Harddrive Transmission Sprocket - 21t XL 91-UP — Harley-Davidson Sportster 1200 Custom, Sportster 883, Super Low (1991-2019)

Harddrive 21-tooth transmission sprocket for Harley-Davidson XL Sportster 1991 and newer. Precision-machined with hardened teeth for durability, available in an offset configuration to accommodate wider tire fitment without primary or transmission modifications.

Features

• Precision-machined hardened teeth
• OE replacement specification
• Offset design for wider tire clearance
• 1/2" offset available

Specifications

• Brand: Harddrive
• Manufacturer Part #: 191365
• UPC: 191361169359
• Tooth Count: 21
• Dimensions: 5 in L x 4 in W x 1 in H
• Weight: 1.21 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits Harley-Davidson XL Sportster models 1991 and newer.

Frequently Asked Questions

What tooth count should I choose for my Sportster?

21-tooth is the standard replacement. Smaller counts (19-20t) raise top-end speed; larger (22-23t) improve low-end torque. Choose based on your riding style.

Does this sprocket come offset?

This is an offset sprocket with 1/2" offset built in, allowing clearance for slightly wider tires without modifying primary or transmission.

Will this fit my 1989 or earlier Sportster?

No — this part is for XL Sportster models 1991 and newer. Pre-1991 bikes use a different sprocket.

How long do these sprockets last?

Hardened-tooth construction extends mileage compared to standard sprockets. Lifespan depends on riding conditions and chain maintenance — inspect at each chain cleaning.

Do I need to replace the chain when installing a new sprocket?

If your chain is worn, replace it with the sprocket. A new chain on a worn sprocket (or vice versa) causes accelerated wear to whichever part is new.