1. Vintage Bicycle Parts For Sale
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  3. YAMAHA 20T-18T-16T

YAMAHA 20T-18T-16T Bike Rear Wheel Sprocket Moto

20t-18t-16t Yamaha Lot 3 Moto Bike Rear Wheel Sprocket 1974-1976 New Old Stock

( Brand: Yamaha ), ( Manufacturer Part Number: 20T-18T-16T ), ( Model: YAMAHA MOTO 20T-18T-16T ), ( Part Type: Bike Wheel Sprocket ), ( For Bike Type: Bmx Bike Old School ), ( Vintage: Yes )

Review YAMAHA Lot Bike Rear Wheel Sprocket New Old Stock

The **Yamaha 20T, 18T, and 16T rear wheel sprocket** for the **1974 1976 models** of the iconic Yamaha TD1, TD2, and TD2E series motorcycles represents a critical yet often overlooked component essential for maintaining optimal performance, reliability, and longevity of these classic bikes. Designed specifically for the **2-stroke, air-cooled, single-cylinder engines** found in these models, these sprockets are forged from high-quality **chrome-molybdenum steel**, ensuring durability under the demanding conditions of high-speed riding, aggressive acceleration, and prolonged use. The **1974 1976 models** feature a distinct sprocket design tailored to the **Yamaha s unique drivetrain configuration**, with precise tooth spacing and a robust mounting system that aligns perfectly with the **chain-driven rear wheel assembly**. Whether you re restoring a vintage TD1 for weekend cruising or preparing a TD2E for track days, these sprockets are engineered to minimize chain wear, reduce backlash, and deliver smooth, consistent power transfer from the engine to the rear wheel critical for preserving the bike s original performance characteristics.

The **20T, 18T, and 16T variations** cater to different riding preferences and tuning needs. The **20-tooth sprocket** offers a balanced power delivery, ideal for stock or lightly modified bikes seeking a smooth, responsive ride without excessive strain on the engine. The **18-tooth sprocket**, slightly more aggressive, provides a quicker gear ratio, enhancing acceleration and top-end speed while maintaining manageable chain tension. Meanwhile, the **16-tooth sprocket** is designed for riders who prioritize raw performance, offering a significant power boost and higher RPM potential though it may require adjustments to the chain tensioner and drivetrain setup to prevent premature wear. Each sprocket is meticulously machined to Yamaha s original specifications, ensuring a **perfect fit** with the **518 or 520 chain** used in these models, while also accommodating aftermarket chains if desired. The **press-fit design** ensures secure mounting on the **rear wheel hub**, reducing the risk of slippage or misalignment, which is particularly important for bikes that see frequent use or are subjected to off-road conditions.

Beyond their functional role, these sprockets play a vital part in the **aesthetic and mechanical integrity** of the Yamaha TD series. The **clean, uncluttered design** of the sprocket hub complements the bike s minimalist yet robust engineering, while the **precise tooth profile** ensures smooth engagement with the chain, reducing noise and vibration a hallmark of Yamaha s attention to detail in its classic motorcycles. For collectors and enthusiasts, sourcing an **authentic OEM or high-quality aftermarket replica** of these sprockets is essential for maintaining the bike s historical accuracy, especially when participating in vintage motorcycle shows or restoration projects. Whether you re replacing a worn-out original or upgrading for performance, these sprockets are a **must-have component** for anyone committed to keeping their Yamaha TD1, TD2, or TD2E running at its best blending reliability, heritage, and performance in a single, compact yet indispensable part.

### **Pros and Cons of Buying a Yamaha 20T-18T-16T Rear Wheel Sprocket for a 1974-1976 Yamaha Motorcycle**

#### **Pros:**

1. **Compatibility** These sprockets are designed specifically for Yamaha bikes from the 1974-1976 model years, ensuring a proper fit without modification.

2. **Performance Adjustment** Changing the sprocket size (20T, 18T, or 16T) allows for fine-tuning of gearing, which can improve acceleration, top speed, or throttle response depending on rider preference and riding conditions.

3. **Durability** Yamaha sprockets are typically made from high-quality steel, offering longevity if properly maintained.

4. **Ease of Installation** These sprockets are straightforward to install, requiring only basic tools and a chain adjustment afterward.

5. **Cost-Effective Upgrade** Compared to full drivetrain replacements, swapping a single sprocket is a relatively inexpensive way to modify bike performance.

6. **Aftermarket Support** Since these are common parts, finding replacements or additional sprockets (e.g., 17T, 19T) is easy if further tuning is desired.

7. **Maintenance Benefits** A properly sized sprocket can reduce excessive chain wear, leading to longer chain and sprocket life if the gearing is optimized for the bike s intended use.

#### **Cons:**

1. **Potential Chain Wear** If the sprocket size is too small (e.g., 16T), it can cause excessive chain stretch or premature wear on both the sprocket and chain, requiring more frequent maintenance.

2. **RPM Increase** Smaller sprockets (e.g., 16T) will increase engine RPM at a given speed, which may lead to higher stress on the engine and transmission if not properly balanced with other modifications.

3. **Top Speed Limitations** A smaller sprocket (e.g., 16T) may reduce top speed if the engine is not tuned to handle the increased load, especially on older bikes with less power.

4. **Chain Adjustment Required** After installation, the chain may need frequent adjustments to maintain proper tension, especially if the sprocket size changes significantly.

5. **Potential Fitment Issues** If the sprocket is not an exact match (e.g., slightly worn or misaligned), it could cause uneven wear or even damage to the chain or rear wheel bearings.

6. **Limited Power Gain** On an older bike with a naturally aspirated engine, sprocket changes alone may not provide significant power gains unless combined with other modifications (e.g., carburetor tuning, exhaust upgrades).

7. **Resale Impact** If you plan to sell the bike later, some buyers may prefer stock or less aggressive gearing, potentially reducing resale value.

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### **Conclusion:**

Swapping a rear wheel sprocket on a 1974-1976 Yamaha is a practical and relatively low-cost way to adjust the bike s gearing for better performance or comfort. The choice between a **20T, 18T, or 16T** depends on your riding style:

- **20T (stock or slightly larger)** Best for cruising, reducing engine strain, and improving low-end torque.

- **18T (moderate reduction)** A balanced choice for daily riding, offering a good mix of acceleration and top speed.

- **16T (aggressive reduction)** Ideal for track use, aggressive riding, or if you prefer higher RPMs but may require more frequent chain maintenance.

If you re unsure, an **18T sprocket** is often a safe middle-ground option that enhances performance without extreme trade-offs.

### **Recommendation:**

- **For street riding:** An **18T sprocket** is a solid choice, offering a noticeable improvement in acceleration without excessive wear.

- **For track or aggressive riding:** A **16T sprocket** can be used, but pair it with a **high-quality chain** and be prepared for more frequent adjustments.

- **For cruising or low-speed use:** A **20T sprocket** (or even slightly larger) may be preferable to reduce engine stress.

- **Always pair the sprocket change with a new chain** to prevent premature wear.

- **Consult a Yamaha specialist or bike mechanic** if you re unsure about the best fit for your specific riding conditions.

Ultimately, the right sprocket depends on your priorities whether you value acceleration, comfort, or longevity. Test ride the bike after installation to ensure it feels right before committing to a permanent change.

Details:

LOT 3 YAMAHA MOTO BIKE REAR WHEEL SPROCKET 20T-18T-16T 1974-1976. 20T model: J60-25420-10-00. 18T model: J60-25418-10-00. 16T model: J60-25416-10-00.

part #: 20t18t16t price

  • $40.00

specifications vintagebikepartiz:

  • brand: Yamaha
  • mpn: 20t-18t-16t
  • model: Yamaha Moto 20t-18t-16t
  • part type: Bike Wheel Sprocket
  • for bike type: Bmx Bike Old School
  • vintage: Yes

returns vintagebikepartiz:

  • policy: No Returns

shipping vintagebikepartiz:

  • transit: 4-10 Days
  • class: Standard
  • cost: $8.00
  • type: Fixed
  • carrier: USPS
  • service: USPS Ground Advantage

offer vintagebikepartiz:

  • started: May 17, 2026
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

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seller vintagebikepartiz:

  • # reviews: 155
  • city: Howell, New Jersey
  • rating: 100.0%

general vintagebikepartiz:

  • Cycling > Vintage Cycling > Vintage Bicycle Parts
part type: bike wheel sprocket, for bike type: bmx bike old school, vintage: yes,
category: sporting goods > cycling > vintage cycling > vintage bicycle parts, sku: 7747704534743722,
Yamaha 20T-18T-16T Is Similar To:
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1 offer $40.00 USD
  • Offer #1 priced at $40.00 + $8.00 shipping estimate = $48.00* total. LOT (3) YAMAHA MOTO BIKE REAR WHEEL SPROCKET 1974-1976 NEW OLD STOCK - NOS 20T MODEL: J60-25420-10-00 18T MODEL: J60-25418-10-00 16T MODEL: J60-25416-10-00.+$8.00 shipping

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