Heartbreaker BMX Frame Chris Harti Signature

The Heartbreaker is a USA-made trails-specific BMX frame designed by Chris Harti for high-speed, big-jump riding. It runs a long, low geometry with a mellow head tube angle, low BB height, and extended rear end — all deliberate choices for riders who prioritize stability and control at speed over technical street or park performance.

Key Features

• Butted Supertherm top tube — Butted tubing removes material from low-stress mid-sections while retaining thickness at weld points, reducing weight without compromising strength where it matters
• Straight gauge Supertherm down tube — Consistent wall thickness throughout the down tube provides maximum strength in a high-load area that takes significant impact force at trails
• Double gussets — Additional gusseting at stress points reinforces the frame against the repeated high-impact landings typical of trails riding
• Slightly tapered seat stays and single bend chain stays — Tapered stays absorb trail vibration and reduce overall rear-end weight while the single bend chain stay profile provides clearance and a clean classic aesthetic
• 2.4" tire clearance even when slammed — Full tire clearance is maintained regardless of seat height adjustment, preventing tire rub on oversized rubber commonly run at trails
• Double butted seat tube — Butted construction reduces weight at the seat tube while maintaining weld integrity at the top and bottom junction points
• Longer dropout slots with 4Q baked 14mm 3/16" dropouts — Extended slots provide more wheel positioning range to accommodate ideal gearing across 9, 10, and 11 tooth sprocket combinations; 4Q baking relieves post-weld stress for stronger, more consistent dropouts
• Welded-on chainstay brake mounts — Fixed brake mounts on the chainstay provide a more rigid and reliable brake mounting point than bolt-on alternatives, reducing flex under braking
• Thru-seat tube cable routing — Routes the brake cable internally through the seat tube, preventing the straddle hanger from contacting the down tube during riding — particularly relevant given the longer rear end length on this frame
• Double down tube cable guides — Dual guides keep the brake cable tracked cleanly along the down tube without rattling or shifting position
• Traditional slot seat clamp — No welded-on seat clamp keeps the aesthetic clean and allows use of a standard aftermarket clamp
• Engraved head tube logo — Engraved Heartbreaker branding on the head tube rather than a decal or sticker finish
• Made in USA — Domestic production with Supertherm tubing and 4Q baked heat treatment throughout

Technical Specifications

• Brand: Heartbreaker
• Rider: Chris Harti (signature)
• Top tube lengths: 21", 21.25", 21.5"
• Rear end length: 13.8"–14.5"
• Head tube angle: 74.5°
• Seat tube angle: 71°
• BB height: 11.35"
• Standover: 9.15"
• Head tube: Integrated
• Bottom bracket: Mid
• Dropouts: 14mm, 3/16" thick, 4Q baked
• Brake mounts: Chainstay welded
• Seat clamp: Traditional slot
• Seat post diameter: 25.4mm
• Weight: 21" — 5.18 lb (2.35 kg) / 21.25" — 5.27 lb (2.39 kg) / 21.5" — 5.3 lb (2.4 kg)
• Country of manufacture: USA

Ideal Gearing Chart

11 Tooth Driver 28/11 and 30/11 combinations cover 13.875" to 14.375" depending on half link use

10 Tooth Driver 27/10, 28/10, and 30/10 combinations cover 13.875" to 14.25" depending on half link use

9 Tooth Driver 25/9, 27/9, and 28/9 combinations cover 13.875" to 14.375" depending on half link use

Compatibility and Ideal Use Cases

Built exclusively for trails riding and high-speed jump lines. The 74.5° head tube angle, 11.35" BB height, and extended rear end are not optimized for street or park use — this geometry is purpose-built for maintaining control and stability at speed on dirt. The longer dropout slots and included gearing chart make it straightforward to dial in chain tension across a range of sprocket and driver combinations without a half link. Seat post is 25.4mm — a less common size than 27.2mm, so confirm post diameter before purchasing a replacement. Brake cable routing through the seat tube requires a brake setup compatible with internal routing.