Can I insure a bike without a serial number?
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Yes. A serial number is not a condition of the policy: a quote asks for the bike's type, make, model, and the value you want it insured for, and the policy form does not list a serial number among its conditions for coverage or for a theft claim. A custom frame, a vintage bike, or a bike whose number has worn away can be insured at the value you set, following how to value your bicycle.
Record the number anyway when the bike has one. It is how the police match a recovered bike to its owner, and fewer than 5% of stolen bikes are ever recovered, so a registered number is one of the few things that improves those odds. Photograph it, register it with Bike Index, and keep it with the purchase receipt. At claim time, the police report, your receipts, and dated photos of the bike establish the loss; the walkthrough is in what to do if your bike is stolen.
Where is the serial number on a bike?
Stamped or printed on the underside of the bottom bracket shell, where the cranks meet the frame, on most bikes; flip the bike over and read it there. Other common spots are the head tube, the rear dropout, the underside of the down tube, and the seat tube. E-bikes usually carry the frame number on a sticker near the bottom bracket, and the motor and battery have serials of their own. The number is also on the original receipt, the box, and the manufacturer's warranty registration, and any bike shop can locate it in a minute. Our find your bicycle serial number guide marks every one of those spots on a bike diagram.
What if my bike was made without a serial number?
Insure it at its value and build the ownership file another way: dated photos of both sides of the bike and of anything distinctive about it, such as custom paint, decals, or a one-off component, plus the receipt, bill of sale, or frame builder's invoice. Register it anyway, because registries accept a bike listed as made without a serial number and rely on the photos instead. One thing to watch when buying used: a number that has been filed off is the mark of a stolen bike, so check the number against Bike Index before you pay, as laid out in how to buy a used bike.
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