UK — 1957 vs 1975
| TR3A | TR7 Drophead | |
|---|---|---|
| Horsepower | 100 hp | 92 hp |
| Torque | 122 lb-ft | 112 lb-ft |
| Engine Size | 1,991 cc | 1,998 cc |
| 0-60 mph | 10.8 sec | 9.1 sec |
| Top Speed | 105 mph | 109 mph |
| ¼ Mile | 17.7 sec | 17.0 sec |
| Weight | 2,100 lbs | 2,238 lbs |
| Wheelbase | 2,235 mm | 2,159 mm |
| Length | 3,835 mm | 4,064 mm |
| Units Produced | 58,236 | 112,368 |
| Original MSRP | $2,625 | $7,000 |
| Value (Excellent) | $65,000 | $25,000 |
| Collectibility | 7/10 | 4/10 |
| Rarity | 4/10 | 3/10 |
It's a closely fought contest. The 1957 Triumph TR3A brings lighter weight, stronger collectibility to the table, and the 1975 Triumph TR7 Drophead answers with quicker acceleration, higher top speed, better value. Both are excellent machines that reward their owners in different ways — there's no wrong answer here.
Triumph has long offered a diverse lineup, and comparing the 1957 Triumph TR3A with the 1975 Triumph TR7 Drophead highlights the breadth of the marque's engineering philosophy. On paper, the two are remarkably close in power output, with the 1957 Triumph TR3A producing 100 hp and the 1975 Triumph TR7 Drophead delivering 92 hp. Under the hood, the contrast is notable: the Triumph TR3A uses a Inline-4 OHV 8V displacing 1,991 cc, while the Triumph TR7 relies on a Inline-4 OHC with 1,998 cc. In the sprint to 60 mph, the 1975 Triumph TR7 Drophead edges ahead at 9.1 seconds versus 10.8 seconds. On the collector market, the 1957 Triumph TR3A commands a significant premium over the 1975 Triumph TR7 Drophead, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1957 Triumph TR3A rates higher among enthusiasts and auction houses.