# What carbon data should a Ludhiana cycle maker get from its steel tube supplier?

Canonical: https://senseible.earth/answers/ludhiana-cycle-frame-steel-tube-carbon-data

Ask the tube maker for kg CO2e per tonne of tube, with the steel route behind it, the year and the boundary. Steel tube is usually most of a steel frame's footprint, so a real supplier figure matters more than your own welding and painting, which come from your bills.

## What to ask for

- kg CO2e per tonne of tube at the tube mill's gate.
- The coil or strip supplier and its route: blast furnace, DRI or scrap based.
- The year, and whether it is site specific or an average.

## Your part

Cutting, bending, brazing or welding, phosphating and painting, from your electricity, LPG or PNG bills, split by frames made.

## CBAM note

Steel tubes themselves are CBAM goods if exported to the EU, but bicycles and frames are not, so a frame maker exporting finished cycles buys no certificates.

## What Senseible does here

Senseible reads steel, fuel and electricity invoices into a dated, fingerprinted record, so the tube tonnes and energy behind a frame figure trace back to the documents.

- [Bicycles and CBAM](https://senseible.earth/answers/are-bicycles-and-bicycle-parts-covered-by-cbam)
- [Ludhiana bicycle maker CBAM check](https://senseible.earth/answers/ludhiana-bicycle-maker-cbam-check)
- [Bicycle footprint per unit](https://senseible.earth/answers/bicycle-carbon-footprint-per-unit)

Sources: [ISO 14067:2018, Carbon footprint of products (iso.org)](https://www.iso.org), [GHG Protocol Corporate Value Chain (Scope 3) Standard](https://ghgprotocol.org/corporate-value-chain-scope-3-standard), [Regulation (EU) 2023/956 (CBAM Regulation), consolidated](https://eur-lex.europa.eu/eli/reg/2023/956/2025-10-20)

Last reviewed 2026-10-21.