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Bicycle Trail Calculator

Calculate your bike's trail

1. head angle (degrees)
2. fork offset (mm)
3. bead-seat diameter (mm) 635 mm (700B) 630 mm (27x1 and larger) 622 mm (700C) 599 mm (26x1.25-1.375) 597 mm (26-inch S-6) 590 mm (650A) 587 mm (700D) 584 mm (650B) 571 mm (650C) 559 mm (MTB 26x1-2.3) 547 mm (26-inch S-5) 540 mm (600A) 520 mm (24x1, 24x1 1/8) 507 mm (24x1.5-2.125) 490 mm (550A) 457 mm (22x1.75-2.125) 451 mm (20x1 1/8-1 1/4-1 3/8) 440 mm (500A) 419 mm (20x1 3/4) 406 mm (BMX 20x1.5-2.125) 390 mm (450A) 369 mm (17x1 1/4) 355 mm (18x1.5-2.125) 349 mm (16x1 3/8) 340 mm (400A) 337 mm (16x1 3/8) 317 mm (16x1 3/4) 305 mm (16x1.75-2.125) 203 mm (12 1/2 X anything) 152 mm (10x2) 137 mm (8x1 1/4)
4. tire width (mm)
5. calculated wheel diameter (mm)
6. calculated trail (mm)
7. calculated flop (mm)

(use the up/down cursor keys to increment/decrement values)

Use this alternate version to compare two different geometries.

Other trail calculators:

• Geometrical Relation between Head Tube Angle, Trail and Fork Offset
• Kogswell Front-end Geometry Calculator

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