Shimano code system:
Shimano Year
A
|
1976
|
2002
|
B
|
1977
|
2003
|
C
|
1978
|
2004
|
D
|
1979
|
2005
|
E
|
1980
|
2006
|
F
|
1981
|
2007
|
G
|
1982
|
2008
|
H
|
1983
|
2009
|
I
|
1984
|
2010
|
J
|
1985
|
2011
|
K
|
1986
|
2012
|
L
|
1987
|
2013
|
M
|
1988
|
2014
|
N
|
1989
|
2015 |
O
|
1990
|
2016 |
P
|
1991
|
2017 |
Q
|
1992
|
2018 |
R
|
1993
|
2019 |
S
|
1994
|
2020 |
T
|
1995
|
2021 |
U
|
1996
|
2022 |
V
|
1997
|
2023 |
W
|
1998
|
|
X
|
1999
|
|
Y
|
2000
|
|
Z
|
2001
|
Shimano Month
A
|
January
|
B
|
Febuary
|
C
|
March
|
D
|
April
|
E
|
May
|
F
|
June
|
G
|
July
|
H
|
August
|
I
|
September
|
J
|
October
|
K
|
November
|
L
|
December
|
Mountain
XTR
M900 1992 8 Speed
• M910 1995
M950 1996 8 Speed
• M951 1998 8 Speed
• M952 1999 9 Speed
• M953 1999 9 Speed
M960 2003 9 Speed
• M965
M970
• M971
• M972 (Shadow)
M980 2011? 10 Speed
• M981
• M985
• M986
XT
M700 1983
M730 1987
M732 1989 6-Speed
M735 1990 7-speed
M737 1994 8-speed
M739 1996 8-speed
M750 1999 9-speed
• 751
M760 2004 9-speed
• 761
M770 2008 9-speed
• 771
• 772 (shadow)
• 773 (shadow)
M780 2011 10-speed
• 781
• 786
LX
M560 1993
• M563 ’94
• M565 ’95
• M567 ’96
M570
• M571
M580
• M581
SLX
M662
• M663
M670 2012
• M675
Road
Dura-Ace
7100 1973
7200 EX 1978
7300 AX 1980
7400 1984 6-Speed (1987 7-Speed) (1988 8 – Speed)
7600 1985 Track
7700 1996 9 – Speed
7800 2003 10 – Speed
7900 2008 10 – Speed (7970 ’09 Di2 10spd)
9000 2012 11 – Speed (9070 ’12 Di2 11spd) (7710 ’12 Track)
Ultegra (600)
6000 1974
6100 1976
6200 1978
6300 1981
6400 1988
6500 1997 9 – Speed
6600 2005 10 – Speed
6700 2009 10 – Speed (6770 ’11 Di2 10 – Speed)
105
5500
• 5501
5600
5700 2011 10 – Speed
• 5701