Frames are EXCLUDED from the $99 & up Free Economy Shipping special. FAQ
For 2004-2022 Harley-Davidson Sportsters (Except Revolution Max Engines).
Converts your stock frame into a chopper frame! Look cool, get girls (or at least make friends with others who think choppers are cool)
Keeps your VIN on the stock front section
Highest quality available, world-wide!
Perfect fit and finish.
Made in Cleveland, Ohio, USA.
This weld-on hardtail rear frame section from Lowbrow Customs is an absolute perfect fit on stock 2004-2022 Harley-Davidson Sportsters (Except Revolution Max engines). St ock front frame section and title are not included. These motorcycle hardtails
The Gasbox hardtail frame conversion kit is engineered using the latest CAD technology for high strength, a perfect fit and easy installation. The backbone is thick walled 1-5/8" steel, lower tubes are CNC bent thick walled 1-1/4". The seat post is 1-1/2" diameter. The unique rear engine mount eliminates the stock rubber mounts and cleans up the design for a lean chopper look. All plates are precision CNC laser cut and TIG welded.
Installation see the instructions in the listing below) involves measuring and marking the stock frame for where to cut, cutting off the rear frame section, bolting in the engine to be used as a welding alignment fixture, and welding the hardtail in place to the stock front frame section. The engine is then removed to finish some frame welds and painting. Tools required will be a cut-off wheel or saw, disc sander for weld prep and paint removal, and a TIG or MIG welder. Inexperienced builders may cut and assemble the frame themselves, and have an experienced welder do the welding if they feel their welding skills are not up to the task.
The hardtail kit eliminates the rubber mounts on the engine and converts the frame to a classic rigid chopper rear end with solid mount engine. The kit comes with spacers and hardware to solid mount the rear of the engine. To solid mount the front of the engine, a front solid motor mount kit will be required. To solid mount the top of the engine, a top motor mount bracket will be required. The two stock front rubber mounted rods and brackets will be eliminated as the engine will now be solid mounted.
The hardtail is designed to use the stock length rear axle, eliminating the need for a custom rear axle length. The axle plates are thick, heavy duty, with TIG welded doubler plates for the axle head and axle nut. This localizes any paint scratches from axle tightening to the doublers and away from the axle plates. The hardtail is designed to fit stock 2004-2022 Sportster rear wheels with 1" or 25mm axles (2004 stock rear axles measure 3/4" and will need the 2005-UP rear wheel).
The rear brake will require a rigid-type disc brake caliper mount to pivot on the axle with an anchor rod bolted to the frame, as the stock swingarm mounted caliper bracket will not fit. A brake rod tab is included with the hardtail kit to weld into place. The bracket for a rear brake master cylinder (Harley OEM# 42456-87C) is pre-mounted. This will allow either stock Mid footpegs and brake pedal or stock forward mount pegs, with appropriate length brake rod. The stock rear brake master cylinder and bell crank are removed and not used.
A belt to chain final drive conversion kit is required because of the 2" stretch. The hardtail retains the stock kickstand, Mid footpeg mounts and stock forward control (foot rest) mounting points.
The Lowbrow Horseshoe Oil Tank made specifically for our hardtails and frames (sold separately). It offers easy installation and a perfect fit! The frame is pre-drilled to fit the Gasbox battery box adapter plate to mount a Gasbox Universal Battery Box . This adapter plate is designed so it also serves as a lower rear fender mounting point.
Disclaimer: This weld-on hardtail rear frame section from Lowbrow Customs is designed for installation by skilled and experienced fabricators. We strongly advise that only individuals with appropriate welding and fabrication knowledge and expertise undertake the installation of this product. If you are not a trained and experienced fabricator, we recommend seeking professional assistance or guidance to ensure a secure and precise installation. Lowbrow Customs assumes no responsibility for any damage or injuries resulting from improper installation or use of this product.
Note: There are no returns on carburetors, electrical items, full frames, hardtails or made-to-order items (such as magnetos) unless there is a manufacturer’s defect.
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