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Hardtail Kits

Throttle Addiction offers weld-on hardtail kits for Sportster and Big Twin Shovelhead / Panhead frames.  Our kits can be purchased in deluxe form or individually.  We offer specific parts that go with each kit so your chopper project can go together as smooth as possible.  

  • Throttle Addiction Deluxe Evolution Sportster Hardtail Kit Throttle Addiction Deluxe Evolution Sportster Hardtail Kit - Seat Options

    Deluxe Evolution Sportster Hardtail Kit

    This weld on Sportster hard tail kit will transform you stock swing arm evolution Sportster into a hard tail chopper in minimal time.  This Kit was original designed and manufactured by the Haifley Bros in Phoenix Arizona.  Throttle Addiction...

    $1,299.99 - $1,699.98
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  • Haifley Bros Evolution Sportster Hardtail - Throttle Addiction Haifley Bros Evolution Sportster Hardtail - Throttle Addiction

    Evolution Sportster Hardtail 1986-2003

    Throttle Addiction is excited to announce that we have purchased all assets and rights to production for the Haifley Bros line of sportster hardtail kits and motorcycle parts.  We will continue producing these parts at the highest quality using the...

    $499.99 - $529.98
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  • Sportster Kit Disc Brake Caliper Bracket - Throttle Addiction Hardtail Sportster Kit Disc Brake Caliper Bracket - Throttle Addiction Hardtail

    Sportster Hardtail Brake Caliper Bracket

    Designed for use with our Evolution Sportster Hardtail Kit. This 3/8" thick weld-on caliper bracket works with the stock 2000-2003 HD Sportster rear disc brake caliper (not included). Includes two piece bracket and retaining hardware. Made 100% in the...

    $44.95
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  • Sportster Hardtail Oil Tank - Throttle Addiction Sportster Hardtail Oil Tank - Throttle Addiction

    Sportster Hardtail Oil Tank

    This oil tank is designed to fit perfectly with the Throttle Addiction weld on Evolution Sportster hardtail.  The center opening is spaced such that an a battery can be placed in it.  It is intended to use our Antigravity battery mounting...

    $329.99 - $354.98
    Out of Stock
  • Sportster Hardtail Sissybar Tall - Throttle Addiction Sportster Hardtail Sissybar Tall - Throttle Addiction

    Hardtail Sissybar - Tall

    These hardtail sissy bars designed for use with our Evo Sportster Hardtail Kit, and 5" flat fender, but can fit on most hardtail frames.  Sissy bars are TIG welded and ready for installation. Constructed of 9/16" round stock with 1/4'" fender...

    $169.99
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  • Rear Chain Adjuster Bolts Chrome - Throttle Addiction

    Rear Axle Adjuster Bolts 3/8 - 24 TPI

    Chrome Rear Axle Adjuster Bolts fit our Sportster hardtail kits.  Sold in Pairs 3/8" X 24TPI X 3" long fits 48-72 Harley Big Twin and custom applications, OEM# 41576-36 Fits our Sportster hardtail kits.

    $12.99
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  • King & Queen Seat Pan - Sportster Hardtail Kit - Throttle Addiction King & Queen Seat Pan - Sportster Hardtail Kit - Throttle Addiction

    King & Queen Seat Pan - Sportster Hardtail Kit

    This King and Queen Seat pan is designed to fit perfectly with our Sportster Evo Hardtail Kit.  May work on other hardtail models. Get the seat pan, take it to your local upholsterer and let them go wild. 16 gauge steel. 100% Made in the U.S.A.

    $169.99
    Out of Stock
  • Sportster Hardtail Battery Tray/Hold Down

    Sportster Hardtail Battery Tray/Hold Down

    Battery tray and hold down designed to secure an Antigravity 12 cell small case battery for use with our Evolution Sportster Hardtail Kit. This weld-on battery tray and hold down mounts to the backside of the seat down tube, allowing the...

    $49.95
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  • DIY Hardtail Sissy Bar Kit - Tall- Throttle Addiction DIY Hardtail Sissy Bar Kit - Tall - Throttle Addiction

    DIY Hardtail Sissy Bar Kit - Tall

    These DIY hardtail sissy bar kits are designed for use with our Evo Sportster Hardtail Kit, and 5" flat fender, but can fit on most hardtail frames.  Constructed of 9/16" round stock with 1/4'" fender strap and mounting tabs. 9" wide between...

    $109.99
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  • Cobra Pleated Seat - Sportster Hardtail Kit - Black - Vinyl - Throttle Addiction Cobra Diamond Seat - Sportster Hardtail Kit - Black - Vinyl - Throttle Addiction

    Cobra Seat For Sportster Hardtail Kit - Pleated

    The Throttle Addiction Cobra seat is designed to fit perfectly on our Evo sportster hardtail.   The front of the seat features a stainless steel tab which slides into the open tube on our hardtail and the back has a tab to bolt to the fender...

    $274.99
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  • Cobra Diamond Seat - Sportster Hardtail Kit - Black - Vinyl - Throttle Addiction Cobra Diamond Seat - Sportster Hardtail Kit - Black - Vinyl - Throttle Addiction

    Cobra Seat for Sportster Hardtail Kit - Diamond Stitch

    The Throttle Addiction Cobra seat is designed to fit perfectly on our Evo sportster hardtail.   The front of the seat features a stainless steel tab which slides into the open tube on our hardtail and the back has a tab to bolt to the fender...

    $274.99
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  • Sportster Hardtail Sissy bar Short - Throttle Addiction Sportster Hardtail Sissy bar Short - Throttle Addiction

    Hardtail Sissybar - Short

    These hardtail sissy bars designed for use with our Evo Sportster Hardtail Kit, and 5" flat fender, but can fit on most hardtail frames.  Sissy bars are TIG welded and ready for installation. Constructed of 9/16" round stock with 1/4'" fender...

    $169.99
    Add to Cart