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