In which part of the bike a left-handed screw is used?

seat
steering
pedals
rear sprockets
For bicycle pedals, the screw on the right must be reverse-threaded, or the pedal will unscrew during use, being subject to counterclockwise torque (which would work to undo a right-hand thread).
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Answers by country

seat
steering
pedals
rear sprockets
answers
flagRussia
3%
0%
68%
24%
29
flagthe Netherlands
2%
9%
67%
18%
43
flagNorway
0%
2%
66%
30%
39
flagthe United Arab Emirates
0%
15%
65%
20%
20
flagItaly
4%
4%
64%
28%
25
flagMalaysia
10%
0%
60%
30%
20
flagthe United Kingdom
2%
6%
59%
29%
344
flagGermany
5%
6%
57%
31%
128
flagPoland
3%
7%
55%
32%
11095
flagSwitzerland
10%
20%
55%
15%
20
flagAustralia
3%
9%
54%
32%
31
flagRepublic of Ireland
3%
23%
50%
23%
30
flagPakistan
0%
11%
50%
38%
26
flagCzech Republic
0%
5%
50%
40%
20
flagUkraine
12%
14%
48%
21%
41
flagthe United States
4%
9%
47%
36%
552
flagIndia
6%
14%
47%
28%
365
flagthe Philippines
12%
12%
45%
30%
33
flagUnknown
5%
9%
40%
45%
535
flagCanada
4%
4%
29%
59%
47