How much does a custom steel frame weigh?
It is one of the questions I get asked most often, online and in the workshop. I answer directly, with the values that come from my experience as a frame builder.
The materialIt is the factor that affects the final weight of a frame the most.
Weight is not everythingSome heavier bikes ride beautifully and some very light ones disappoint: ergonomics, build quality and road behaviour matter too.
A light frame is an advantage on climbs, but judging a bike by weight alone means ignoring the rest. If your goal is the absolute minimum weight, the choice is carbon, the lightest material for racing frames.
The numbers compared
Carbon frame
From top-end to good-quality models
from about 700 gtop-end models, weight declared by the manufacturer
- Example: Specialized declares 685 g for the S-Works Tarmac SL8 frame alone (source)
- In my experience a good-quality carbon frame weighs about 1 kg
- Cheap frames often declare lower weights, but do not always guarantee safety and reliability
- Standard sizes (S, M, L, XL) with fixed geometries: often it is the body that has to adapt to the frame
Custom steel frame
High quality, handmade
1.45 to 1.9 kgweights checked in the workshop on the frames I build, depending on the type of frame and the measurements
- Compared with a good carbon frame of about 1 kg the difference is from about 450 g to about 900 g; compared with the lightest top-end frames it can be more than 1 kg
- Geometry, materials, cable routing and looks designed around your measurements
- Every frame is unique: the weight depends on your build and riding style
The steel frame weights are those I check in the workshop on my own builds; carbon weights are figures declared by manufacturers or, where stated, my experience.
The proof: a steel bike under 7 kg
It is the bike I ride every day, in training and on rides with friends and customers who come to visit me in Gesualdo. You can see it in person and discover the racing bikes and frames.
Is steel really worth choosing?
Before deciding, ask yourself:
- Does that weight difference (from about 450 g to just over 1 kg, depending on the frame and the carbon frame you compare with) really affect your riding experience?
- How much does it matter to you to have a bike built around your real measurements?
- Do you prefer a unique frame, designed to last and to offer a more natural ride?
Choosing a custom frame is like choosing a tailored suit: comfort, durability and harmony are different from a standard product.
An example of a broken carbon frame
A light frame is not necessarily a reliable one. Two examples of failures on carbon frames: