The Model B was introduced in 1904. The single cylinder Model B remained unchanged from the 1904 Cadillac. The horsepower was now rated at 9 instead of 8.5. In 1904, the optional 1524mm (wide track was not available on the Model B; but this year a 1549mm tread was also made optional by the use of tubular axle to replace the pressed steel axle with standard tread.
| Model No. | Body type | Seating | Price | Weight |
|---|---|---|---|---|
| Model B | Touring | 4 | $900 | 659 kg |
| Model B | Surrey | 4 | $900 | 659 kg |
| 9-T Drive sprocket | 10-T Drive sprocket | |
| 31-T Driven sprocket | 3.44:1 | 3.10:1 |
| 34-T Driven sprocket | 3.78:1 | 3.40:1 |
| 38-T Driven sprocket | 4.22:1 | 3.80:1 |
| 41-T Driven sprocket | 4.56:1 | 4.10:1 |
| 45-T Driven sprocket | 5.00:1 | 4.50:1 |