Tamer rear holeshot device. Fits 07-22 YZ250F and YZ450F. USED WITH STOCK SHOCK. Retail is 179.98. PB1449 Description from Tamer: How It Works: The Tamer Rear Holeshot Hookup works in 2 stages. STAGE 1 - When you are ready to start, hold the front brake, apply the throttle and let out the clutch until it begins to engage or “chatter”. Without a rear device, the rear of the bike raises up during this time, and when you leave the gate, the rear has to settle back down, and this absorbs energy from the motor that could be going toward forward motion. With the Tamer rear Holeshot Hookup, the rear of the bike is not allowed to raise up during take-off, ensuring that all energy produced by the engine is transferred to a forward motion. This equals 3 to 4 tenths of a second. STAGE 2 - Without the device, the rear of the bike has raised up, you dump the clutch to take off and the rear shock settles down. By doing this, you preload the rear shock, and when the rear tire makes contact with the gate, the shock rebounds, and the rear tire loses traction with the ground. With the Tamer Holeshot Hookup installed, the bike is already settled down, and when the rear tire makes contact with the start gate, it releases the latching system and drives the rear tire into the ground without losing any traction. This can equal 4 to 5 tenths of a second. ALL orders include a FREE $20 Motosport gift card! No strings attached just place that order! Please confirm fitment before ordering. Let me know if you have any questions! Thanks for shopping! *International Buyers are responsible for Import Fees / Duty Fees / Taxes* *Buyer is responsible for verifying condition BEFORE purchase! (more photos can be provided upon request) ALL SALES ARE FINAL*