# Where is the frame number on a Kalkhoff bike?

Canonical: https://www.cyclesite.co.uk/trust/frame-numbers/kalkhoff
Last reviewed: 2026-06-11

**Quick answer:** The frame number on a Kalkhoff bike is most likely to be underneath the bottom bracket or around the lower frame. If it is not there, check the down tube, seat tube, chainstay, rear dropout and motor-area frame sections. There is no Kalkhoff-specific prefix to count on.

On a Kalkhoff, check underneath the bottom bracket first, then the down tube, seat tube, chainstay, rear dropout and motor-area frame sections. There is no single published Kalkhoff serial prefix or fixed location to rely on, so use the full frame number visible on the bike and match it with the original dealer paperwork where possible.

## Start under the bottom bracket.

This is the most common place to find a Kalkhoff frame number. It is the part of the frame between the pedals, on the underside.

1. Put the bike somewhere safe and well lit.
2. Turn it upside down carefully, or place it in a workstand.
3. Look underneath the frame where the cranks meet the bike.
4. Wipe away mud, grease or road dirt.
5. Use a phone torch if the number is hard to read.
6. Take a clear photo before typing the number into a checker.

### If it is not under the bottom bracket

- Near the rear dropouts, where the back wheel fits into the frame.
- Around the seat tube.
- On the underside of the down tube.
- Near the head tube at the front of the bike.
- On the original sales receipt.
- In your Kalkhoff registration email or paperwork.
- With the Kalkhoff dealer that sold the bike.

## What a Kalkhoff frame number looks like

A Kalkhoff frame number should be a unique alphanumeric code on the frame. It may be stamped, engraved or label-based depending on model and year. On Kalkhoff e-bikes, do not confuse the frame number with the motor, battery, display or charger serial number.

### Not the frame number

- Kalkhoff Image
- Kalkhoff Endeavour
- Kalkhoff Entice
- Kalkhoff Agattu
- Kalkhoff Berleen
- Kalkhoff Sahel
- Kalkhoff Pro Connect
- Bosch motor number
- Shimano motor number
- Impulse motor number
- Battery serial number
- Display serial number
- Charger number
- Wheel size
- CE marking alone

## Ask for the battery history too

Kalkhoff used bikes are often practical e-bikes, which means the paperwork and battery history matter as well as the frame number. Ask for the frame number, battery details, charger, keys and original dealer receipt before buying.

## Buying a used Kalkhoff

A clean-looking bike is not always a safe buy. Before you pay, ask the seller for a clear photo of the frame number and check it against stolen-bike records. You should also ask for:

- The original receipt or proof of purchase.
- The seller’s name matching the receipt where possible.
- Clear photos of the bike from both sides.
- A photo of the frame number.
- Any service history.
- Details of upgrades or replacement parts.

## Bottom line

The quickest place to find a Kalkhoff frame number is underneath the bike, near the pedals. Look for a stamped code or barcode sticker, copy the full number, then check it before you buy, sell or register the bike. A used Kalkhoff can be a brilliant buy, but the frame number is the detail that protects you.

## Frequently asked questions

### Is a Kalkhoff frame number the same as a serial number?

Yes. Most people use frame number and serial number to mean the same thing. It is the unique identifying code attached to the bike frame.

### Do all Kalkhoff bikes have a frame number?

Most Kalkhoff bikes have a frame number or serial number. Check the locations described above first; on older frames the marking can be shallow or worn, so clean the area and check in good light before concluding it is missing.

### Where is the frame number on a Kalkhoff Image?

Start underneath the bottom bracket, then check the lower down tube and motor-area frame sections.

### Where is the frame number on a Kalkhoff Endeavour?

Check underneath the bottom bracket first. On e-bike versions, record the frame number separately from motor and battery numbers.

### Where is the frame number on a Kalkhoff Entice?

Start around the bottom bracket and motor-area frame sections, then check the down tube and seat tube.

### Where is the frame number on a Kalkhoff Agattu?

Check underneath the bottom bracket first, then the lower frame and rear dropout.

### Is the Bosch number the same as the Kalkhoff frame number?

No. Use the Kalkhoff frame number for stolen-bike checks and ownership records.

### What if the Kalkhoff frame number has been removed?

Do not buy the bike. A removed or damaged frame number is a major red flag. It may make the bike harder to register, insure, resell or prove as yours.

### Can I check if a Kalkhoff bike is stolen by the frame number?

Yes. Use the frame number to run a stolen-bike check before buying. You should also ask the seller for proof of ownership and check that the details match the bike.

### How do I register a Kalkhoff bike in the UK?

Find the frame number using the locations described above, then record it against your Kalkhoff. It is free, and you need an account so we know where to send the alert. If that exact number is ever reported stolen to us, we email you. If anyone then lists a bike carrying it, the listing is hidden until the seller proves it is theirs.

## Related pages

- Free stolen-bike check: https://www.cyclesite.co.uk/stolen-bikes
- What a used Kalkhoff is worth: https://www.cyclesite.co.uk/value/kalkhoff
- Stolen Kalkhoff bikes: how to check one before you buy: https://www.cyclesite.co.uk/stolen-bikes/guide/stolen-bikes-by-brand-kalkhoff
- Used Kalkhoff prices by model: https://www.cyclesite.co.uk/value/kalkhoff
- Used Kalkhoff bikes for sale: https://www.cyclesite.co.uk/bike-brands/kalkhoff
- Frame numbers for other brands: https://www.cyclesite.co.uk/trust/frame-numbers

Source: Cyclesite editorial, reviewed 2026-06-11. HTML version: https://www.cyclesite.co.uk/trust/frame-numbers/kalkhoff