OTHER FUNCTIONS
SPEED COMPARISON (+/-)
Compares current speed to average speed. As you
ride, a (+) or (-) will appear in both display screens to
indicate whether your current speed is above (+) or
below (-) your average speed. This function is automat-
ic, requires no programming and cannot be disabled.
SPEED TENDENCY ICON
The wheels on the bicycle icon roll forward to indicate
acceleration and backward to indicate deceleration.
AUTO SLEEP
To prolong battery life, the 4LW will automatically enter
“sleep” mode after 5 minutes of non-use. The comput-
er will automatically restart when it receives input from
the speed sensor, or when any button is pressed.
PROGRAMMING THE COMPUTER
Before using your Ascent
®
4LW cyclocomputer, you
must program wheel size, select a speed scale (Miles
or Kilometers), select a clock mode (12H or 24H) and
set the clock. The first step is to determine wheel size.
DETERMINING WHEEL SIZE
The Ascent
®
4LW uses wheel circumference (measured
in millimeters) to calculate speed and distance. Note that
while your computer can be programmed to +/-1mm for
total accuracy, discrepancies of as much as 50mm will
not have a significant effect on the accuracy of the unit for
most normal rides. The following chart lists the program-
ming sizes for some of the most popular tire sizes cur-
rently 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
Circ. (mm)
24 x 1.75
1888
26 x 1.4
1995
26 x 1.5
2030
26 x 1.75
2045
26 x 2
2099
Tire Size
Circ. (mm)
650c
2073
700 x 25
2124
700 x 28
2136
700 x 32
2155
