Garmin D2 MACH1 - FTP Ratings; Wheel Size and Circumference

Females Percentile 20–29 30–39 40–49 50–59 60–69 70–79
Superior 95 49.6 47.4 45.3 41.1 37.8 36.7
Excellent 80 43.9 42.4 39.7 36.7 33 30.9
Good 60 39.5 37.8 36.3 33 30 28.1
Fair 40 36.1 34.4 33 30.1 27.5 25.9
Poor 0–40 <36.1 <34.4 <33 <30.1 <27.5 <25.9
Data reprinted with permission from The Cooper Institute. For more information, go to www.CooperInstitute.org.
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
Your speed sensor automatically detects your wheel
size. If necessary, you can manually enter your wheel
circumference in the speed sensor settings.
The tire size is marked on both sides of the tire. This
is not a comprehensive list. You can also measure the
circumference of your wheel or use one of the calculators
available on the internet.
Tire Size Wheel Circumference (mm)
20 × 1.75 1515
20 × 1-3/8 1615
22 × 1-3/8 1770
Tire Size Wheel Circumference (mm)
22 × 1-1/2 1785
24 × 1 1753
24 × 3/4 Tubular 1785
24 × 1-1/8 1795
24 × 1.75 1890
24 × 1-1/4 1905
24 × 2.00 1925
24 × 2.125 1965
26 × 7/8 1920
26 × 1-1.0 1913
26 × 1 1952
26 × 1.25 1953
26 × 1-1/8 1970
26 × 1.40 2005
26 × 1.50 2010
26 × 1.75 2023
26 × 1.95 2050
26 × 2.00 2055
26 × 1-3/8 2068
26 × 2.10 2068
26 × 2.125 2070
26 × 2.35 2083
26 × 1-1/2 2100
26 × 3.00 2170
27 × 1 2145
27 × 1-1/8 2155
Appendix 75