UK vs United Kingdom — 1925 vs 1929
| Phantom III V12 | 20/25 Standard | |
|---|---|---|
| Horsepower | 165 hp | 70 hp |
| Torque | 350 lb-ft | — |
| Engine Size | 7,340 cc | 3,699 cc |
| Top Speed | 92 mph | 75 mph |
| Weight | 5,732 lbs | 4,200 lbs |
| Wheelbase | 3,810 mm | 3,264 mm |
| Length | 5,740 mm | — |
| Units Produced | 727 | 3,827 |
| Original MSRP | $15,000 | — |
| Value (Excellent) | $1,500,000 | $200,000 |
| Collectibility | 9/10 | 7/10 |
| Rarity | 8/10 | 6/10 |
On balance, the 1925 Rolls-Royce Phantom III V12 makes a stronger case on paper with more power, higher top speed, greater rarity. However, the 1929 Rolls-Royce 20/25 Standard counters with lighter weight, better value, and its appeal extends beyond mere numbers. Choose the 1925 Rolls-Royce Phantom III V12 for outright capability, or the 1929 Rolls-Royce 20/25 Standard for a more distinctive ownership experience.
Rolls-Royce has long offered a diverse lineup, and comparing the 1925 Rolls-Royce Phantom III V12 with the 1929 Rolls-Royce 20/25 Standard highlights the breadth of the marque's engineering philosophy. The 1925 Rolls-Royce Phantom III V12 holds a clear advantage in raw power with 165 hp compared to 70 hp, a 95-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Rolls-Royce Phantom III uses a V12 OHV displacing 7,340 cc, while the Rolls-Royce 20/25 relies on a Inline-6 OHV with 3,699 cc. The 1925 Rolls-Royce Phantom III V12 claims a higher top speed at 92 mph compared to 75 mph. The Rolls-Royce 20/25 carries a weight advantage, tipping the scales 1532 lbs lighter. Rarity plays a significant role here — with only 727 units built, the 1925 Rolls-Royce Phantom III V12 is considerably scarcer than the Rolls-Royce 20/25's 3,827 examples. On the collector market, the 1925 Rolls-Royce Phantom III V12 commands a significant premium over the 1929 Rolls-Royce 20/25 Standard, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1925 Rolls-Royce Phantom III V12 rates higher among enthusiasts and auction houses.