The 2026 Harley-Davidson® Street Bob® is engineered as a performance-focused cruiser that integrates a large-displacement V-twin engine, a rigid yet balanced chassis, advanced braking systems, and essential electronic rider aids. Its specifications reflect a deliberate focus on torque delivery, structural stability, and controlled handling. Every measurable component, from engine displacement to suspension travel, contributes to a motorcycle designed for predictable output and consistent performance.
Milwaukee-Eight® 117 Classic Engine Specifications
The 2026 Harley-Davidson® Street Bob® is equipped with the Milwaukee-Eight® 117 Classic engine. This powertrain features a displacement of 117 cubic inches, equivalent to 1,923 cubic centimeters. The bore measures 4.075 inches, and the stroke measures 4.5 inches. The compression ratio is set at 10.3 to 1, balancing combustion efficiency with durability.
This engine produces 120 foot-pounds of torque at 2,500 rpm under J1349 testing standards. Peak output reaches 98 horsepower, equivalent to 73 kilowatts, at 4,600 rpm. The torque curve emphasizes low- and mid-range response, ensuring strong acceleration from lower engine speeds.
The valvetrain uses pushrod-operated overhead valves with hydraulic, self-adjusting lifters. Each cylinder contains four valves. This configuration supports reliable valve timing and reduces manual adjustment requirements. Fuel delivery is handled by Electronic Sequential Port Fuel Injection, which meters fuel precisely according to throttle input and engine demand. The recommended fuel rating is 91 octane or higher.
Air intake flows through a 9-inch round air cleaner featuring a center bolt cover and washable fiberglass filter media. Exhaust gases exit through a 2-into-1 exhaust system with a catalyst integrated into the header assembly. The lubrication system is a pressurized dry sump with an oil cooler, supporting temperature regulation during extended operation.
Drivetrain and Transmission Dynamics
The primary drive uses a chain with a 34 to 46 ratio. The final drive is belt-driven with a 32 to 66 ratio. This configuration supports efficient torque transfer and reduced maintenance compared to shaft-driven systems.
The clutch is a mechanical, 10-plate wet design with assist and conventional operation. This arrangement reduces lever effort while maintaining positive engagement. Power is routed through a 6-Speed Cruise Drive® transmission.
The overall gear ratios are 9.311 in first gear, 6.454 in second gear, 4.793 in third gear, 3.882 in fourth gear, 3.307 in fifth gear, and 2.79 in sixth gear. The lower gears provide strong acceleration, while sixth gear reduces engine rpm during highway travel. The spacing between ratios ensures progressive power delivery across varying speeds.
Frame Construction and Structural Geometry
The chassis consists of a mild steel tubular frame with a rectangular-section backbone. The structure incorporates stamped, cast, and forged junctions joined by MIG welding. Aluminum-forged fender supports contribute to weight efficiency.
The swingarm is constructed from mild steel tubular sections with a stamped cross-member and forged axle junctions. It is MIG-welded and includes a removable belt spacer.
The motorcycle measures 91.3 inches in length, 36.4 inches in overall width, and 45.7 inches in overall height. The wheelbase is 64.2 inches. The rake is set at 30 degrees, and the trail measures 6.2 inches. This geometry promotes straight-line stability and consistent steering response.
Static ground clearance measures 4.9 inches. The lean angle is 28.5 degrees on both the right and left sides under J1168 testing standards. These figures indicate predictable cornering limits within the cruiser category.
The seat height is 25.8 inches when laden and 26.8 inches when unladen, based on a 180-pound operator measurement. This low seat height supports stable footing during stops. The weight as shipped is 622 pounds. Weight in running order is 646 pounds. Gross Vehicle Weight Rating is 1,160 pounds, with a front Gross Axle Weight Rating of 450 pounds and a rear rating of 730 pounds.
Suspension Components and Travel Measurements
The front suspension uses a 49 mm dual-bending valve telescopic fork. The fork includes aluminum triple clamps and dual-rate springs. Gaiter covers protect the fork tubes from debris. Front suspension travel measures 5 inches.
The rear suspension features a hidden, free-piston, coil-over monoshock with a 43 mm stroke. Cam-style preload adjustment allows the rider to modify spring tension according to load conditions. Rear suspension travel measures 3.4 inches.
This configuration maintains a clean hardtail-style appearance while delivering modern shock absorption. The dual-bending valve fork improves front-end compliance over uneven pavement.
Wheels and Tire Configuration
The standard wheel setup includes black Annihilator cast aluminum wheels. The front wheel measures 19 inches in diameter and 2.5 inches in width. The rear wheel measures 16 inches in diameter and 3 inches in width. Optional painted aluminum tubeless laced wheels may vary by region.
The front tire is a Dunlop® Harley-Davidson® Series D401F with the specification 100/90B19, 57H, blackwall. The rear tire is a Dunlop® Harley-Davidson® Series D401T with the specification 150/80B16, 77H, blackwall. These bias-ply tires are engineered to balance durability and grip under typical cruiser operating conditions.
Braking Hardware and Control Systems
The front brake uses a 4-piston fixed caliper paired with a single 11.8-inch solid rotor with a thickness of 0.2 inches. The rear brake uses a 2-piston floating caliper with an 11.5-inch solid rotor measuring 0.23 inches in thickness. The front configuration is single-disc.
The anti-lock braking system is standard equipment. The motorcycle also integrates a Traction Control System and a Drag-Torque Slip Control System. The Tire Pressure Monitoring System is included.
Cornering-specific systems enhance stability under lean. These include Cornering Enhanced Anti-Lock Braking System, Cornering Enhanced Traction Control System, and Cornering Drag-Torque Slip Control System. These systems adjust braking force and torque modulation based on lean angle data, helping maintain control during cornering maneuvers.
Electronic Linked Braking and Vehicle Hold Control are not included. Wheel lift mitigation is also not included. The braking package prioritizes direct rider input combined with electronic assistance calibrated for stability.
Electrical Output and Charging Capacity
The 2026 Harley-Davidson® Street Bob® uses a sealed, maintenance-free absorbed glass mat battery rated at 12 volts, 17.5 amp-hours, and 310 cold cranking amps at 0 degrees Fahrenheit. Charging is handled by a three-phase 48-amp system. Output measures 364 watts at 13 volts and 900 rpm, with a maximum of 624 watts at 13 volts and 2,000 rpm.
The starting system uses a 1.6-kilowatt electric starter with solenoid shift motor engagement. This output ensures reliable ignition under standard conditions.
The lighting is fully LED. The headlamp includes low beam, high beam, and signature position lamp functions. Tail, stop, and turn signals use LED bullet-style components. Front and rear turn signals are LED bullet units.
Instrumentation and Rider Interface
Instrumentation is centered around a 4-inch analog speedometer integrated with a digital display. The digital interface provides gear position, odometer, fuel level, ride modes, heated gear status, traction control status, ABS indicator, tire pressure monitoring system data, cruise control status, clock, trip information, range, and tachometer readout.
A USB-C power outlet supplies 5 volts at 2.4 amps, allowing device charging. No infotainment system, navigation, Bluetooth® connectivity, audio system, or intercom features are included. The configuration focuses strictly on operational data.
Fuel Capacity and Efficiency Data
Fuel capacity measures 3.5 gallons. A 1-gallon reserve warning light alerts the rider to low fuel level. Estimated fuel economy is 47 miles per gallon under city and highway testing conditions.
The oil capacity with the filter is 5 quarts. Transmission fluid capacity is 1 quart. The primary chain case capacity is 1.25 quarts. Coolant capacity is not applicable due to the air- and oil-cooled design.
Schedule a Test Ride Today
Riders seeking measurable torque output, a 6-Speed Cruise Drive® transmission, and cornering-enhanced safety systems can evaluate the 2026 Harley-Davidson® Street Bob® directly through a scheduled test ride. At Tower’s Baton Rouge Harley-Davidson® in Baton Rouge, LA, our team provides detailed demonstrations of the Milwaukee-Eight® 117 Classic engine performance and integrated braking technologies. Experiencing the 120 foot-pounds of torque at 2,500 rpm allows you to assess throttle response and acceleration firsthand. A test ride also highlights the stability created by the 30-degree rake, 64.2-inch wheelbase, and dual-bending valve suspension. Contact our dealership to arrange your ride and examine the engineering specifications of the 2026 Harley-Davidson® Street Bob® in person.
