Product Description
- Winner of the 2024 Cycle Source Magazine Awards Performance Product of the Year
- Handcrafted 6061-T6 aluminum extended swingarm
- 100% bolt-on design can be used with OEM rear wheel, caliper, spacers and associated components (see 'fitment' tab for model listing)
- Offset pivot mount increases oil pan clearance
- Offset mounting allows use of longer shocks
- Proprietary custom extrusion made exclusively for Brock's Performance
- Adjustable wheelbase, from stock location up to 3 inches over
- Designed for use in high-power, high-torque applications
- Includes centerless ground hollow 4130 chromoly axle
- Reversible billet aluminum axle adjusters for easy wheel adjustments
- Includes newly-revised caliper bracket for use with OEM and most aftermarket brake caliper setups*
- PTFE® lined spherical bearings from Worldwide Bearings preinstalled
- Includes spacers to use the OEM 3/4” pivot shaft
- Interior swingarm width measures 10 7/8” at the axle
(accepts 200 series rear tire on 6.75” wide rim with chain conversion) - 42% weight savings vs OEM swingarm (see the 'technical' tab for details)
- Designed, machined, and assembled in the USA
- Black powder coated finish
- Click here to view installation information
- Click here to view pivot bolt stack-up engineered drawing
- Note: For West Coast Bagger Swingarm owners looking to extend their wheelbase, a modification is required (click here for more information)
- Overall hub width is critical for proper operation/handling, see 'Technical' tab for important information regarding installation
Shock/Rear Brake Information:
- OEM rear brake caliper and hanger are only compatible when the rear axle is located in or near the stock wheelbase location to prevent caliper mounting bolt interference with the inner side of the right shock mount. For extended wheelbase applications, see these compatible brake hangers.
- 3-position shock mounts allow flexibility in ride height (+2”, +1”, stock)
- Compatible with shock lengths from 13” to 15”
- H-D Premium Ride Touring Shocks will only work in the +2” shock position
- Brock’s Performance recommends adjustable Bitubo shocks for best performance and adjustability
*Attention* If using an aftermarket brake hanger, care must be taken to ensure it does not bottom out on the supplied caliper mounting bracket. Failure to do so can lead to swingarm failure, loss of control, injury, and even death. For swingarms purchased before 02/01/2026, an upgraded Brake Mounting Kit is available here to accommodate most aftermarket brake setups.
Exhaust Clearance Note: Due to the increased ride height, the swingarm sits at a greater downward angle (axle is lower than pivot shaft). Depending on the exhaust system used, additional clearance around the muffler may be required to clear the axle.
What do you get when you combine 25 years of sportbike drag racing and innovation with a V-Twin industry cry for a swingarm that can handle the ever-increasing demands of ultra-powerful baggers? Introducing the West Coast Bagger Swingarm™, by Brock’s Performance. Leaning heavily on technology proven in the ‘stupid fast’ turbocharged sportbike area, our tubing, bracing, billet aluminum ends and 28mm Chromoly axle configuration routinely control 750 hp/350 ft-lb no wheelie bar missiles in 6 second/220MPH action.
Adapting this winning combination for smooth operation and long street life for your FL, we installed replaceable PTFE® lined spherical bearings from Worldwide Bearings at the pivot loops. Adding a bit of flexibility to the stance and chassis tunability in the rear, billet 3-position shock mounts (1/2-13 thread) are standard allowing for +2”, +1”, and stock height mounting positions. Speaking of flexibility, check out the billet bolt-on brake stay designed to function with the OEM brake hanger. In fact, Brock’s Performance Bagger swingarm is 100% bolt-on using your OEM rear wheel, spacers, and pulley or your favorite aftermarket replacement rear wheel.
Don’t forget the extra 3” length can be worth as much as 3 tenths improvement in the 1/4 mile. The bottom line, weighing in at a little over 1/2 the weight of the OEM swingarm and built to handle as much power as you can throw at it, moving/bent axles can now be a thing of the past, and you can look great and go faster too.
Note: West Coast Bagger Swingarms are not designed for off-road use.
American V-Twin Fitment Statement:
Although all attempts have been made to handcraft a product which will fit a wide variety of machines for a particular make/model/year, due to idiosyncrasies between particular years, available options, accessories, etc…, fitment cannot be 100% guaranteed. If upon assembly, fitment issues are discovered which are beyond the installer's ability or willingness to correct, then please feel free to contact our customer service department, alert Brock’s Performance of the fitment issue for your particular make/model, and obtain an RMA (Return Material Authorization). Brock’s Performance will accept unmodified swingarms, in 100% resalable condition for a full refund.
Please note, refunds are issued after product inspection at Brock’s Performance, and the customer is responsible for any/all shipping charges.
Attention: When spacing Bagger rear wheel, the overall width including spacers, brake hanger, etc. Must be: 10.875 in +.020in/-.000in / (276.22mm +.50mm/-.00mm)
Overall hub width is critical for proper operation/handling, product longevity, and rider safety. Brock’s Performance will not warranty any damaged swingarm found not to be in compliance with these spacing guidelines.
West Coast Bagger Swingarm Weight:
- Swingarm w/Bearings: 11.10 lb. (5.04 kg)
- Axle w/Nuts:
- 25mm - 2.48 lb. (1.12 kg)
- 28mm - 2.77 lb. (1.26 kg)
- Axle Blocks:
- 25mm - 0.76 lb. (0.35 kg)
- 28mm - 0.74 lb. (0.34 kg)
- Pivot Bushings: 0.43 lb. (0.20 kg)
- Brake Mount w/Screws: 0.55 lb. (0.25 kg)
25mm Total = 15.32 lb. (6.95 kg)
28mm Total = 15.59 lb. (7.07 kg)
OEM Harley-Davidson® Swingarm Weight: 22.78 lb. (10.33 kg)
OEM Harley-Davidson® Axle Weight: 3.55 lb. (1.61 kg)
Total = 26.33 lb. (11.94 kg)
Total Weight Savings = 11.01 lb. (4.99 kg) or 42% of OEM weight
