From Pathfinder #155: Lord of the Black Sands, which isn't enabled.

Heedless Spurs

ITEM 15

Price 5200 gp

Usage worn anklets

Bulk L

These wicked-looking spiked metal wheels fit around the ankles and jingle when the wearer walks, imposing a -1 item penalty on Stealth checks. If used as a weapon, they are treated as a Spiked Gauntlet.

Activate Interact

Frequency once per 10 minutes

Requirements You are riding a mount

Effect You kick both spurs into your mount's flank. Your mount takes 2d6 bleed and gains the quickened condition for 1 minute or until the persistent bleed damage ends, whichever comes first. It can use the extra action only to Stride.

Pathfinder #155: Lord of the Black SandsOGL