XL Performance Rear Sponsons

XL Performance Rear Sponsons


  • Description
  • Additional information
  • Reviews (1)


Our “Performance XL Rear Sponson” kit is designed to improve the riders confidence when riding their Stand up watercraft. The design was created by Chris Hagest. He says: These Performance XL Rear Sponsons offer improved turning grip, better stability in a straight line and when leaning over in a turn. The difference between us and the other options on the market is grip and high speed turning the ski is easier to lean which makes the ride smoother through the complete turn. The HFC sponson bolts to the top of the bond flange and it comes with a hardware kit.

What You Need to Know:

  • For the lifetime warranty, you need to install this product with our approved silicone. Apply silicone to all the edges and wipe off any excess from the surface of the product after installation. Smooth out any excess silicone along the edges as well. Allow the silicone 24 hours to cure.
  • This product does not include a cutout for the 550 H.I.N. tags. You can modify the parts easily but this will void the warranty. Otherwise, you can mount them in front of the tags with no performance loss.

  • This product fits: Kawasaki 440 / 550 (all years) (other models not confirmed)
  • Installation time: 30 – 45 minutes

  • What is the difference between this product and the OBF (Over the Bond Flange) sponsons?
    These XL Performance Rear Sponsons are designed for general riding up through racing with a more flat turning angle and better stability. The OBF sponsons provide similar rear grip in the turns but allow for full lean in the turns and corners.

Additional information

Weight 7 lbs
Dimensions 24 × 5 × 3 in


1 review for XL Performance Rear Sponsons

  1. 5 out of 5

    Must have if you’re a vintage racer. These will completely lock the rear end of the Skis down in the turns if you lay the ski over causing you to hook up instead of slide out. Also in rough water they made the ski stand very up right and not wanting to roll like the 550s do at high speeds. Definitely recommend these to any 550 rider/racer

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