BEL-RAY SKU: 840-1478

Bel-Ray Sport Transmission Fluid - 1 Liter Harley-Davidson Sportster

$15.99
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About Bel-Ray

Bel-Ray has manufactured motorcycle lubricants since 1948, with V-twin specific engine, primary and transmission oils formulated for air-cooled operating temperatures.

Protect your Harley-Davidson Sportster's transmission and primary drive with Bel-Ray Sport Transmission Fluid. This genuine formulation is specifically engineered for V-twin motorcycle transmissions, providing critical wear protection and preventing clutch slipping. The distinctive red color also aids in quickly spotting any leaks during routine maintenance.

Why riders pick this

  • Optimized for Sportster transmissions and primary drives
  • Extends transmission component life with wear protection
  • Prevents clutch slipping and chatter
  • Red color for quick leak identification

Bel-Ray Sport Transmission Fluid is purpose-built for the demands of Sportster transmissions and primary drives. Unlike generic fluids, this formulation is optimized to extend the life of your gears and clutch components. Riders often overlook the importance of specialized transmission fluid, but using the correct product can dramatically improve shifting feel and clutch engagement, reducing the likelihood of costly repairs down the road.

Engineered for Sportster Drivelines

  • Formulated specifically for Sportster transmissions and primary drives
  • Provides superior wear protection to extend component life
  • Helps prevent clutch slipping and chatter for smooth engagement
  • Distinctive red color for easy leak detection and maintenance

Maintain Your Sportster's Edge

Ensuring your Sportster's transmission and primary are properly lubricated is key to its performance and longevity. Bel-Ray Sport Transmission Fluid not only protects against wear but also contributes to a more responsive and reliable ride. For optimal results, ensure your fluid levels are correct and consider pairing this with a high-quality primary cover gasket during your maintenance routine.

Specifications

  • Brand: Bel-Ray
  • Manufacturer Part #: 96925-BT1
  • UPC: 690509401394
  • Volume: 1 liter
  • Weight: 2.15 lbs
  • Package Dimensions: 8 in L × 4 in W × 2 in H

Common questions

What makes Bel-Ray Sport Transmission Fluid different from other fluids?

Bel-Ray Sport Transmission Fluid is specifically formulated for V-twin transmissions and primary drives, with a focus on preventing wear and clutch slipping, especially in Harley-Davidson Sportster models.

Can I use this in my Harley Touring or Milwaukee-Eight?

This product is primarily formulated for Sportster transmissions. For Harley Touring or Milwaukee-Eight models, you should consult your owner's manual or use a fluid specifically designed for those platforms to ensure proper lubrication and protection.

Does this fluid come in different viscosities?

Bel-Ray Sport Transmission Fluid is a specific formulation designed for its intended application. For details on viscosity, please refer to the product specifications or your motorcycle's service manual.

Ordering from Vtwinbikers

  • Brand new, sourced through authorized US distribution — never used, never grey-market.
  • Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
  • Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
BRANDBel-Ray
TYPEChemicals
SKU840-1478
WEIGHT2.15 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.79
24 RATINGS
5★ 21
4★ 2
3★ 0
2★ 1
1★ 0
✓ VERIFIED
Dec 2, 2021

My “Indy” recommended this product to me over twenty years ago. Have been using it in my three Sportsters to the tune of 344,000+ miles. This last service was on my 2004 with 115,000 miles and being the original primary chain I chose to replace the chain and tensioner assembly. To make a point the new chain and the original when laid side by side were effectively the exact same length. The plastic tensioner shoe was deeply scored and worn down nearly to the metal backer. I’m very satisfied and will continue my use of BelRay!

— Anonymous
✓ VERIFIED
Oct 5, 2023

Sportster Primary and Tranmission

What I run in my Sportster Primary / transmission.

— JEFFERY R
✓ VERIFIED
Sep 10, 2021

This primary case oil is exactly what I needed to quieten down my transmission noises. While improving my shifting and o overall performance.

— Anonymous
✓ VERIFIED
Aug 23, 2025

Bel-ray sport

Great product I really like bel-ray fluids

— Craig P
✓ VERIFIED
Mar 6, 2025

Transmission shifts very smoothly with belray

Works great don’t use anything else

— Scott S
✓ VERIFIED
Sep 12, 2024

BelRay

Works well , as do all the beltway products. Been using this for 7 years.<br />Been using BelRay products when racing Moto Cross

— GREGORY G