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Harley-Davidson Street Bob (2014-2021) — Maintenance Specs

The Street Bob (FXDB) lived two lives: a Dyna Glide with the Twin Cam 103 from 2014 until H-D retired the Dyna line in 2017, then a completely new Softail-chassis FXBB with Milwaukee-Eight 107 from 2018. The change rewrote the maintenance sheet - oil nearly doubled from 2.8 L to 4.73 L with the filter, the tank shrank from 17.8 L to 13.25 L, and the skinny 100/90-19 front tire went from 30 psi to the Softail line's 36 psi norm. This entry records both generations with per-year conditions from the official 2015 Dyna and 2019 Softail owner's manuals. The bobber styling, mini-apes (2018+) and two-up capability stayed constant through 2021.

Quick specs

Oil capacity (with filter) 2.8 Loil tank with filter (3.0 US qt) - FXDB Dyna 2014-2017 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Oil type Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Oil viscosity SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Front tire pressure (solo) 30 psi206 kPa cold FXDB; 36 psi (248 kPa) on FXBB 2018+ 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Rear tire pressure (solo) 40 psi276 kPa cold 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Spark plug H-D 6R12 (Dyna Twin Cam)HD-6R12 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Spark plug gap 0.97-1.09 (Twin Cam) / 0.80-0.90 (Milwaukee-Eight) mm 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Fuel capacity 17.8 L4.7 US gal FXDB 2014-2017; 13.25 L (3.5 gal) on FXBB 2018-2021 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Maintenance schedule

Specification Value Source
Engine oil & filter 1,000 mi first service, then every 5,000 mi (8,000 km) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Spark plug replacement every 30,000 mi (48,000 km) or 2 years 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Brake fluid change every 2 years 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Fluids & capacities

Specification Value Source
Oil capacity (with filter) 2.8 Loil tank with filter (3.0 US qt) - FXDB Dyna 2014-2017 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Oil type Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Oil viscosity SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Final drive oil transmission 0.95 L (1.0 qt); primary chaincase 0.95 L (1.0 qt) on Dyna; primary 1.18 L (1.25 qt) on 2018+ Softail Lapproximate 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Brake fluid type (DOT) DOT 4 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Fuel capacity 17.8 L4.7 US gal FXDB 2014-2017; 13.25 L (3.5 gal) on FXBB 2018-2021 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Torque specs

Specification Value Source
Spark plug 16.3-24.4 (TC) / 9.5-12.2 (M8) Nu00b7m 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Electrical

Specification Value Source
Battery 12V, 19 Ah, sealed maintenance-free (Dyna) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Headlight bulb H4 60/55 W (H-D P/N 68329-03) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Spark plug H-D 6R12 (Dyna Twin Cam)HD-6R12 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Spark plug gap 0.97-1.09 (Twin Cam) / 0.80-0.90 (Milwaukee-Eight) mm 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Tires & wheels

Specification Value Source
Front tire size 100/90B19, Michelin Scorcher 31 (FXDB) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Rear tire size 160/70B17, Michelin Scorcher 31 (FXDB) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Front tire pressure (solo) 30 psi206 kPa cold FXDB; 36 psi (248 kPa) on FXBB 2018+ 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)
Rear tire pressure (solo) 40 psi276 kPa cold 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal)

Official manual

Owner's manual on Harley-Davidson official site

Opens the manufacturer’s official website in a new tab.

Frequently asked questions

How much oil does a Street Bob take?
2.8 L (3.0 qt) on 2014-2017 Dyna models; 4.73 L (5.0 qt) on 2018-2021 Softail FXBB - both with the filter.
What is the Street Bob tire pressure?
30 psi front / 40 psi rear (206/276 kPa) on the FXDB; 36/40 psi on the 2018+ FXBB.
What oil does a Street Bob use?
H-D 360 SAE 20W-50 (SYN3 acceptable) across both generations.
What spark plug does a Street Bob use?
H-D 6R12 on Twin Cam models; the Milwaukee-Eight manual lists only 10 mm size and 0.80-0.90 mm gap.

Sources

Value Source Checked
Oil capacity (with filter): 2.8 L 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Oil type: Harley-Davidson H-D 360 (Screamin' Eagle SYN3 full synthetic acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Engine Lubrication, oil recommendation chart) 2026-11-03
Oil viscosity: SAE 20W-50 (H-D 360 preferred; SYN3 acceptable) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Final drive oil: transmission 0.95 L (1.0 qt); primary chaincase 0.95 L (1.0 qt) on Dyna; primary 1.18 L (1.25 qt) on 2018+ Softail L 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Brake fluid type (DOT): DOT 4 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Fuel capacity: 17.8 L 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Engine oil & filter: 1,000 mi first service, then every 5,000 mi (8,000 km) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Spark plug replacement: every 30,000 mi (48,000 km) or 2 years 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Brake fluid change: every 2 years 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Spark plug: 16.3-24.4 (TC) / 9.5-12.2 (M8) Nu00b7m 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Battery: 12V, 19 Ah, sealed maintenance-free (Dyna) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Headlight bulb: H4 60/55 W (H-D P/N 68329-03) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Spark plug: H-D 6R12 (Dyna Twin Cam) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Spark plug gap: 0.97-1.09 (Twin Cam) / 0.80-0.90 (Milwaukee-Eight) mm 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Front tire size: 100/90B19, Michelin Scorcher 31 (FXDB) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Rear tire size: 160/70B17, Michelin Scorcher 31 (FXDB) 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Front tire pressure (solo): 30 psi 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
Rear tire pressure (solo): 40 psi 2015 Harley-Davidson Owner's Manual: Dyna Models, 99467-15 (H-D Service Information Portal) (p. Specifications; Capacities Table 14) 2026-11-03
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