TSB (Tony Step Bike) custom frame engineering focuses on high-durability street, park, and hybrid MTB-street geometries. When building or tailoring an ultimate street and park frame through TSB’s design language, the focus shifts toward extreme structural reinforcement and highly responsive geometry. The Hybrid Street & Park Blueprint
Street and park riding place fundamentally opposing demands on a frame. Street riding requires extreme dent-resistance for rails and ledges, while park riding demands lightweight agility for spins and whips. A true “ultimate” custom hybrid frame synthesizes these needs by balancing thick, reinforced junctions with tight, responsive dimensions. Core Geometry Foundations
To balance stability in the air with fast responsiveness on the ground, custom builders generally look for specific, optimized measurements:
Top Tube (TT) Length: Usually 20.5” to 21”. Shorter top tubes speed up rotations, while longer top tubes offer air stability and extra knee room.
Head Tube Angle (HTA): A steep 75.5° angle is optimal for technical nose manuals and quick steering response.
Chainstay Length (CS): A “slammed” 12.5” to 12.8” rear end pulls the rear wheel forward. This makes the bike incredibly snappy, lowering the effort required to bunny hop, pull up, or spin out of a transition.
Standover Height: An intermediate 8.75” to 9” height keeps the center of gravity balanced. It provides clear foot room for tailwhips without sacrificing the traditional aesthetic of a classic diamond frame. Structural Customization Features
The differentiator in an ultimate build lies in its specialized structural junctions:
Forged Yoke Technology: TSB utilizes a custom forged chainstay yoke. This allows the rear wheel to sit tightly slammed while providing massive clearance for modern, wide 2.4” tires and preventing chainwheel rub.
Multi-Butted Chromoly: Built out of premium, heat-treated 4130 Chromoly tubing. The tubes feature varied wall thicknesses (thicker at the welds, thinner in the center) to maximize impact absorption without packing on dead weight.
Double Internal Gussets: High-stress junctions at the head tube, top tube, and down tube are heavily reinforced with gussets. This eliminates structural flexing and prevents cracking during heavy street drop-ins or harsh casing on park boxes.
Investment Cast Dropouts: Thick, one-piece cast dropouts integrated with built-in chain tensioners provide seamless protection. The smooth contour prevents the frame from catching or hanging up on concrete ledges during grinds. Choosing Your Braking Setup
Custom frame configurations typically dictate two completely distinct paths:
The Brakeless Route: Eliminates all brake lugs and cable guides entirely. This creates a completely clean frame layout that eliminates the risk of catching clothes or shins during tricks.
The Removable Gyro & DBS Hardware: Features pre-drilled holes for gyro tabs and clean cable routings, such as a Dual Brake System (DBS). This allows riders to run an ultra-responsive rear brake setup for tech-park fufanus, abubacas, and air deceleration while keeping the hardware completely detachable. Building a custom BMX bike for street and park riding