31
Changing the
computer
configuration
Selecting the sensor
Select the sensor for which to set the tire
circumference.
MODE
ISC:1
(Speed/cadence sensor 1)
SP:1
(Speed sensor 1)
ISC:2
(Speed/cadence sensor 2)
SP:2
(Speed sensor 2)
* The sensor in use appears first.
*
ISC:2
and
SP:2
are used when a computer
is used for two different bicycles. For de-
tails, see “Pairing the sensor” (page 32).
Setting the tire circumference
This setting is required when you performed pairing with the
ANT+ speed sensor or speed/cadence (ISC) sensor.
Assign the tire circumference to the speed sensor or speed/cadence
sensor for pairing.
MENU
Entering the tire circumference
Setting range: 0100 - 3999 mm
MODE
Increase the value
MODE
Move digits
(press & hold)
Tire circumference
You can find the tire circumference (L) of your tire size in the chart below, or actually mea-
sure the tire circumference (L) of your bicycle.
How to measure the tire circumference (L)
For the most accurate measurement, do a wheel roll out. With the
tires under proper pressure, place the valve stem at the bottom.
Mark the spot on the floor and with the rider’s weight on the bike,
roll exactly one wheel revolution in a straight line (until the valve
comes around again to the bottom). Mark where the valve stem
is and measure the distance.
* Measure the tire to which the sensor is installed.
Tire circumference reference table
* Generally, the tire size or ETRTO is indicated on the side of the tire.
ETRTO
Tire size
L (mm)
47-203 12x1.75
935
54-203 12x1.95
940
40-254 14x1.50
1020
47-254 14x1.75
1055
40-305 16x1.50
1185
47-305 16x1.75
1195
54-305 16x2.00
1245
28-349 16x1-1/8
1290
37-349 16x1-3/8
1300
32-369 17x1-1/4(369)
1340
40-355 18x1.50
1340
47-355 18x1.75
1350
32-406 20x1.25
1450
35-406 20x1.35
1460
40-406 20x1.50
1490
47-406 20x1.75
1515
50-406 20x1.95
1565
28-451 20x1-1/8
1545
37-451 20x1-3/8
1615
37-501 22x1-3/8
1770
40-501 22x1-1/2
1785
47-507 24x1.75
1890
50-507 24x2.00
1925
54-507 24x2.125
1965
ETRTO
Tire size
L (mm)
25-520 24x1(520)
1753
24x3/4 Tubular
1785
28-540 24x1-1/8
1795
32-540 24x1-1/4
1905
25-559 26x1(559)
1913
32-559 26x1.25
1950
37-559 26x1.40
2005
40-559 26x1.50
2010
47-559 26x1.75
2023
50-559 26x1.95
2050
54-559 26x2.10
2068
57-559 26x2.125
2070
58-559 26x2.35
2083
75-559 26x3.00
2170
28-590 26x1-1/8
1970
37-590 26x1-3/8
2068
37-584 26x1-1/2
2100
650C Tubular
26x7/8
1920
20-571 650x20C
1938
23-571 650x23C
1944
25-571 650x25C
26x1(571)
1952
40-590 650x38A
2125
ETRTO
Tire size
L (mm)
40-584 650x38B
2105
25-630 27x1(630)
2145
28-630 27x1-1/8
2155
32-630 27x1-1/4
2161
37-630 27x1-3/8
2169
18-622 700x18C
2070
19-622 700x19C
2080
20-622 700x20C
2086
23-622 700x23C
2096
25-622 700x25C
2105
28-622 700x28C
2136
30-622 700x30C
2146
32-622 700x32C
2155
700C Tubular
2130
35-622 700x35C
2168
38-622 700x38C
2180
40-622 700x40C
2200
42-622 700x42C
2224
44-622 700x44C
2235
45-622 700x45C
2242
47-622 700x47C
2268
54-622 29x2.1
2288
60-622 29x2.3
2326
L mm
L mm
or
MODE
MODE
MODE
MODE
To “Pairing the sensor” (page 32)
From “Clock setting” (page 29)
(press
& hold)
(press & hold)
(press & hold)
Changing
the settings
Register
the setting
