SunTour Radius
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Category:  Rear Derailleurs
Name:  SunTour Radius
Brand:  SunTour
Primary Group:  Radius
Model:  RD-RA00
Years:  1990 - 1992
Country:  Japan
Weight:  261 grams (Actual), incl all h/w
Added By: JFischer on 12/03/07
Updated By: peterbman on 05/05/18
Additional Photos - click for full size
SunTour RadiusSunTour RadiusSunTour RadiusSunTour RadiusSunTour RadiusSunTour Radius
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Outer Plate MarkingsSunTour RadiusInner Plate MarkingsMaeda Japan VIA
MaterialAluminum AlloyDesign CategorySlant parallelogram
Attachment Bolt Size5mm Allen KeyCable Attachment Bolt Size5mm Allen Key
Shifting SystemsSunTour AccuShift
Friction
Cable AdjusterYes
Cage LengthShortMax Cog Size28
Max Chain Wrap28T spec. 57.5mm between cage centres  
General Information

Radius components between Suntour's competition level GPX groupset and it's 4050/Edge sport/recreation components.

The Radius can handle a bigger cog and wrap than most  - it is rated to 28/28 and can still do it when worn.  The cage is longer than most at 57.5mm, mine is OK with a triple front crank and 13-23T rear cog.

Steel inner swing plate and outer cage. Inner cage is GRP: Glass Reinforced Plastic.

Quality:Rarity:
 
 
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Resources:Reference & ChartsCatalogsExternal Resources
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
RadiusSunTour1990 - 1992, Sport & RecreationView 9 Components
Details:   Early 90's group (found in 92 catalog.)
Brand Information(click to expand)

SunTour (Maeda)

SunTour derailleurs have a two-letter date code. On rear derailleurs the code is stamped on the back side of the inner parallel arm. On front derailleurs it is stamped on the back side of the inner cage.

The first letter represents the year. Larry Osborn and I believe O (Oh) is 1972, V is 1979 and A is 1984. As with Shimano, the second letter is the month code, where A is January and L is December.

SunTour Year Code

N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
 
A
B
C
D
E
F
G
H
I
1984
1985
1986
1987
1988
1989
1990
1991
1992

SunTour Month Code

A
B
C
D
E
F
G
H
I
J
K
L
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

The earliest Suntour derailleur I have found with a code is marked OF. A rear derailleur marked OD (corresponding to April of 72) was reported by Leighton Walter. I have a bike that dates from between 1970 to 1972 that has the original SunTour derailleurs. These derailleurs do not have date codes on them, so I believe the coding started sometime between 1970 and April of 1972.

(source: vintage-trek.com)

 
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