UK vs UK — 1961 vs 1963
| TR4 IRS | 2500 PI | |
|---|---|---|
| Horsepower | 104 hp | 132 hp |
| Torque | 128 lb-ft | 151 lb-ft |
| Engine Size | 2,138 cc | 2,498 cc |
| 0-60 mph | 10.9 sec | 10.1 sec |
| Top Speed | 109 mph | 110 mph |
| ¼ Mile | 17.9 sec | 17.5 sec |
| Weight | 2,249 lbs | 2,811 lbs |
| Wheelbase | 2,235 mm | 2,654 mm |
| Length | 3,962 mm | 4,438 mm |
| Units Produced | 28,465 | — |
| Original MSRP | $2,800 | $4,200 |
| Value (Excellent) | $50,000 | $18,000 |
| Collectibility | 6/10 | 4/10 |
| Rarity | 4/10 | 5/10 |
The 1963 Triumph 2500 PI emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1961 Triumph TR4 IRS counters with lighter weight, stronger collectibility, but the numbers favor its rival. Still, both are remarkable machines, and the final choice often comes down to which driving experience speaks to you.
The 1961 Triumph TR4 IRS and 1963 Triumph 2500 PI share a manufacturer in Triumph, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Triumph brand. The 1963 Triumph 2500 PI holds a clear advantage in raw power with 132 hp compared to 104 hp, a 28-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Triumph TR4 uses a Inline-4 OHV displacing 2,138 cc, while the Triumph 2500 relies on a Inline-6 OHV with 2,498 cc. In the sprint to 60 mph, the 1963 Triumph 2500 PI edges ahead at 10.1 seconds versus 10.9 seconds. The Triumph TR4 carries a weight advantage, tipping the scales 562 lbs lighter. On the collector market, the 1961 Triumph TR4 IRS commands a significant premium over the 1963 Triumph 2500 PI, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1961 Triumph TR4 IRS rates higher among enthusiasts and auction houses.