Crafted from 4130 chromoly steel (air-hardened for strength), it offers 2x the fatigue resistance of standard 1020 carbon steel—ensuring the frame withstands thousands of miles of riding on varied terrain. Available in diameters from 19mm to 50mm and wall thicknesses from 0.8mm to 3.0mm, it is tailored for different bicycle types, with a smooth surface finish that accepts paint, powder coating, or chrome plating for aesthetic versatility.
Material Durability: 4130 chromoly steel (0.28–0.33% carbon, 0.80–1.10% chromium, 0.15–0.25% molybdenum) delivers tensile strength ≥ 760 MPa and yield strength ≥ 655 MPa (per ASTM A519). This material resists permanent deformation after 1 million cycles of stress testing (simulating rough road vibrations), outperforming aluminum frames by 3x in service life.
Ride Comfort: The steel’s natural elasticity (Young’s modulus of 200 GPa) absorbs road shocks more effectively than carbon fiber, reducing vibration transmission to the handlebars by 35% (tested on cobblestone surfaces). This makes it ideal for long-distance touring and commuting.
Welding Compatibility: Excellent weldability with TIG and MIG processes, producing strong, clean joints that maintain 90% of the base material strength. The pipe’s consistent wall thickness ensures uniform heat distribution during welding, preventing weak points in critical frame areas (e.g., head tube, bottom bracket).
Corrosion Protection: Options include: 1) Zinc electroplating (10–15μm thickness, 2000 hours salt spray resistance); 2) Powder coating (60–80μm thickness, UV and scratch resistant); 3) Chrome plating (for vintage-style frames). All treatments prevent rust from rain, sweat, and road salt.
Mountain Bikes: Used in hardtail and full-suspension mountain bikes (e.g., trail, enduro models) for its impact resistance. The pipe’s strength protects the frame from rock strikes and drops, while its elasticity enhances control on uneven terrain.
Road Bikes: Ideal for endurance road bikes and randonneuring models, where ride comfort and durability are prioritized. The lightweight 4130 steel (1.8kg per meter for 31.8mm OD pipe) balances performance and longevity, outlasting aluminum road bike frames by 5–7 years.
City/Commuter Bikes: Preferred for daily commuting and utility bikes due to low maintenance and corrosion resistance. The pipe’s robustness handles frequent stops, curbs, and heavy loads (e.g., panniers with 20kg capacity).
Q: Is it compatible with standard bicycle frame components (e.g., bottom brackets, seatposts)?
A: Yes—our pipes match ISO standard dimensions for bicycle frames: 34.9mm OD for seat tubes (compatible with 31.6mm seatposts), 44mm OD for head tubes (fit for 1-1/8” forks), and 68mm/73mm bottom bracket shell compatibility. No modifications are needed for component installation.
Q: How much does it weigh compared to carbon fiber, and does it affect speed?
A: A typical 56cm frame made with our steel pipe weighs 1.3–1.5kg, vs. 0.8–1.0kg for carbon fiber. However, the weight difference has minimal impact on speed for casual riders—our steel frame’s aerodynamic profile (when properly shaped) offsets the weight penalty, and its comfort reduces fatigue on long rides.
Q: What is the lead time for custom wall thicknesses, and is there a minimum order?
A: Custom wall thicknesses (0.8mm–3.0mm) have a lead time of 10–14 working days. The minimum order quantity is 5 pieces for custom specifications, with no minimum for standard sizes (in-stock for immediate delivery).
Crafted from 4130 chromoly steel (air-hardened for strength), it offers 2x the fatigue resistance of standard 1020 carbon steel—ensuring the frame withstands thousands of miles of riding on varied terrain. Available in diameters from 19mm to 50mm and wall thicknesses from 0.8mm to 3.0mm, it is tailored for different bicycle types, with a smooth surface finish that accepts paint, powder coating, or chrome plating for aesthetic versatility.
Material Durability: 4130 chromoly steel (0.28–0.33% carbon, 0.80–1.10% chromium, 0.15–0.25% molybdenum) delivers tensile strength ≥ 760 MPa and yield strength ≥ 655 MPa (per ASTM A519). This material resists permanent deformation after 1 million cycles of stress testing (simulating rough road vibrations), outperforming aluminum frames by 3x in service life.
Ride Comfort: The steel’s natural elasticity (Young’s modulus of 200 GPa) absorbs road shocks more effectively than carbon fiber, reducing vibration transmission to the handlebars by 35% (tested on cobblestone surfaces). This makes it ideal for long-distance touring and commuting.
Welding Compatibility: Excellent weldability with TIG and MIG processes, producing strong, clean joints that maintain 90% of the base material strength. The pipe’s consistent wall thickness ensures uniform heat distribution during welding, preventing weak points in critical frame areas (e.g., head tube, bottom bracket).
Corrosion Protection: Options include: 1) Zinc electroplating (10–15μm thickness, 2000 hours salt spray resistance); 2) Powder coating (60–80μm thickness, UV and scratch resistant); 3) Chrome plating (for vintage-style frames). All treatments prevent rust from rain, sweat, and road salt.
Mountain Bikes: Used in hardtail and full-suspension mountain bikes (e.g., trail, enduro models) for its impact resistance. The pipe’s strength protects the frame from rock strikes and drops, while its elasticity enhances control on uneven terrain.
Road Bikes: Ideal for endurance road bikes and randonneuring models, where ride comfort and durability are prioritized. The lightweight 4130 steel (1.8kg per meter for 31.8mm OD pipe) balances performance and longevity, outlasting aluminum road bike frames by 5–7 years.
City/Commuter Bikes: Preferred for daily commuting and utility bikes due to low maintenance and corrosion resistance. The pipe’s robustness handles frequent stops, curbs, and heavy loads (e.g., panniers with 20kg capacity).
Q: Is it compatible with standard bicycle frame components (e.g., bottom brackets, seatposts)?
A: Yes—our pipes match ISO standard dimensions for bicycle frames: 34.9mm OD for seat tubes (compatible with 31.6mm seatposts), 44mm OD for head tubes (fit for 1-1/8” forks), and 68mm/73mm bottom bracket shell compatibility. No modifications are needed for component installation.
Q: How much does it weigh compared to carbon fiber, and does it affect speed?
A: A typical 56cm frame made with our steel pipe weighs 1.3–1.5kg, vs. 0.8–1.0kg for carbon fiber. However, the weight difference has minimal impact on speed for casual riders—our steel frame’s aerodynamic profile (when properly shaped) offsets the weight penalty, and its comfort reduces fatigue on long rides.
Q: What is the lead time for custom wall thicknesses, and is there a minimum order?
A: Custom wall thicknesses (0.8mm–3.0mm) have a lead time of 10–14 working days. The minimum order quantity is 5 pieces for custom specifications, with no minimum for standard sizes (in-stock for immediate delivery).
