|
ROAD RATIOS
The following chart is again based on a
700mm rim and a 23C tyre. The gear ratios are fairly common for today's 9
speed and 10 speed group sets. The ratios are based on front chain rings of
53 teeth and 39 teeth with a rear cluster from 11 to 25. Once again for amusement
I have included a cadence and speed field. The cadence selected
is again 165. It is interesting to note on line 1 of this chart that in
"big ring eleven" one would be doing 101kph.
Here's a bit of news for those of you that
think that cadences over 200 are unachievable:
" 44 year old Manfred Nüscheler has set a new speed record for
riding on stationary rollers, clocking 164.1 km/h in Berne, Switzerland on
September 16, 2000. The record was set using a 54x11 (10.49 m) gear on a
standard bike (Moser frame with Campagnolo gear) on Minoura rollers. The old
record was 160.4 km/h.
During the attempt, Nüscheler rode at between 269 and 284 rpm,
demonstrating that leg speed is not necessarily lost as one gets older."
|
Wheel/tyre |
Wheel Diametre (metres) |
Chain ring |
Rear Sprocket |
Roll out distance |
Gear in inches |
Cadence |
Speed kph |
|
700 x 23C |
0.674 |
53 |
11 |
10.20 |
130.1 |
165 |
101 |
|
700 x 23C |
0.674 |
53 |
12 |
9.35 |
119.3 |
165 |
93 |
|
700 x 23C |
0.674 |
53 |
13 |
8.63 |
110.1 |
165 |
85 |
|
700 x 23C |
0.674 |
53 |
14 |
8.02 |
102.2 |
165 |
79 |
|
700 x 23C |
0.674 |
53 |
15 |
7.5 |
95.4 |
165 |
74 |
|
700 x 23C |
0.674 |
53 |
16 |
7.014 |
89.4 |
165 |
69 |
|
700 x 23C |
0.674 |
53 |
17 |
6.60 |
84.2 |
165 |
65 |
|
700 x 23C |
0.674 |
53 |
18 |
6.23 |
79.5 |
165 |
62 |
|
700 x 23C |
0.674 |
53 |
19 |
5.90 |
75.3 |
165 |
58 |
|
700 x 23C |
0.674 |
53 |
20 |
5.61 |
71.6 |
165 |
56 |
|
700 x 23C |
0.674 |
53 |
21 |
5.34 |
68.1 |
165 |
53 |
|
700 x 23C |
0.674 |
53 |
22 |
5.10 |
65.0 |
165 |
51 |
|
700 x 23C |
0.674 |
53 |
23 |
4.88 |
62.2 |
165 |
48 |
|
700 x 23C |
0.674 |
53 |
24 |
4.68 |
59.6 |
165 |
46 |
|
700 x 23C |
0.674 |
53 |
25 |
4.49 |
57.2 |
165 |
44 |
|
700 x 23C |
0.674 |
39 |
11 |
7.51 |
95.7 |
165 |
74 |
|
700 x 23C |
0.674 |
39 |
12 |
6.88 |
87.8 |
165 |
68 |
|
700 x 23C |
0.674 |
39 |
13 |
6.35 |
81.0 |
165 |
63 |
|
700 x 23C |
0.674 |
39 |
14 |
5.9 |
75.2 |
165 |
58 |
|
700 x 23C |
0.674 |
39 |
15 |
5.50 |
70.2 |
165 |
55 |
|
700 x 23C |
0.674 |
39 |
16 |
5.16 |
65.8 |
165 |
51 |
|
700 x 23C |
0.674 |
39 |
17 |
4.86 |
61.9 |
165 |
48 |
|
700 x 23C |
0.674 |
39 |
18 |
4.59 |
58.5 |
165 |
45 |
|
700 x 23C |
0.674 |
39 |
19 |
4.35 |
55.4 |
165 |
43 |
|
700 x 23C |
0.674 |
39 |
20 |
4.13 |
52.7 |
165 |
41 |
|
700 x 23C |
0.674 |
39 |
21 |
3.9 |
50.1 |
165 |
39 |
|
700 x 23C |
0.674 |
39 |
22 |
3.75 |
47.9 |
165 |
37 |
|
700 x 23C |
0.674 |
39 |
23 |
3.59 |
45.8 |
165 |
36 |
|
700 x 23C |
0.674 |
39 |
24 |
3.44 |
43.9 |
165 |
34 |
|
700 x 23C |
0.674 |
39 |
25 |
3.30 |
42.1 |
165 |
33 |
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