Triumph Bonneville Owner's Handbook Manual page 120

Specifications
Electrical Equipment
Battery
Alternator
Headlight
Tail/Brake Light
Turn signal Lights
Frame
Rake
Trail
Tightening Torques
Oil Filter
Sump Drain Plug
Spark Plug
Fluids and Lubricants
Engine Oil
Brake and Clutch Fluid
Bearings and Pivots
Drive Chain
120
Thruxton
12V 10 Ah
23A @ 2,000 rpm
25A @ 4,000 rpm
12V 60/55W
Halogen H4
12V 5/21W
12V 21W
27°
3.8 in (97 mm)
7 lbf ft (10 Nm)
18 lbf ft (25 Nm)
15 lbf ft (20 Nm)
Semi or fully synthetic 10W/40 or 10W/50
motorcycle engine oil which meets specification
API SH (or higher) and JASO MA, such as Castrol
Power 1 Racing 4T 10W-40 (fully synthetic) engine
oil, sold as Castrol Power RS Racing 4T 10W-40
(fully synthetic) in some countries.
DOT 4 Brake and Clutch Fluid
Grease to NLGI 2 specification
Chain spray suitable for O-ring chains
Scrambler
12V 10 Ah
23A @ 2,000 rpm
25A @ 4,000 rpm
12V 60/55W
Halogen H4
12V 5/21W
12V 10W
27.8°
4. 1 in (105 mm)
7 lbf ft (10 Nm)
18 lbf ft (25 Nm)
15 lbf ft (20 Nm)