Invincible 1Speed

Frame Dimension

A smooth, solid ride designed to survive the city:

  • Custom security bolts that keep your bike components protected from thieves
  • Puncture-resistant tires to prevent flats
  • Rust-stopping frame + chain
  • Weather-proof saddle 
  • Free shipping in the U.S.
  • Comes 80% assembled. You do the rest with our awesome online assembly instructions


  • To get a replacement bike or component in the mail if yours is ever stolen, add our theft replacement guarantee. How our guarantee works.

    To activate your theft protection, you must register your bike online within 30 days of delivery: fortifiedbike.com/register

  • Simple Sizing Guide:
     
    Small: 5'2"-5'6" (50cm)
    Medium: 5'7"-5'11" (54cm)
    Large: 6'0"-6'-4" (58cm)
     
    *Our bikes run slightly large
     
    Advanced Sizing Guide
  • Weight: 23 Pounds (Total Weight)
    Frame: 700c Road Single Speed - 6061 Rustproof Aluminum, 1-1/8” Semi-Integrated Head Tube Horizontal Drop-Outs, Rack & Fender Mounts
    Fork: Fortified 700c 6061 Aluminum Fork With Rack & Fender Mounts with Clearance for Fenders
    Handlebars: Promax 15 degree 20mm rise
    Brakes: Promax Dual Pivot Caliper w/ Quick Release Arms
    Brake Lever: Promax Road Lever, Cross Lever
    Tire: 700 x 32 with Puncture Protection
    Chain Tensioner: Dual Adjustable Chain Tensioner
    Chainring: Prowheel Steel Chainring, Alloy Guard & Arm, 42T
    Crank: ProWheel Crank, Square Taper, 175mm
    Chain: KMC Rustbuster
    Decal: Fortified Retroflective Decal
    Security Bolts: Fortified Proprietary Stainless Steel Water Bottle Screws, Top Cap Bolt, Stem Face Plate Bolts and S/S Bolts
    Wheel Locks: Delta Fort Knox locking hub nuts
    Weight Limit: 270 Pounds

Features

Proprietary Security Bolts
Waterproof Saddle
Puncture-proof Tires

Fortified Theft Protection

If your bike gets stolen


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