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FTP Ratings
These tables include classifications for functional
threshold power (FTP) estimates by gender.
Males
Watts per Kilogram (W/kg)
Superior
5.05 and greater
Excellent
From 3.93 to 5.04
Good
From 2.79 to 3.92
Fair
From 2.23 to 2.78
Untrained
Less than 2.23
Females
Watts per Kilogram (W/kg)
Superior
4.30 and greater
Excellent
From 3.33 to 4.29
Good
From 2.36 to 3.32
Fair
From 1.90 to 2.35
Untrained
Less than 1.90
FTP ratings are based on research by Hunter Allen
and Andrew Coggan, PhD, Training and Racing with a
Power Meter (Boulder, CO: VeloPress, 2010).
Wheel Size and Circumference
The wheel size is marked on both sides of the tire. This
is not a comprehensive list. You can also use one of the
calculators available on the Internet.
Wheel Size
12 × 1.75
14 × 1.5
14 × 1.75
16 × 1.5
16 × 1.75
18 × 1.5
18 × 1.75
20 × 1.75
20 × 1-3/8
22 × 1-3/8
22 × 1-1/2
24 × 1
24 × 3/4 Tubular
24 × 1-1/8
24 × 1-1/4
24 × 1.75
24 × 2.00
24 × 2.125
26 × 7/8
26 × 1(59)
46
26 × 1(65)
26 × 1.25
26 × 1-1/8
26 × 1-3/8
26 × 1-1/2
26 × 1.40
26 × 1.50
26 × 1.75
26 × 1.95
26 × 2.00
26 × 2.10
26 × 2.125
26 × 2.35
26 × 3.00
27 × 1
27 × 1-1/8
27 × 1-1/4
27 × 1-3/8
650 × 35A
650 × 38A
650 × 38B
L (mm)
700 × 18C
935
700 × 19C
1020
700 × 20C
1055
700 × 23C
1185
700 × 25C
1195
700 × 28C
1340
700 × 30C
1350
700 × 32C
1515
700C Tubular
1615
700 × 35C
1770
700 × 38C
1785
700 × 40C
1753
1785
BSD 3-Clause License
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Copyright © 2003-2010, Mark Borgerding All rights
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Redistribution and use in source and binary forms, with
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or without modification, are permitted provided that
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• Redistributions of source code must retain the above
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above copyright notice, this list of conditions and the
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