1. Motorcycle Frames Offers
  2. sku: 17544116682152782
  3. BMW WB10558A73ZK00012

BMW WB10558A73ZK00012 Frame Chassis Wa Bos

fits model: K1200gt, K1200, Gt. make: Bmw. year: 1999–2004.

Wb10558a73zk00012 Bmw 1999-2004 K1200gt K1200 Gt Main Frame Chassis Wa Bos

( Manufacturer Part Number: WB10558A73ZK00012 ), ( Part Type: Frame )

Review BMW Main Frame Chassis Wa Bos fits K1200GT K1200 GT 1999–2004

The **BMW K1200GT (WB10558A73ZK00012, 1999 2004)** represents the pinnacle of BMW s legendary motorcycle engineering, blending raw power, timeless design, and uncompromising craftsmanship into a machine that transcends mere transportation. Built upon the robust **WB10558 chassis**, this iconic naked bike is the spiritual successor to the legendary K100RS and K100RT, yet it redefines the genre with a 1,200cc air-cooled, liquid-chilled, four-cylinder engine that delivers a symphony of power and refinement. The **K1200GT s frame**, a masterpiece of tubular steel construction, is both rigid and supple, engineered to absorb road imperfections while maintaining razor-sharp handling. The **WA (Werkstoffauswahl) chassis variant**, specifically the **Bos (Basis) model**, denotes a foundational build designed for enthusiasts who appreciate the raw potential of the K1200GT without the added weight or complexity of optional extras. This chassis is the backbone of the bike, featuring a **double-cradle design** with a central swingarm pivot and a rear subframe that ensures stability and precision, even at high speeds.

Under the sleek, aerodynamic bodywork, the **1,198cc air-cooled inline-four engine** (with a bore and stroke of 79mm x 60.1mm) roars to life, producing a smooth yet exhilarating **125 hp at 8,500 RPM** and **108 lb-ft of torque at 6,500 RPM** enough to propel the K1200GT from 0-60 mph in just **3.3 seconds** and reach a top speed in excess of **155 mph**. The engine s **desmodromic valve actuation** (a BMW hallmark since the 1980s) ensures precise valve control, eliminating valve float and maximizing efficiency, while the **wet sump lubrication system** and **multi-disc wet clutch** provide seamless power delivery. The **six-speed transmission**, paired with a **final drive ratio of 2.777:1**, offers a perfect balance of low-end torque and high-speed stability, making the K1200GT equally at home on winding roads or open highways.

The **Bos chassis variant** is stripped down to its essentials, emphasizing weight savings and mechanical purity. The **aluminum swingarm** and **cast aluminum wheels** (with 320mm front and 320mm rear brakes) contribute to a **dry weight of around 490 lbs**, a figure that remains impressively light for a bike of this caliber. The **front suspension** features **43mm inverted Showa forks** with adjustable preload, compression, and rebound damping, while the **rear suspension** is handled by a **pro-link monoshock with adjustable preload and rebound damping**, ensuring both comfort and control. The **steering head angle of 63.5 degrees** and **wheelbase of 61.0 inches** create a nimble, responsive ride that rewards the rider with effortless cornering and a neutral, balanced feel. The **telescopic front brake system** with **dual 320mm discs and four-piston calipers** provides exceptional stopping power, while the **rear single disc with a two-piston caliper** complements it with progressive modulation.

The **K1200GT s design** is a study in minimalist elegance, with its **aerodynamic fairings, aggressive LED headlight, and sleek windscreen** reducing drag while maintaining a sporty aesthetic. The **blacked-out engine covers, polished aluminum accents, and matte-finished components** give it a distinctive, understated sophistication that sets it apart from its contemporaries. The **ergonomics** are tailored for both comfort and performance, with an **upright riding position** that allows for long-distance endurance without sacrificing agility. The **BMW s signature "Naked" styling** exposed engine, minimalist bodywork, and a focus on function over form makes the K1200GT a head-turner on any road, while its **adjustable windscreen** and **comfortable seat** ensure that riders can enjoy both sporty outings and relaxed cruising.

For the discerning rider, the **WB10558A73ZK00012 K1200GT (Bos chassis)** is more than just a motorcycle; it s a **legacy machine** that embodies BMW s commitment to innovation, durability, and driving pleasure. Whether cruising along coastal highways, navigating twisty mountain roads, or simply enjoying the open road, this bike delivers a **perfect harmony of power, precision, and passion**. Its **timeless design, proven reliability, and exhilarating performance** ensure that it remains a sought-after classic, cherished by enthusiasts for generations to come. With its **air-cooled engine, robust chassis, and unmatched handling**, the K1200GT stands as a testament to BMW s engineering brilliance a bike that doesn t just go fast, but **goes with purpose**.

### **Pros and Cons of Buying a BMW K1200GT (WB10558A73ZK00012, 1999 2004, Frame Chassis WA/BOS)**

#### **Pros**

1. **Superior Performance and Handling**

The K1200GT is one of the most capable naked motorcycles of its era, offering a 1,200cc parallel-twin engine that produces around **115 120 hp** and **100 110 lb-ft of torque**. Its **balanced power delivery**, smooth revving nature, and **excellent throttle response** make it a joy to ride, whether on twisty roads or straightaways. The **lightweight chassis** (around **210 220 kg / 460 485 lbs**) enhances agility, and the **fully adjustable hlins suspension** allows for precise tuning.

2. **Reliability and Durability**

BMW s **parallel-twin engine** is known for longevity when maintained properly. With **oil changes every 6,000 8,000 miles** and regular service, many K1200GTs exceed **100,000 150,000 miles**. The **aluminum frame** is robust, and the **hydraulic disc brakes** (Brembo in later models) are reliable if serviced. Unlike some Japanese bikes, BMW s components are **built to last** with proper care.

3. **Comfort and Ergonomics**

The K1200GT features a **upright riding position**, making it **more comfortable for long rides** compared to sportbikes. The **wide, well-padded seat** and **adjustable windscreen** reduce fatigue on extended tours. The **ergonomics** are well-balanced, offering a mix of sportiness and comfort.

4. **High-Quality Build and Finishing**

BMW s **German engineering** is evident in the **precision assembly, smooth transmission, and refined interior**. The **digital instrument cluster** (in later models) provides useful data, and the **high-quality materials** (leather seats, metal accents) give it a premium feel.

5. **Strong Aftermarket Support**

The K1200GT has a **dedicated fanbase**, leading to a **thriving aftermarket** for parts, upgrades, and modifications. Common upgrades include **exhaust systems, ECU tuning, suspension adjustments, and aesthetic mods**, keeping the bike relevant even decades later.

6. **Resale Value and Collectibility**

While not as sought-after as some vintage BMWs (e.g., R1100GS), the K1200GT retains **better value than many contemporaries** (e.g., Honda CBR900RR, Suzuki GSX-R1100). As a **mid-range classic**, it s a **smart investment** for enthusiasts who appreciate BMW s legacy.

7. **Touring Capability (Compared to Sportbikes)**

Unlike pure sportbikes, the K1200GT is **capable of long-distance riding** without feeling overly fatiguing. Its **stable chassis, comfortable seating, and decent wind protection** make it a **versatile bike** for both track days and weekend cruises.

---

#### **Cons**

1. **High Maintenance Costs**

BMW motorcycles are **not cheap to maintain**. **Oil changes, valve adjustments, and suspension servicing** cost significantly more than on Japanese bikes. **Brake pads, rotors, and tires** are also premium-priced. **Long-term ownership requires a budget** for upkeep.

2. **Complexity and Mechanical Knowledge Required**

The K1200GT s **parallel-twin engine** is **more complex than a single-cylinder or inline-four**, requiring **regular maintenance** (e.g., **valve lash adjustments every 10,000 15,000 miles**). If the owner lacks mechanical experience, **professional servicing becomes essential**, adding to costs.

3. **Weight and Power Delivery**

While **light for a BMW**, the K1200GT is **heavier than some sportbikes** (e.g., Honda CBR900RR). The **parallel-twin s torque curve** is **smooth but not as linear as a V-twin or inline-four**, which some riders find less engaging at low RPM. The **heavy clutch** can also be a drawback for quick gear changes.

4. **Braking Limitations (Early Models)**

The **original Brembo brakes (1999 2001 models)** are **adequate but not exceptional** compared to later models (2002 with **larger rotors and improved calipers**). **Wear and tear on brake components** can be an issue if not maintained properly.

5. **Fuel Economy**

The K1200GT **averages around 40 50 mpg (6.5 7.5 L/100km)**, which is **worse than many modern bikes** but **better than some Japanese sportbikes of the era**. For long-distance riders, **fuel costs add up**, especially on highway cruising.

6. **Vibration and NVH (Noise, Vibration, Harshness)**

The **parallel-twin s mid-range hum** can be noticeable, especially at **cruising speeds (70 90 mph / 110 145 km/h)**. While not as bad as some older BMWs, it s **more pronounced than a smooth V-twin or inline-four**. **Suspension tuning** can help mitigate some of this.

7. **Parts Availability and Lead Times**

While **not as rare as some BMW classics**, the K1200GT is **not as widely supported as newer models**. **OEM parts can have long lead times**, and **aftermarket options may be limited** compared to more popular bikes (e.g., GS bikes, R1200GS).

8. **Riding Position and Wind Resistance**

While more upright than a sportbike, the K1200GT s **position is still aggressive** for casual riders. At **high speeds (above 80 mph / 130 km/h)**, **wind noise and buffeting** become noticeable, requiring a **windscreen or fairing** for comfort.

9. **Potential for Hidden Issues**

**Buying used**, the K1200GT may have **hidden problems** such as:

- **Worn suspension components** (shocks, forks, bushings)

- **Leaking seals** (oil, coolant, brake fluid)

- **Electrical gremlins** (ECU, sensors, wiring)

- **Frame cracks** (rare but possible in high-mileage examples)

A **pre-purchase inspection (PPI) by a BMW specialist** is **highly recommended**.

10. **Depreciation Over Time**

While it holds value better than many contemporaries, the K1200GT **does not appreciate like a rare classic**. If sold later, the **return on investment may not be as high as expected**, especially if the bike is heavily modified.

---

### **Conclusion**

The **BMW K1200GT (1999 2004)** is a **fantastic motorcycle** for riders who appreciate **German engineering, balanced performance, and a mix of sport and touring capability**. It is **reliable if maintained properly**, offers **excellent handling**, and remains a **fun, engaging bike** for both track days and road trips.

However, **ownership comes with trade-offs**:

- **Higher maintenance costs** than Japanese bikes.

- **Complexity requiring regular servicing**.

- **Weight and vibration** compared to lighter alternatives.

- **Potential for hidden issues** in used examples.

**If you:**

**Have a budget for maintenance**

**Enjoy BMW s build quality and performance**

**Ride mostly on twisty roads or mix of highway and track**

**Appreciate a bike that s both sporty and comfortable**

then the **K1200GT is an excellent choice**.

**If you:**

**Want lower running costs**

**Prefer a lighter, more agile bike**

**Ride mostly on highways or in urban areas**

**Don t want to deal with complex maintenance**

then consider alternatives like a **Honda CBR900RR, Suzuki GSX-R1100, or a modern BMW (e.g., R 1250 GS)**.

---

### **Final Recommendation**

**Buy the K1200GT if:**

- You **find a well-maintained example** (under **50,000 miles** if possible, or **properly serviced high-mileage bikes**).

- You **budget for regular maintenance** (oil changes, valve adjustments, suspension service).

- You **appreciate BMW s parallel-twin power and handling**.

- You **plan to ride it regularly** (not just for weekends).

**Avoid if:**

- You **can t afford the long-term costs** of BMW ownership.

- You **don t have access to a BMW mechanic** for servicing.

- You **prefer a simpler, more fuel-efficient bike**.

**Best

Details:

Buyer pays return shipping. 1999 2004 BMW K1200GT K1200 Main Frame Chassis WA BOS: Donor Bike: 2003. All part are used and should be inspected before install.

part #: wb10558a73zk00012 price

  • $344.59

specifications mocycfra:

  • for models: K1200gt, K1200, Gt
  • for makes: Bmw
  • for years: 1999-2004
  • mpn: Wb10558a73zk00012
  • part type: Frame

payments mocycfra:

  • credit card: Discover
  • other
  • wallet: Google-pay

seller mocycfra:

  • # reviews: 4909
  • city: Camas, Washington
  • rating: 99.6%

general mocycfra:

  • condition: Used
  • Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts

returns mocycfra:

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

offer mocycfra:

  • started: April 3, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • quantity: 1
  • best offers: True

shipping mocycfra:

  • service: UPS Ground
  • transit: 4-7 Days
  • class: Standard
  • carrier: UPS
  • type: Fixed
  • cost: $0.00
for models: k1200gt, k1200, gt, for makes: bmw, for years: 1999-2004, part type: frame,
category: motorcycle parts > motorcycle scooter parts accessories > body frame > frames parts, sku: 17544116682152782,
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1 offer $344.59 USD
  • Used. Offer #1 priced at $344.59 + $0.00 shipping estimate = $344.59* total. All part are used and should be inspected before install. Donor Bike: 2003 BMW K1200GT.FREE SHIPPING

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