
Model No
RD-R8150
Series
ULTEGRA
Rear speeds
12
RD construction
SHIMANO SHADOW RD
✔
Mount
Direct attachment (conventional)
✔
Direct mount
✔
Max. front difference
16T
Total capacity
39T
Low sprocket
Max.
34T
Min.
30T
Top sprocket
Max.
11T
Min.
11T
Fluoric coated link bushings
4
Pulley
Guide pulley bearing
✔
Tension pulley bearing
✔
Teeth
11
Sunken type pulley screw
✔
B-axle
Hollow axle
✔
B-axle 2
Hollow axle
✔
Di2 connectivity wired
Di2 shifting
✔
Di2 connectivity wireless
Di2 shifting
✔
Bluetooth® LE custom (*1)|Adjust mode information
✔
Bluetooth® LE custom (*1)|Di2 battery level
✔
Bluetooth® LE custom (*1)|Gear position
✔
Bluetooth® LE custom (*1)|SHIMANO E-BIKE SYSTEMS data items (*3)
✔
Bluetooth® LE custom (*1)|Compatible with E-TUBE RIDE
✔
Bluetooth® LE custom (*1)|Compatible with E-TUBE PROJECT
✔
ANT private (*2)|Adjust mode information
✔
ANT private (*2)|Di2 battery level
✔
ANT private (*2)|Gear position
✔
ANT private (*2)|SHIMANO E-BIKE SYSTEMS data items (*3)
✔
Firmware update by E-TUBE PROJECT
✔
SD50 port (pcs)
0
SD300 port (pcs)
1
SD50 connector (pcs)
0
SD300 connector (pcs)
0
LED for system status
✔
Charging cable
EW-EC300
Average weight
262
Remarks
w/o Bracket spec. available
Color
Series color