Ascent IO Computer Quick Start Manual

INTRODUCTION
Thank you for purchasing an Ascent™ cycle
computer. With all the features that a professional
rider needs to keep track of a ride, the Ascent
IO is the perfect accessory for any cyclist. The
convenience of coded wireless transmission
makes installation simple and virtually eliminates
interference issues.

BATTERY INSTALLATION

To help you get started quickly, the computer and
transmitter batteries have been installed at the
factory. Under normal use the batteries should last
one to two years. The Ascent IO uses a 3V CR2032
button cell battery (available at most drug stores
or electronic shops) in both the computer and the
transmitter.
NOTE: Most problems that occur with cycle
computers are caused by weak or dead batteries.
Should you need to replace the batteries, follow the
steps below.
COMPUTER HEAD
NOTE: During a battery change, all data will be
cleared from memory. Make a note of your current
wheel size settings and cumulative odometer
mileage before replacing the battery so you
can reprogram these values once the battery is
replaced.
STEP 1: Remove the battery cover from the
underside of the computer using a coin. See
Figure 1. Remove the old battery and dispose of it
properly.
STEP 2: Install a fresh battery with the positive (+)
side facing the battery cover.
STEP 3: Install the battery cover securely, making
sure the rubber O-ring seal around the battery
compartment is still in place and seated properly.
TRANSMITTER
STEP 1: Remove the battery cover from the back of
the transmitter using a coin. See Figure 1. Remove
the old battery and dispose of it properly.
STEP 2: Install a fresh battery with the positive (+)
side facing the battery cover.
STEP 3: Install the battery cover securely, making
sure that the rubber O-ring seal around the battery
compartment is still in place and seated properly.

COMPUTER FUNCTIONS

CLOCK (CLK)

Displays time of day in a 12 hour or 24 hour
format.
TIRE SIZE CIRCUMFERENCE
AUTOMATIC RIDE TIMER (TM)
Auto start/stop timer is activated by front wheel
16 x 1.75 movement and records actual ride time up to 1272
29:59:59.
20 x 1.75 1590

CURRENT SPEED (M/H or KM/H)

Displays current speed, up to 62.4 M/H (99.9 KM/
3 /
24 x 1 1948
H). Accurate to 0.1 M/H or KM/H. Always displayed 8
at the top of the screen.
24 x 1.75 1907

AVERAGE SPEED (AVS)

26 x 0.75 1954
Calculates average speed based on ride time (TM)
& trip distance (DST).
26 x 1.0 1973

MAXIMUM SPEED (MXS)

Displays highest speed attained during a ride (or
3 /
26 x 1 2105
8
since last reset), up to 62.4 M/H (99.9 KM/H).
26 x 1.5 2026

SPEED COMPARISON INDICATOR ( or )

Compares current speed to average speed. As
26 x 1.6 2051
you ride, a ( ) or ( ) will appear next to the current
speed display to indicate whether your current
26 x 1.75 2070
speed is above ( ) or below ( ) your average speed.
This function is automatic, requires no program-
26 x 1.9 2089
ming and cannot be disabled.
26 x 2 2114
1 /
26 x 2 2133
8
TRIP DISTANCE (DST)
Displays distance traveled during current ride
(or since last reset), up to 624.99 miles (999.99
kilometers).
ODOMETER (ODO 1)
Displays cumulative ride distance, up to 62,499
miles (99,999 kilometers) for wheel size
ODOMETER (ODO 2)
Displays cumulative ride distance, up to 62,499
miles (99,999 kilometers) for wheel size
TOTAL ODOMETER (ODO)
Displays total cumulative ride distance for both
wheel sizes combined, up to 62,499 miles (99,999
kilometers).
DUAL WHEEL SIZE SETTINGS
Wheel circumference is used to calculate speed
and distance. The Ascent IO computer includes two
wheel size settings (
ride data on two bikes with different wheel sizes
(e.g. your road bike and mountain bike).
TEMPERATURE
Displays air temperature in °F or °C, from 32°F to
122°F.
AUTO SLEEP
To prolong battery life, the Ascent IO automatically
enters "sleep" mode after 30 minutes of inactivity.
In sleep mode, only the time of day will be dis-
played. To activate the computer when it's in sleep
mode, simply press the MODE button.

DETERMINE WHEEL SIZE

The Ascent IO uses wheel circumference
(measured in millimeters) to calculate speed and
distance. Before programming the computer,
calculate wheel circumference using one of the
three methods below.
1. Select size from chart (least accurate): Use the
chart below to find the circumference for your
tire size. The chart lists the programming sizes
for some of the most popular tire sizes currently
in use. These numbers are estimations which
may not precisely match the circumference of
your wheel, due to variations in tire size between
brands and models.
TIRE SIZE CIRCUMFERENCE
16 x 1.75 1077
20 x 1.75 1515
24 x 1.75 1890
26 x 1.0 1953
26 x 1.5 2026
26 x 1.95 2051
26 x 1.75 2070
26 x 1.9 2089
26 x 2 2114
1 /
26 x 2 2133
8
2. Measure wheel diameter (more accurate):
Measure your wheel diameter (including wheel
and tire) in millimeters (1 inch = 25.4mm) and
FIGURE 1
multiply by 3.1416. This value is your wheel
circumference.
1x
3. Perform roll-out test (most accurate):
See Figure 2.
CIRCUMFERENCE
TIRE SIZE
STEP 1: Stand your bicycle upright. With your tires
16 x 1.75 1272
TIRE SIZE CIRCUMFERENCE
inflated to their normal riding pressure, rotate the
20 x 1.75 1590
front wheel so the valve stem is located at the 6
1
/ 3 /
27 x 1 24 x 1 2199 1948
8
4 o'clock position. Make a mark on the ground to
24 x 1.75 1907
indicate the valve location.
28 x 1.5 2224
26 x 0.75 1954
STEP 2: Roll the bicycle forward in a straight line
26 x 1.0 1973
28 x 1.75 2268
for one complete wheel revolution, until the valve
3 /
26 x 1 2105
8
stem is again at the bottom (ideally, you should
2026
26 x 1.5
1
/
28 x 1 2265
be on the bike). Make a mark on the ground to
2 26 x 1.6 2051
indicate the valve location.
26 x 1.75 2070
3 /
28 x 1 2205
8 STEP 3: Measure the distance between the marks
26 x 1.9 2089
in millimeters (1 inch = 25.4mm). This value is
26 x 2 2114
700 x 18c 2102
your wheel circumference.
1 /
26 x 2 2133
8
700 x 20c 2114
700 x 23c 2133
700 x 25c 2146
1x
Press to
Release
700 x 28c 2149
700 x 32c 2174
700 x 37c 2205
700 x 40c 2224
.
.
or
and ), to keep track of
TIRE SIZE CIRCUMFERENCE
1 /
27 x 1 2161
4
28 x 1.5 2224
700 x 18c 2102
700 x 23c 2096
700 x 25c 2105
700 x 28c 2136
700 x 32c 2155
700 x 35c 2168
700 x 38c 2180
CIRCUMFERENCE
TIRE SIZE
Distance in mm / inch
1 /
27 x 1 2199
4
28 x 1.5 2224
28 x 1.75 2268
1 /
28 x 1 2265
2
3 /
28 x 1 2205
8
700 x 18c 2102
700 x 20c 2114
OR
2133
700 x 23c
700 x 25c 2146
700 x 28c 2149
700 x 32c 2174
700 x 37c 2205
700 x 40c 2224
Distance in mm / inch
FIGURE 2

PROGRAM THE COMPUTER

Before using your Ascent IO, you must set the
clock, select a speed scale (miles or kilometers),
program wheel size, set the odometers (if desired),
select a temperature scale (°F or °C) and program
gender and weight.
MODE

SET THE CLOCK

The Ascent IO is equipped with a digital clock
that displays time of day in a 12 hour or 24 hour
format.
STEP 1: Press the MODE button to advance to
the Clock display screen (CLK). Then press and
hold the red SET button on the underside of the
computer to enter set-up mode. See Figure 3.
STEP 2: "12" or "24" will flash at the top of the
screen. Press the SET button to select 12 hour or
24 hour mode. Press the MODE button to confirm
your selection and advance to the hours setting.
STEP 3: The hours will flash. Press the SET button
(or press and hold) to advance the hours. If you
selected 12 hour mode, "PM" will appear for hours
between noon and midnight. Press the MODE
button to advance to the minutes setting.
STEP 4: The minutes will flash. Press the SET
button (or press and hold) to advance the minutes.
Press the MODE button to advance to the seconds
setting.
STEP 5: The seconds will flash. Press the SET
button to reset the seconds to "00". Press and hold
the MODE button to exit set-up mode.

SELECT SPEED SCALE

The Ascent IO is capable of displaying speed and
distance information in miles or kilometers.
STEP 1: Press the MODE button to advance to
the Odometer display screen (ODO). Then press
and hold the SET button on the underside of the
computer to enter set-up mode.
STEP 2: "M/H" or "KM/H" will flash in the display
screen. Press the SET button to select miles (M/H)
MAGNET
or kilometers (KM/H).
STEP 3: Press the MODE button to confirm your
SPOKE
selection and advance to the wheel size
WASHER
programming screen.
NUT
PROGRAM WHEEL SIZE AND ODOMETER (ODO1)
STEP 1: After the speed scale has been selected
(see above), the computer will automatically
advance to the wheel size selection screen. "
" " will flash at the top of the screen. 1mm-5mm
STEP 2: Press the SET button to select wheel size
. Press the MODE button to confirm your
selection and advance to the wheel size setting.
STEP 3: The left-most digit will flash. Press the SET
button to adjust the value according to the wheel
circumference determined above (see "Determine
Wheel Size"). Then press the MODE button to
advance to the next flashing digit.
STEP 4: Repeat this sequence until the correct
Bladed Round
wheel size has been entered. Then press the MODE
Spoke Spoke
button to advance to the odometer setting (ODO1)
for wheel size . (If you don't wish to program
the odometer, press the MODE button 5 times to
advance to the temperature scale selection screen,
Bladed Round
or press and hold the MODE button to exit set-up.) Spoke Spoke
STEP 5: The left-most digit will flash. Press the
SET button to adjust the value. Then press the
MODE button to advance to the next flashing digit.
STEP 6: Repeat this sequence until the odometer 3mm Max
value for wheel size has been set. Then press
the MODE button to advance to the temperature
scale selection screen, or press and hold the MODE
button to exit set-up.
SELECT TEMPERATURE SCALE
STEP 1: After the odometer has been set (see
above), the computer will automatically advance to
the temperature scale selection screen. "°F" or "°C"
will flash at the bottom of the screen.
STEP 2: Press the SET button to select Fahrenheit
3mm Max
SET
FIGURE 3
" or