My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Vortex 491AZK-39 CAT5 Aluminum Rear Sprocket 520 Pitch 39-Tooth Black

Manufacturer

Picture for manufacturer Vortex

Part Number

491AZK-39
9 reviews
Sale Price

$65.41

Estimated ship date Saturday, November 28

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Vortex 491AZK-39 is a CAT5 series aluminum rear sprocket featuring a 520 chain pitch and 39-tooth count, finished in a black anodized coating. Designed as a direct performance upgrade over stock steel sprockets, this sprocket reduces rotating mass for improved throttle response and drivetrain efficiency.

Key Features:

  • Material: Lightweight CAT5 aluminum — specially formulated alloy per Vortex specifications
  • Chain Pitch: 520
  • Tooth Count: 39 teeth
  • Color/Finish: Black anodized
  • Construction: 100% CNC machined in the USA for precise concentricity and consistent fitment
  • Tooth Design: Vortex patented saber tooth groove design increases sprocket longevity and reduces chain wear
  • Performance: Reduced rotating mass delivers quicker throttle response and enhanced acceleration

The 491AZK-39 is part of Vortex's trusted CAT5 lineup — a popular choice among street and track riders seeking a lightweight, durable alternative to OEM rear sprockets. The black anodized finish provides corrosion resistance and a clean, aggressive appearance.

Very good

I received the bar and it looks to be very high-quality. However, this bar says it fits a 2003 through 2013 dodge ram 25 and 3500 series trucks. However, from 2003 to 2007-1/2. This truck comes with 1/2' (14mm) bolts. This bar only comes with the 14 mm and the upgraded 5/8' Hardware for the top joint. The lower joint connecting to the Axle only has the 5/8 hole and does not come with a reducing kit nor does it come with an upgraded 5/8' bolt, which would at least allow you to drill out the lower Mounting holes to mount this bar. As a result, you cannot use the original bolt and you have to go to Supply store to find the correct size bolt to allow you to mount this track bar. Highly inconvenient for the customer, especially when there is no mention of this in the description for the part. At the bare minimum, this track bar should've came with the second 5/8' bolt With the kit.

Great prices and fast delivery!

Quick and as promised. Exactly what I ordered.

Y'all the only ones to have what I needed. Thus far

A

your system is not clear and haard to navigate

New testing the company

shipping was quite expensive

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy