Look at the wheel of your bike and find the wheel diameter printed on it.

On the chart below, find your wheel diameter in inches or in ERTRO reading and match it to the wheel size in millimeters on the right.

ERTRO

Wheel size diameter (inches)

Wheel size setting (mm)

30-559

26x1.25

1953

35-559

26x1.5

1985

44-559

26x1.75

2030

47-559

26x1.95

2050

 

26x1 1/8 Tubular

1970

 

650-20C

1952

622-20

700x20C

2086

622-23

700x23C

2096

622-25

700x25C

2105

 

700C Tubular

2130

 

28 (700 B)

2237

 

 

 

Turning Speed Measurement On/Off

(If you start from Time of Day display, repeat steps 1 - 3.)

4.BIKE SET is displayed.

5.Press OK. Scroll up or down until “Speed” is displayed.

6.Press OK. Scroll up or down to set Speed on or off. Press OK.

Press Stop to return to BIKE SET. Press and hold Stop to return to Time of Day display.

Turning AutoStart On/Off

(If you start from Time of Day display, repeat steps 1 - 3.)

4.BIKE SET is displayed.

5.Press OK. Scroll up or down until “AutoStrt” is displayed.

6.Press OK. Scroll up or down to set AutoStart on or off. Press OK.

Press Stop to return to BIKE SET. Press and hold Stop to return to Time of Day display.

If you turn AutoStart on, the recording starts automatically when you move your bicycle, and stops when you stop moving your bicycle.

AutoStart and Stop provides accurate speed and distance averages.

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Polar S150, S120 manual Turning Speed Measurement On/Off, Turning AutoStart On/Off

S150, S120 specifications

Polar S120 and S150 are two advanced heart rate monitors designed for fitness enthusiasts and athletes seeking to enhance their training experience. Both devices combine cutting-edge technology and user-friendly features, making them ideal tools for tracking performance and improving health.

The Polar S120 is designed with simplicity and efficiency in mind. It boasts a clear display that makes it easy for users to read their heart rate data in real-time. The S120 tracks heart rate continuously, providing users with insights into their cardiovascular performance during workouts. With a memory capacity for up to 99 training sessions, it allows users to store and review their performance over time, making it easier to assess progress and set future goals.

One standout feature of the S120 is its built-in calorie expenditure calculation, which helps users understand how many calories they are burning during their workouts. This is particularly beneficial for those who are aiming to manage their weight or enhance their fitness levels. The device also features multiple heart rate zones that allow users to tailor their training intensity to meet specific fitness objectives, whether it’s fat burning, improving endurance, or building strength.

On the other hand, the Polar S150 builds on the capabilities of the S120 and introduces additional technological advancements. It offers a more comprehensive training analysis, allowing users to customize their workouts more effectively. The S150 includes advanced features such as interval training support, which lets users perform structured workouts that enhance their speed and endurance.

Moreover, the S150 incorporates the Polar OwnCode technology, which ensures a secure transmission of heart rate data, preventing interference from other heart rate monitors. Both models feature user-replaceable batteries, ensuring longevity and ease of use without the need for frequent replacements.

Durability is a characteristic shared by both the S120 and S150. They are designed to withstand various environmental conditions, making them suitable for outdoor activities. Additionally, they are lightweight and comfortable, so users can wear them for extended periods without discomfort.

In summary, the Polar S120 and S150 are excellent heart rate monitors with distinct features tailored for different user needs. The S120 emphasizes ease of use and fundamental tracking, while the S150 offers enhanced capabilities for more serious athletes looking to optimize their training regimens. Together, they represent Polar's commitment to providing tools that support fitness goals through technology and innovation.