Cateye Kosmos CC-ST300 Cyclocomputer Operating Instructions

Product Overview

This document provides operating instructions for the Cateye Kosmos CC-ST300 Cyclocomputer. It covers component identification, button functions, unit preparation, mounting procedures, measurement functions, automatic and power-saving features, troubleshooting, maintenance, specifications, and warranty information.

Components and Parts

Main Unit Display and Buttons:

• A. Main Display (Speed)
• B. Mode Symbol
• C. Speed Scale Symbol
• D. Auto Mode Symbol
• E. Sub-Display (Selected Function)
• F. Mode Button (left button)
• G. Start/Stop Button (right button)
• H. Set Button
• I. AC Button (All Clear)
• J. Battery Case Cover
• K. Contacts

Mounting Accessories:

• 1. Bracket
• 2. Wire
• 3. Sensor
• 4. Sensor Bands-A (S)(L)
• 5. Sensor Bands-B
• 6. Magnet
• 7. Sensor Band Rubber Pad
• 8. Bracket Rubber Pad (2 pcs.)
• 9. Wire Securing Tape
• 10. Sensor Band Screw

Button Functions

• MODE Button (left button): Changes the display in sequence. Holding for over 2 seconds displays the 24-hour clock.
• START/STOP Button (right button): Starts and stops the measurement of trip distance and elapsed time. The speed scale symbol flashes during operation. This button is invalid in Auto Function.
• SET Button: Used for setting wheel circumference, clock time, switching the Auto Function on/off, and clearing data. In a stop state, it allows revision of:
  • Wheel circumference (in O mode)
  • 24-hour clock (in mode)
  • Auto function (in T, D, or A mode)
• AC Button (All Clear): Pressing this button on the back erases all stored data (Odometer, speed scale, wheel circumference, clock time). All displays illuminate, followed by the mile/h symbol. This should be used after replacing the battery or if an irregular display occurs. Necessary data must be reset afterwards.

Fig. 1: Diagram illustrating the main unit with labeled buttons (A-K) and mounting accessories (1-10).

Fig. 2: Illustration of the reset operation by simultaneously pressing the MODE and START/STOP buttons.

Main Unit Preparation

1. How to measure wheel circumference (L) of your bike (Fig. 3)

   Mark the tire tread, ride the bike for one full revolution, and mark the start and end points on the ground. Measure the distance between these marks. Alternatively, use the "Selecting Values Cross Reference Table" for approximate circumferences based on tire size.

   Fig. 3: Depicts measuring wheel circumference by marking the tire and ground.

2. Setting Speed Scale (Fig. 4)

   After pressing the AC Button, all displays illuminate, and the mile/h symbol appears. Pressing the START/STOP Button alternates between Km/h and mile/h. Press the SET Button to select the desired speed scale, which changes the display as shown in Fig. 5.

   Fig. 4: Shows the display after AC button press, indicating speed scale selection.

   Fig. 5: Illustrates the process of setting the wheel circumference value.

3. Setting the wheel circumference (Fig. 5)

   The default circumference is 2155mm (standard for a 27" wheel). Press SET to accept this value. To revise, use the START/STOP Button to increase and the MODE Button to decrease the number. Hold buttons for rapid adjustment. Press SET to confirm the new value.

4. Resetting or changing the wheel circumference

   Set the main unit to O mode using the MODE Button and stop it with the START/STOP Button. Press the SET Button; the stored number will flicker. Revise the number as described in step 3.

5. Setting the clock time (Fig. 6)

   Press and hold the MODE Button for over 2 seconds to select the clock mode, then stop with the START/STOP Button. Press SET; minutes will flash. Use START/STOP to advance minutes (hold for rapid advance). Set the time a minute or two ahead. Press MODE; hours will flash. Use START/STOP to adjust hours. Press SET to complete. Seconds will reset to zero upon pressing SET. For accuracy, set by radio time signal.

   Fig. 6: Illustrates setting the clock time, showing minutes flashing then hours flashing.

Mounting to Bike

• Attach the magnet to the right spokes of the front wheel, ensuring spokes pass through the magnet's interior (Fig. 7-1, 7-2).
• Attach the sensor to the right fork using Sensor Bands-A and -B. Select the appropriate band size (S for up to 24ø, L for oversize) for the fork diameter.
• Assembly: Insert band-B into band-A, place the rubber pad inside band-A (Fig. 8). Adjust length so band screw-fastening parts are parallel on the fork (Fig. 9). To separate bands, pull strongly.
• Mount the adjusted bands and sensor to the fork, temporarily tightening the screw (Fig. 10).
• Align the magnet's center with the sensor's marking line (Fig. 11) and ensure a 2mm clearance between them (Fig. 12). Tighten the screw securely. Trim excess band-B.
• Secure the wire with tape (Fig. 13), winding it around the outer cable and adjusting length. Ensure the wire does not hinder handlebar operation.
• Attach the bracket near the handlebar stem, using 1mm or 2mm thick pads if necessary for handlebar diameter (Fig. 14).
• Slide the main unit onto the bracket from the front until it clicks. To remove, pull forward while pushing the lever (Fig. 15).
• Test: Lift the front wheel and spin it. Check if the speed is displayed. If not, readjust the magnet and sensor positions.
• Battery Replacement (Fig. 16): Turn the main unit over, remove the battery case cover with a coin, insert a new CR2032 lithium battery with the (+) pole upward, and close the cover securely. After replacement, press the AC Button and reset necessary data.

Fig. 7-1 & 7-2: Diagrams showing magnet placement on spokes and sensor placement on the fork.

Fig. 8: Illustration of sensor bands A and B assembly with a rubber pad.

Fig. 9: Depicts parallel alignment of sensor bands on the fork.

Fig. 10: Shows temporary screw tightening for sensor mounting.

Fig. 11: Illustrates aligning the magnet's center with the sensor's marking line.

Fig. 12: Shows the required 2mm clearance between magnet and sensor.

Fig. 13: Depicts securing the wire with tape along the outer cable.

Fig. 14: Shows attaching the bracket to the handlebar stem.

Fig. 15: Illustrates sliding the main unit onto the bracket and the release lever.

Fig. 16: Shows replacing the battery (CR2032) with the positive pole upward.

Measuring and Display Functions

• S Current Speed: Displays speed from 0.0 to 65.9 mile/h, updated once per second. Accuracy: ±0.3 mile/h under 31 mile/h.
• O Total Distance (Odometer): Displays distance from 0.0 to 99,999 miles. Resets to zero at 10,000 miles/km or when battery wears out/all clear is performed. Accuracy: ±0.1 mile.
• M Maximum Speed: Displays the highest speed recorded from 0.0 to 65.9 mile/h. Resets to zero upon reset operation. Accuracy: ±0.3 mile/h.
• A Average Speed: Displays average speed from start to current point, up to 27 hours 46 minutes 39 seconds or 999.99 miles/km. Displays "(.E)" if limits are exceeded. Accuracy: ±0.3 mile/h.
• D Trip Distance: Displays distance traveled from start to current point, from 0.00 to 999.99 miles. Resets to zero upon reset operation. Accuracy: ±0.01 mile.
• T Elapsed Time: Measures time from 0:00'00" to 9:59'59". Resets to zero at 10 hours or upon reset operation. Accuracy: ±0.003%.
• 24-hour clock time: Displays the current time from 0:00' to 23:59'. Accuracy: ±0.003%.

Automatic Start/Stop Function

This function automatically starts or stops the measurement when the AT symbol appears on the screen, eliminating the need to press the START/STOP Button manually. To switch the Auto Function on/off, press the SET Button while in T, D, or A mode. When active, the AT symbol is displayed. This function pauses elapsed time measurement during stops. A 2-second delay may occur when mounting the unit with this function active.

Power Saving Function

If the main unit receives no signal for 60-70 minutes, the power supply shuts down, and only "( )" is displayed. The unit reactivates by pressing the MODE Button, START/STOP Button, or by receiving a signal.

Troubleshooting

The following situations do not indicate a malfunction. Check these points before seeking repair:

• No current speed display: Short-circuit the contacts on the back with metal. If speed appears, the unit is functional.
• Slow display response: Likely due to low temperatures (below 0°C / 32°F). Response returns to normal as temperature rises.
• No display: Check if the lithium battery is depleted. Replace with a new battery.
• Incorrect data: Execute the "All Clear" operation.
• Current speed does not appear:
  • Check for dirt on the main unit or bracket contacts; wipe clean.
  • Ensure the distance between the sensor and magnet is not too far.
  • Verify the sensor's marking line aligns with the magnet's center. Refer to "Sensor/Magnet Mounting" for correct adjustment.
  • Check if the wire is broken; replace the bracket & sensor part if necessary.
• Transmission signal loss in damp or wet conditions: Water or condensation between the sensor and computer can interrupt data transmission. Wipe contacts with a dry cloth. A water-repellent silicon gel (from automotive/hardware stores) can be applied to contacts, but avoid industrial water repellents which may damage the bracket.
• Unit does not activate or stop when START/STOP Button is pressed: Check if the unit is in Auto Function mode, where the START/STOP Button is inactive.

Maintenance/Precautions

• Do not leave the main unit exposed to direct sunlight when not in use.
• Do not disassemble the main unit, sensor, or magnet.
• Prioritize road safety; avoid excessive focus on the computer while riding.
• Periodically check the relative position of the sensor and magnet.
• For cleaning, use neutral detergent on a soft cloth, then wipe dry. Do not use paint thinner, benzine, or alcohol, as they can damage the surface.
• If mud or sand obstructs buttons, wash gently with water to restore button movement.

Specifications

• Applicable Cycle Sizes: 10mm - 2,999mm
• Applicable Fork Diameter: 11ø - 36ø (S: 11 - 26ø, L: 21 - 36ø)
• Wire Length: 70cm
• Power Supply: Lithium Battery (CR2032 x 1)
• Battery Life: Approx. 3 years (initial battery life may be shorter)
• Dimension/Weight: 1-15/16" x 1-25/32" x 11/16" (49 x 45 x 17mm) / 0.9 oz (25.5 g)

* Specifications and design are subject to change without notice.

Setting Values Cross Reference Table

The tire size is marked on both sides of the tire.

Limited Warranty

1-Year Warranty for Main Unit Only (Accessories/Attachments and Battery Consumption excluded)

If trouble occurs during normal use, the part of the Main Unit will be repaired or replaced free of charge. The service must be performed by Cat Eye Co., Ltd. To return the product, pack it carefully and remember to enclose the warranty certificate with instruction for repair. Please write or type your name and address clearly on the warranty certificate. Insurance, handling and transportation charges to our service shall be borne by the person desiring service.

Address for service:
CAT EYE CO., LTD.
2-8-25, Kuwazu, Higashi Sumiyoshi-ku, Osaka 546 Japan
Attn.: CAT EYE Customer Service Section

Service & Research Address for United States Consumers:
CATEYE Service & Research Center
1705 14th St. 115 Boulder, CO 80302
Phone: 303-443-4595 Toll Free: 800-5CATEYE
Fax: 303-473-0006 e-mail: CatEyeUSA@aol.com

Available Accessories

• #169-6560 (#169-6565): Bracket Sensor Kit (Long)
• #169-6567 (#169-6562): Center Mount Bracket Kit (Long)
• #169-6568: Bracket Sensor Kit for Aero Bar
• #169-6569: Stem Mount Bracket Kit
• #169-9730: Heavy Duty Wire and Bracket Sensor Kit
• #169-6170: Attachment Kit
• #169-6280: Universal Sensor Band
• #166-5120: Wheel Magnet
• #166-5150: Lithium Battery (CR2032)