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Heart Rate Zone Calculations
Zone % of
Perceived Exertion
Maximum
Heart Rate
1
50–60%
Relaxed, easy pace,
rhythmic breathing
2
60–70%
Comfortable pace,
slightly deeper
breathing, conversation
possible
3
70–80%
Moderate pace, more
difficult to hold
conversation
4
80–90%
Fast pace and a bit
uncomfortable, breathing
forceful
5
90–100%
Sprinting pace,
unsustainable for long
period of time, labored
breathing
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
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
27 × 1-1/4
2161
27 × 1-3/8
2169
16
Tire Size
29 x 2.1
Benefits
29 x 2.2
29 x 2.3
Beginning-level
650 x 20C
aerobic training,
650 x 23C
reduces stress
650 × 35A
Basic cardiovascular
training, good
650 × 38B
recovery pace
650 × 38A
700 × 18C
Improved aerobic
700 × 19C
capacity, optimal
cardiovascular training
700 × 20C
Improved anaerobic
700 × 23C
capacity and
700 × 25C
threshold, improved
700C Tubular
speed
700 × 28C
Anaerobic and
muscular endurance,
700 × 30C
increased power
700 × 32C
700 × 35C
700 × 38C
700 × 40C
700 × 44C
700 × 45C
700 × 47C
Wheel Circumference (mm)
2288
2298
2326
1938
1944
2090
2105
2125
2070
2080
2086
2096
2105
2130
2136
2146
2155
2168
2180
2200
2235
2242
2268
Appendix
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