Serial 1 e-bikes can have several serial numbers, but the one that matters most for ownership is the main bike frame serial number. Component serials may identify parts, but they do not replace the frame serial. If you are buying used, ask for the frame serial number, not just a motor, battery or charger number.
That number matters. It helps you register the bike, check if it has been reported stolen, prove ownership, value it and sell it with more buyer confidence. Here is where to find it, how to read it, and how to check it before you buy.
Check a Serial 1 frame number
Free, instant, no signup. Enter the number stamped on the frame to check it against the UK stolen-bike databases.
Serial 1 says each bike has one main frame serial number, plus other serial numbers for parts and components. Use the general bike frame serial number for ownership, insurance, support and stolen-bike checks.
Start under the bottom bracket.
This is the most common place to find a Serial 1 frame number. It is the part of the frame between the pedals, on the underside.
- Put the bike somewhere safe and well lit.
- Turn it upside down carefully, or place it in a workstand.
- Look underneath the frame where the cranks meet the bike.
- Wipe away mud, grease or road dirt.
- Use a phone torch if the number is hard to read.
- Take a clear photo before typing the number into a checker.
Make sure you copy the full number. A single missing or misread character can give the wrong result.
Can’t find it underneath the bike?
If the number is not under the bottom bracket, check these places next:
- The original purchase paperwork or dealer record.
- The Serial 1 registration or support record.
On older bikes, repainted frames and heavily used bikes, the number can be harder to read. If it has been scratched off, covered, filed down or looks tampered with, treat that as a serious warning sign.
What does a Serial 1 frame number look like?
Use the full frame serial number exactly as shown on the bike and paperwork. Serial 1 support guidance says specific digits in the frame serial can even identify the bike’s generation. Do not use a battery, motor, charger, display or component serial as the bike frame number.
Do not use the model name, tyre size, barcode on a shop label, or any number printed on a component. The frame number belongs to the bike frame itself. For example, these are not usually the frame number:
- Serial 1 Mosh
- Serial 1 Rush
- MOSH/CTY
- RUSH/CTY
- RUSH/CTY SPEED
- BASH/MTN
- Harley-Davidson badge
- Battery serial number
- Brose motor number
- Charger number
- Display serial number
- Controller number
- Wheel serial number
The number you want is the unique frame code that belongs to the frame itself.
One frame serial among many part serials
The key Serial 1 issue is multiple serials. The bike has a main frame serial number and separate part serials. For ownership, insurance and stolen-bike checks, use the main frame serial number.
The detail that protects you.
A frame number is one of the most useful details on a used bike. It connects a Serial 1 to its owner, its registration record and any stolen-bike reports.
You may need it to:
- Check if a Serial 1 bike has been reported stolen.
- Register your bike.
- Sell your bike with confidence.
- Get an accurate bike valuation.
- Make an insurance claim.
- Report a stolen bike to the police.
- Prove the bike is yours.
If you own a Serial 1, take a photo of the frame number and keep it with your receipt. If the bike is ever stolen, that detail can make a real difference.
Buying a used Serial 1? Check the frame number first.
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.
Red flag. Be careful if the seller refuses to show the frame number, says they cannot find it, gives only a partial code, or pressures you to pay quickly. A genuine seller should understand why you are checking.
Check a Serial 1 frame number on Cyclesite
Found the number? Run a free stolen-bike check before you buy. Enter the Serial 1 frame number into the checker and look for any matching reports. It only takes a moment, and it can help you avoid buying a bike with a bad history. If the bike looks clear, you can also value it and compare similar Serial 1 bikes for sale.
What to do if your Serial 1 has been stolen.
Report it as soon as possible. You will usually need the frame number, photos, make, model, colour, size, location and any unique marks or upgrades.
- Report the theft to the police.
- Get a crime reference number.
- Add the bike to stolen-bike databases.
- Update any existing bike registration record.
- Contact your insurer if you have cover.
- Watch used bike listings for matching bikes.
- Keep photos, receipts and messages in one place.
Include anything distinctive, such as upgraded wheels, unusual tyres, scratches, stickers, lights, mudguards, racks or replacement parts. The more detail you provide, the easier it is to identify the bike if it appears for sale.
Serial 1 frame number FAQs
Where is the frame number on a Serial 1 MOSH/CTY?
Use the main bike frame serial number, not the battery or component serial. Check the frame and original paperwork.
Where is the frame number on a Serial 1 RUSH/CTY?
Ask for the general bike frame serial number and match it with proof of purchase.
Is the battery number the Serial 1 frame number?
No. Serial 1 says the bike has several serial numbers, but the frame serial is the main bike identifier.
Can the Serial 1 frame serial tell the generation?
Yes. Serial 1 says specific digits in the frame serial can help identify whether the bike is first-generation or current-generation.
Can I check if a Serial 1 is stolen by frame number?
Yes. Use the main frame serial number to run a stolen-bike check before buying, and ask for proof of purchase.
Looking for another brand? See the full bike frame number guide.
Bottom line
The quickest place to find a Serial 1 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 Serial 1 can be a brilliant buy, but the frame number is the detail that protects you.
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Editorial standards
Last reviewed by the Cyclesite editorial team. Published by Cyclesite, Companies House No. 13238473.