2
7
Tire circumference
Tire circumference can be determined by either of the following two methods:
•
Measure the actual tire circumference (L)
After ensuring that the tire pressure is appropriate, sit on your
bike, roll it forward so that the tire makes one full revolution (use
the valve or other marking as a reference), and measure the dis-
tance traveled on the road.
•
Tire size chart
* The tire size or ETRTO code is indicated on the side of the tire.
ETRTO
Tire size
L (cm)
40-254
14x1.50
102
47-254
14x1.75
106
40-305
16x1.50
119
47-305
16x1.75
120
54-305
16x2.00
125
28-349
16x1-1/8
129
37-349
16x1-3/8
130
32-369
17x1-1/4 (369)
134
40-355
18x1.50
134
47-355
18x1.75
135
32-406
20x1.25
145
35-406
20x1.35
146
40-406
20x1.50
149
47-406
20x1.75
152
50-406
20x1.95
157
28-451
20x1-1/8
155
37-451
20x1-3/8
162
37-501
22x1-3/8
177
40-501
22x1-1/2
179
47-507
24x1.75
189
50-507
24x2.00
193
54-507
24x2.125
197
25-520
24x1(520)
175
24x3/4 Tubular
179
28-540
24x1-1/8
180
32-540
24x1-1/4
191
25-559
26x1(559)
191
32-559
26x1.25
195
37-559
26x1.40
201
40-559
26x1.50
201
47-559
26x1.75
202
50-559
26x1.95
205
54-559
26x2.10
207
57-559
26x2.125
207
58-559
26x2.35
208
75-559
26x3.00
217
ETRTO
Tire size
L (cm)
28-590
26x1-1/8
197
37-590
26x1-3/8
207
37-584
26x1-1/2
210
650C Tubular 26x7/8
192
20-571
650x20C
194
23-571
650x23C
194
25-571
650x25C 26x1(571)
195
40-590
650x38A
213
40-584
650x38B
211
25-630
27x1(630)
215
28-630
27x1-1/8
216
32-630
27x1-1/4
216
37-630
27x1-3/8
217
40-584
27.5x1.50
208
50-584
27.5x1.95
209
54-584
27.5x2.1
215
57-584
27.5x2.25
218
18-622
700x18C
207
19-622
700x19C
208
20-622
700x20C
209
23-622
700x23C
210
25-622
700x25C
211
28-622
700x28C
214
30-622
700x30C
215
32-622
700x32C
216
700C Tubular
213
35-622
700x35C
217
38-622
700x38C
218
40-622
700x40C
220
42-622
700x42C
222
44-622
700x44C
224
45-622
700x45C
224
47-622
700x47C
227
54-622
29x2.1
229
56-622
29x2.2
230
60-622
29x2.3
233
Setting up the computer
L cm
