MotoSpecs

2017 Harley-Davidson Dyna Street Bob vs 2018 Triumph Bonneville Speedmaster

Full specifications comparison • 2 motorcycles

Comparing 2 motorcycles
2017 Harley-Davidson Dyna Street Bob 2017 Harley-Davidson Dyna Street Bob

Custom / cruiser

Engine
Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler
Power
N/A
Top Speed
N/A
Weight
304.0 kg / 670 lbs
2018 Triumph Bonneville Speedmaster 2018 Triumph Bonneville Speedmaster

Custom / cruiser

Engine
Four stoke, parallel twin, 270o crank, SOHC
Power
57.4 kW / 77 hp @ 6550 rpm
Top Speed
N/A
Weight
245.5kg / 540 lbs
Full Specifications
General
Year2016 - 172018
Make ModelHarley Davidson Dyna Street BobTriumph Bonneville Speedmaster
Dimensions
Seat HeightLaden 648 mm / 25.5 in. Unladen 680 mm / 26.8 in.705 mm / 27.7 in
Wheelbase1630 mm / 64.2 in-
Ground Clearance120mm / 4.7 in-
Length2395 mm / 94.3 in-
Weights & Capacities
Dry Weight291 kg / 642 lbs245.5kg / 540 lbs
Fuel Capacity17 8 Litres / 4.7 US gal12 Litres / 3.17 US gal
Maximum Load / GVWR492.2 kg / 1085 lbs-
Oil Capacity2.8 Litres / 3.0 US qt-
Wet Weight304.0 kg / 670 lbs-
Performance
Max Power-57.4 kW / 77 hp @ 6550 rpm
Max Torque130 Nm / 13.3 kgf-m / 95.9 ft-lb @ 3000 rpm106 Nm / 10.7 kgf-m / 77.4 lb-ft @ 3100 rpm
Engine
Displacement1690 cc / 103.1 cu in1198 cc / 73.1 cu in
Engine DetailFour stroke, V-Twin, Twin Cam 103° with integrated oil coolerFour stoke, parallel twin, 270o crank, SOHC
Bore x Stroke98.4 x 111.1 mm97.6 x 80 mm
Compression Ratio9.6:110.0:1
Cooling SystemAir cooledLiquid cooled
ExhaustChrome, staggered, shorty exhaust with dual tapered mufflersStraight line stainless steel twin-skin slash cut twin stubby silencers
Fuel InductionElectronic Sequential Port Fuel Injection (ESPFI)Multipoint sequential electronic fuel injection
IgnitionSingle-fire, non-wasted, map-controlled spark ignitionDigital
Lubrication-Wet sump
StarterElectric-
Drivetrain
Clutch-Wet, multi-plate
Final DriveBeltChain, X-ring
Gear Ratios1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.79:1-
Primary DriveChain, 34/46 ratio-
Transmission / Drive6 Speed 6-Speed
Chassis
Frame TypeMild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG weldedDual tubular steel cradle
Suspension - Front49 mm with polished aluminum fork triple clamp and dual-rate springs,41 mm Kayaba fork
Suspension - RearCoil over shockKayaba twin shocks with adjustable preload
Lean Angle31°-
Rake29°-
Trail120 mm / 4.7 in-
Wheel Travel - Front-90 mm / 3.5 in
Wheel Travel - Rear-73 mm / 2.8 in
Wheels & Brakes
Brakes - FrontSingle 300mm disc, 4 piston caliper, fixed2 x 310 mm Disc, 2 piston calipers, ABS
Brakes - RearSingle 292mm disc, 2 piston caliper, floatingSingle 255 mm disc, 2 piston caliper, ABS
Tyres - Front100/90-B19 57H130/90-16
Tyres - Rear160/70-B17 73V150/80-16
Wheels-Wire 32-spoke, steel rims
Wheels - FrontBlack steel, laced-
Wheels - RearBlack steel, laced-

Verdict

Winner on specs

2017 Harley-Davidson Dyna Street Bob

The 2017 Harley-Davidson Dyna Street Bob edges out the 2018 Triumph Bonneville Speedmaster thanks to its higher torque, larger fuel tank, lower seat height and larger displacement. Specifications are one part of the picture - dealer support, parts availability, and intended use all matter too.

Key Differences

2017 Harley-Davidson Dyna Street Bob - Advantages

  • Higher torque: 130 Nm vs 106 Nm - more pulling power across the rev range.
  • Larger fuel tank: More range between stops - an advantage on touring routes and remote roads.
  • Lower seat height: Laden 648 mm vs 705 mm - accessible to a wider range of rider heights.
  • Larger displacement: 1690 cc vs 1198 cc - more cubic capacity means broader torque delivery and greater low-end pull.

2018 Triumph Bonneville Speedmaster - Advantages

  • Liquid cooling: Consistent engine temperature in stop-start traffic and hot climates.
  • Dual front discs: Greater stopping power and better heat management under hard braking.

2017 Harley-Davidson Dyna Street Bob vs 2018 Triumph Bonneville Speedmaster - FAQs

What are the engine differences between the 2017 Harley-Davidson Dyna Street Bob and 2018 Triumph Bonneville Speedmaster?
The 2017 Harley-Davidson Dyna Street Bob uses Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler, while the 2018 Triumph Bonneville Speedmaster is powered by Four stoke, parallel twin, 270o crank, SOHC.
Which bike is better for shorter riders, the 2017 Harley-Davidson Dyna Street Bob or the 2018 Triumph Bonneville Speedmaster?
The 2017 Harley-Davidson Dyna Street Bob has the lower seat at Laden 648 mm, making it more accessible. The 2018 Triumph Bonneville Speedmaster sits higher at 705 mm. A seat height below 800 mm suits most riders; above 820 mm shorter riders may need to tiptoe.
Which has the larger fuel tank, the 2017 Harley-Davidson Dyna Street Bob or the 2018 Triumph Bonneville Speedmaster?
The 2017 Harley-Davidson Dyna Street Bob has the larger tank at approximately 17 litres vs 12 litres for the 2018 Triumph Bonneville Speedmaster. At 5-6 l/100 km that is roughly 283-340 km vs 200-240 km between stops.
Which should I buy, the 2017 Harley-Davidson Dyna Street Bob or the 2018 Triumph Bonneville Speedmaster?
Both are strong choices. The 2017 Harley-Davidson Dyna Street Bob has the edge in higher torque and larger fuel tank, while the 2018 Triumph Bonneville Speedmaster stands out for liquid cooling and dual front discs. Visit dealers, arrange test rides, and factor in local parts and service costs - these often matter as much as the spec sheet.

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