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Harley-Davidson Street Bob: Dyna and Softail generations, engines, and what to check
The Harley-Davidson Street Bob is a minimalist 'bobber' style motorcycle with a large V-twin engine. We look at the Dyna (2006–2017) and Softail (from 2018) generations, engine options, and what to check when buying used.
Street Bob in brief
The Street Bob was designed as a simple and lightweight 'custom' motorcycle: minimal chrome, blacked-out components, a low-slung handlebar, and a distinctive V-twin character. It's a popular alternative for those who love the Harley-Davidson style but don't need a full-blown touring bike.
Many used examples have been customised: handlebars, exhaust systems, seats, and lights swapped out. This can be an advantage (already tailored to the buyer) or a risk if the modifications are poorly done.
Generations — what's the difference
The Dyna Street Bob (2006–2017) uses the Dyna frame with twin rear shocks and 'Twin Cam' engines (96 and later 103 cubic inches). It's the classic version with a pronounced vibration character and relatively easy handling.
The Softail Street Bob (from 2018) got a new frame, a single hidden rear shock, and modern 'Milwaukee-Eight' engines (107 and later 114 cubic inches). The motorcycle is lighter, stiffer, and more precise on the road, although the exterior remains similar.
Engines and transmission
In the Dyna generation — 'Twin Cam' V-twin: 96 cubic inches (approx. 1584 cc) and later 103 cubic inches (approx. 1690 cc). In the Softail generation — 'Milwaukee-Eight': 107 cubic inches (approx. 1746 cc), later — 114 cubic inches (approx. 1868 cc).
Gearbox — 6-speed manual, rear-wheel drive — toothed belt, so no chain maintenance required. Newer generations have an electronic throttle and auxiliary systems, depending on the year.
What to check when buying a used Street Bob
Check for modifications: steering, exhaust system, seat, lights, and parts that may have been changed. Ensure modifications don't alter driving characteristics and that they have the necessary documents.
The engine should run smoothly, without leaks over the cylinder heads and the main gasket. For the Dyna, ask about the replacement of the Twin Cam distribution chains and their tensioners when the motorcycle has high mileage.
Check the belt (wear, cracks), brakes, wheel bearings, and tyres. It's crucial that the battery holds charge and the electrical system works without faults.
Trim levels and versions
Names and equipment vary by market and year; below are the main generations.
Dyna Street Bob
2006–2017Classic version with Dyna frame and Twin Cam engine.
- 96 or later 103 cu. in. Twin Cam engine
- Two rear shock absorbers
- Often — modified steering and exhaust
Softail Street Bob 107
From 2018New frame design and Milwaukee-Eight engine.
- 107 cu. in. Milwaukee-Eight engine
- Hidden rear shock absorber
- Often — ABS and electronic stability control
Softail Street Bob 114
From 2021A more powerful version with a larger engine.
- 114 cubic inch Milwaukee-Eight engine
- Wider power range
- Often — additional driver-assistance systems
Street Bob generation comparison
| Dyna (2006–2017) | Softail 107 | Softail 114 | |
|---|---|---|---|
| Who it's for | For fans of classic style | For daily and leisure riding | For those who need more power |
| Engine | 96 or 103 cubic inch Twin Cam | 107 cubic inch Milwaukee-Eight | 114 kub. col. Milwaukee-Eight |
| Price in the used market (relatively) | €€ | €€€ | €€€ |
Budget pick — a well-maintained Dyna Street Bob. If you're after a more modern frame and engine, consider a Softail instead.
Pros
- Distinctive, recognizable Harley-Davidson style
- Plenty of options to customize to your liking
- Belt drive — low maintenance
- Simple tech, plenty of parts and accessories
Cons
- Refurbished motorcycles can hide issues
- Minimal wind protection for longer rides
- Higher price than similar Japanese bikes
Frequently asked questions
What's the difference between the Dyna and Softail Street Bob?
The Dyna has two rear shocks and a Twin Cam engine, while the Softail features a new frame with a hidden shock and a Milwaukee-Eight engine. The Softail is more modern and precise on the road.
Is the Street Bob suitable for a beginner?
If you have an A category licence and some experience, you can consider this, but it's quite a large and heavy motorcycle. Beginners should evaluate the weight and power.
Is the Street Bob suitable for long journeys?
Not really — it lacks wind protection, and the seat is minimal. For longer trips, a front windshield and saddlebags are often added.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
