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4130 Cr-Mo
Steel Bicycle Frames
Custom steel frames and forks for bicycle brands, builders, and small-batch projects.
Steel Frame Solutions For Different Projects
KratosCycling develops and manufactures 4130 Cr-Mo steel bicycle frames and forks for brands, builders, and custom bicycle projects.
From gravel and road frames to MTB and touring designs, we provide practical frame solutions with support from initial concept review to production.
4130 Cr-Mo Steel
Reliable material choice for durable and versatile steel frames.
Custom Geometry Support
Frame geometry can be reviewed based on your drawings, concepts, or project requirements.
Small-Batch Production
Flexible production support for prototype evaluation and small-volume projects.
Featured Steel Frame Models
4130 Steel Gravel Frames
Versatile steel gravel platforms designed for adventure riding, bikepacking, and all-road applications.
Steel Road Bike Frames
Classic and modern steel road frame platforms combining traditional ride quality with contemporary specifications.
Steel Fixed Gear Frames
Durable and practical steel frames designed for urban riding, track-inspired builds, and custom single-speed projects.
4130 Steel MTB Frames
Strong and reliable steel hardtail MTB frames built for custom mountain bike projects and off-road riding.
Need A Custom Steel Frame Project?
Have a frame concept, geometry drawing, or reference model?
Our team can review your requirements and discuss suitable frame solutions.
