1. Motorcycle Frames Offers
  2. sku: 18156869067914663
  3. TRIUMPH SMT900K1XDT577900

TRIUMPH Frame Chassis Straight Cln SMT900K1XDT577900X

fits model: Bonneville. make: Triumph. year: 2008–2016.

Smt900k1xdt577900 Triumph 08-16 Bonneville Main Frame Chassis Straight Cln

( Manufacturer Part Number: SMT900K1XDT577900 ), ( Type: Frame Main Frame ), ( Country Of Origin: England ), ( Color: Black ), ( Manufacturer Warranty: Unspecified Length ), ( Placement On Vehicle: Center ), ( Storage Location: Z.4.b.1 T577900-o ), ( Custom1: 233436 ), ( Finish: Painted ), ( Material: Metal ), ( Machine Type: Street Motorcycle ), ( Vintage Part: No ), ( Oe/oem Part Number: T2075298 ), ( Ipn: Smt900k1xdt577900x )

Review TRIUMPH Main Frame Chassis Straight Cln fits BONNEVILLE 2008–2016

The **Triumph Bonneville SMT900K1XDT577900 (08-16 frame chassis, straight, CLN)** is a timeless masterpiece of British motorcycle engineering, blending raw mechanical heritage with modern refinement to create a machine that embodies the spirit of classic cruising with contemporary precision. Built upon the iconic **Triumph Bonneville** platform, this model represents the pinnacle of Triumph s commitment to craftsmanship, offering a seamless fusion of vintage aesthetics and cutting-edge technology. The **straight frame chassis** (08-16 model) is a hallmark of Triumph s design philosophy, featuring a **double-cradle construction** with a **steel backbone and subframe**, ensuring durability, stability, and a classic riding posture that invites long-distance comfort. The **CLN (Clean) specification** denotes a meticulously assembled model, free from any cosmetic imperfections, making it an ideal choice for riders who appreciate both form and function without compromise.

Under the hood, the **900cc parallel-twin engine** delivers a symphony of power and character, a legacy engine refined over decades to produce a smooth, torque-rich performance that thrives on open roads. With **95 horsepower and 60 lb-ft of torque**, this engine offers a balanced blend of low-end grunt and high-revving excitement, making it equally capable of effortless cruising at highway speeds or spirited acceleration when needed. The **desmodromic valve actuation system** ensures precise valve control, eliminating traditional valve float issues and contributing to the engine s legendary reliability and longevity. Paired with a **six-speed manual transmission** and a **chain final drive**, the drivetrain is both robust and efficient, delivering a direct and engaging connection between rider and road.

The **straight frame geometry** of the Bonneville SMT is designed for a relaxed, upright riding position, ideal for long-distance touring or casual cruising. The **36-inch front wheel and 4.5-inch rear wheel** provide a stable platform, while the **adjustable suspension** featuring **Triumph s proprietary 41mm front forks and rear shock absorber** adapts seamlessly to various road conditions, ensuring a plush yet controlled ride. The **single-disc front brake system** (with two-piston caliper) and **drum brake at the rear** offer reliable stopping power, though enthusiasts often opt for aftermarket upgrades for enhanced performance. The **chrome-plated fuel tank**, **dual exhaust system**, and **polished engine components** contribute to the machine s classic Bonneville look, exuding an air of timeless elegance that turns heads wherever it goes.

For those who value both heritage and modernity, the **SMT900K1XDT577900** is a near-perfect embodiment of Triumph s legacy, offering a motorcycle that is as much a conversation starter as it is a reliable companion on the road. Whether cruising along coastal highways, navigating city streets, or embarking on a cross-country adventure, this Bonneville delivers a riding experience that is equal parts nostalgic and innovative. With its **durable construction, refined engine, and classic styling**, it stands as a testament to Triumph s enduring reputation for building motorcycles that are as much about soul as they are about speed.

### **Pros and Cons of Buying a Triumph SMT900K1XDT577900 (2008 2016 Bonneville Frame/Chassis, Straight, CLN)**

#### **Pros**

1. **Classic Bonneville Design** The straight-frame Bonneville is an iconic American cruiser with a timeless, aggressive stance. Its low-slung, wide seat and chrome detailing give it a retro-modern appeal that many riders appreciate.

2. **Powerful and Reliable Engine** The 900cc parallel-twin engine (based on the Triumph Trident) produces around **60 70 hp** (depending on modifications) and **55 60 lb-ft of torque**, making it smooth and capable for both highway cruising and spirited riding. The engine is known for its durability, especially with proper maintenance.

3. **Comfortable for Long Rides** The straight frame and ergonomics are designed for relaxed, upright riding, reducing neck and back strain compared to some sportier bikes. The wide seat and adjustable windscreen (on later models) help with comfort on long journeys.

4. **Modular and Upgradable** The Bonneville s design allows for extensive customization. Owners can upgrade the engine (e.g., with a **Trident kit** for more power), suspension (e.g., **WP X39 or Showa** forks), exhaust (e.g., **Akrapovic or Magna** for better sound and performance), and wheels (e.g., **cast or spoked alloys** for better handling).

5. **Strong Aftermarket Support** Triumph s Bonneville has a large and active aftermarket community. Parts like **exhausts, air filters, and ECU tunes** are widely available, and many riders share modifications online (forums like **Triumph Bonneville Owners Club** or **Motorcycle.com**).

6. **Good Fuel Economy for Its Class** At around **40 50 mpg** (varies with riding style and modifications), it s more efficient than many heavy cruisers or sportbikes, making it practical for daily use.

7. **Resale Value** Well-maintained examples hold their value reasonably well, especially if they have a clean service history. The **CLN (Clean) designation** (no major modifications) helps retain originality.

8. **Riding Position Suits Many Riders** Unlike aggressive sportbikes, the Bonneville s upright position is easier on the rider s back and wrists, making it a good choice for those who dislike hunched-over riding.

9. **Sound and Character** The stock engine has a deep, throaty growl that many riders enjoy. With aftermarket exhausts, it can become even more aggressive without losing its classic tone.

10. **Proven Reliability (With Maintenance)** The **900cc engine** is robust if kept up. Common issues (like **valve train wear** or **oil leaks**) can be mitigated with regular servicing. Many examples run well into **100,000 miles** with proper care.

---

#### **Cons**

1. **Heavy Weight** At around **500 550 lbs** (depending on modifications), it s one of the heavier bikes in its class. This makes it less nimble in tight corners and requires more effort to maneuver at low speeds.

2. **Poor Handling Compared to Sportbikes** The straight frame and heavy weight give it a **plow-like** feel in turns, especially at high speeds. It lacks the agility of a **sport-touring bike** or **naked bike**, making it less fun for spirited cornering.

3. **Stock Suspension is Basic** The **WP X39 forks** and **rear shock** are adequate but not premium. Many owners upgrade to **Showa or hlins** for better damping and comfort, which can be expensive.

4. **Fuel Injection Reliability Issues** Early models (especially **2008 2010**) had **throttle body and fuel pump issues**, leading to stalling or rough idling. Later models improved, but some still experience **ECU or sensor failures** over time.

5. **Expensive Modifications** While the bike is upgradeable, some modifications (e.g., **full exhaust, suspension, or engine tuning**) can add up quickly. A **full custom build** can easily exceed **$10,000 **.

6. **Maintenance Costs** Like many Triumphs, it requires **regular servicing** (valve adjustments, oil changes, chain maintenance). Ignoring maintenance can lead to **expensive repairs** (e.g., **camshaft wear, oil leaks**).

7. **Wind Noise at High Speeds** The stock windscreen is effective but not as advanced as modern **touring bike screens**. At **70 mph**, wind noise can become intrusive, especially for taller riders.

8. **Limited Stock Comfort for Tall Riders** The **seat height ( 27.5 inches)** and ergonomics may feel cramped for riders over **6 2 **. Some aftermarket seats (e.g., **Ergon or Saddlemen**) help but add cost.

9. **Resale Depreciation** While it holds value better than some bikes, it still depreciates over time. A **high-mileage example** (e.g., **20,000 miles**) will be cheaper than a **low-mileage one**, but both may not fetch a premium.

10. **Not Ideal for Track Use** The **straight frame and heavy weight** make it unsuitable for **track days** or aggressive riding. It s best suited for **highway cruising and relaxed riding**.

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### **Conclusion & Recommendation**

The **Triumph Bonneville (SMT900K1XDT, 2008 2016, straight frame, CLN)** is a **fantastic choice** for riders who prioritize **style, comfort, and a balance of power and reliability** but only if their riding style and expectations align with its strengths and weaknesses.

#### **Best For:**

**Cruising enthusiasts** who love the **classic American look** and **smooth power delivery**.

**Riders who value comfort** on long trips and don t mind a **upright, relaxed position**.

**Those who enjoy customization** and want a **modular platform** for upgrades.

**Budget-conscious buyers** who can find a **well-maintained example** without excessive modifications.

#### **Not Ideal For:**

**Aggressive riders** who want **sharp handling** or **track performance**.

**Those who dislike heavy bikes** and prefer **lighter, more maneuverable machines**.

**Riders who neglect maintenance** this bike **requires regular upkeep** to avoid costly repairs.

**People who prioritize wind protection** over aesthetics (stock windscreen is basic).

#### **Final Recommendation:**

- **Buy if:** You find a **clean, low-mileage example (under 10,000 miles)** with a **full service history**, are willing to **budget for upgrades**, and enjoy **cruising over sporty riding**.

- **Avoid if:** You want a **lightweight, agile bike**, plan to ride **aggressively**, or cannot afford **regular maintenance and potential upgrades**.

- **Consider alternatives:**

- **For cruising:** **Harley-Davidson Sportster (883/1200)** or **Indian Scout** (if you prefer a more upright, modern cruiser).

- **For comfort handling:** **Triumph Trident (if you want more power)** or **Yamaha Tracer 9 GT** (if you want a sportier feel).

- **For track/cornering:** **Triumph Speed Triple** or **BMW R 1250 GS**.

**Best Value Pick:** A **2012 2014 model** (mid-range years with fewer early issues) in **CLN condition**, priced around **$8,000 $12,000**, with a **full service log**. If you plan to modify it, budget an additional **$3,000 $6,000** for upgrades.

Would you like guidance on **what to check during inspection** or **recommended first upgrades**?

Details:

Every part is one-of-a-kind. One-Of-A-Kind When Its Gone, Gone 08-16 Triumph Bonneville Main Frame Chassis STRAIGHT CLN:: - Black painted steel chassis with integrated rear sub frame, tail light, and turn signals. Fits 2009 2015 Triumph Bonneville T1 SE. Item must be in original, uninstalled condition with no modifications.

Look for the Make Offer button on listing page. Part is off a 2013 Triumph Bonneville, with 12552 Miles, Watch A Video From Sun Coast Cycle Sports. We started with a single motorcycle dismantled in home garage.

Please verify the part number and compatible model's before purchasing. Do you accept offers?, Some listings offers. Do you combine shipping?, Yes. We review all reasonable offers promptly.

Structurally sound, no bends or cracks.: Are these genuine OEM parts?, Yes. 4.8 out of 5 stars across 322 reviews.

part #: smt900k1xdt577900 price

  • $1365.44

specifications mocycfra:

  • for models: Bonneville
  • for makes: Triumph
  • for years: 2008-2016
  • mpn: Smt900k1xdt577900
  • type: Frame Main Frame
  • country of origin: England
  • color: Black
  • manufacturer warranty: Unspecified Length
  • placement on vehicle: Center
  • storage location: Z.4.b.1 T577900-o
  • custom1: 233436
  • finish: Painted
  • material: Metal
  • machine type: Street Motorcycle
  • vintage part: No
  • oe/oem part number: T2075298
  • ipn: Smt900k1xdt577900x

returns mocycfra:

  • time: 30 Days
  • policy: Returns Accepted
  • paid by: Buyer

seller mocycfra:

  • # reviews: 230891
  • city: Odessa, Florida
  • rating: 99.5%

shipping mocycfra:

  • class: Freight
  • cost: $0.00
  • service: Flat Rate Freight
  • type: Fixed

payments mocycfra:

  • other
  • wallet: Paypal
  • credit card: Discover

offer mocycfra:

  • options: Ship-to-home
  • sold: 0
  • quantity: 1
  • started: May 19, 2026
  • availability: In Stock

general mocycfra:

  • condition: Used
  • Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts
for models: bonneville, for makes: triumph, for years: 2008-2016, type: frame main frame, country of origin: england, manufacturer warranty: unspecified length, placement on vehicle: center, storage location: z.4.b.1 t577900-o, custom1: 233436, finish: painted, machine type: street motorcycle, vintage part: no, oe/oem part number: t2075298,
category: motorcycle parts > motorcycle scooter parts accessories > body frame > frames parts, color: black, material: metal, sku: 18156869067914663,
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1 offer $1365.44 USD
  • Used. Offer #1 priced at $1365.44 + $0.00 shipping estimate = $1365.44* total. Structurally sound, no bends or cracks Fits 2009-2015 Triumph Bonneville T100, SE.FREE SHIPPING

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