Tern GSD replacement key: preserve the code before it is needed

A Tern GSD replacement key enquiry is easier to resolve while the existing key and its code are still available. Printed page eighteen of the Gen 3 QuickStart Guide explains the shared frame-and-battery key arrangement and where the identifying code is supplied. Record that information before a missing key turns it into an urgent search.

Assemble the Tern GSD replacement key record

The guide says the frame lock and battery lock are keyed alike. The same key therefore operates both described locks. It identifies two places for the key code: the card originally supplied with the lock and the key itself. Read the actual code carefully and keep a secure record separate from the bicycle and its routinely carried key.

Record which lock manufacturer the code belongs to, using the actual lock and documents. A bicycle model name is not itself a key-cutting reference. If a lock has previously been replaced, confirm the presently fitted arrangement; do not assume the original shared-key description still establishes what every later key will operate.

Use the manufacturer's replacement route

The guide directs an owner with the necessary information toward replacement through the lock manufacturer. It notes that some manufacturers offer online registration to support that service. Check the current route for the actual lock, keeping the code private rather than including a readable key or code-card photograph in a public bicycle-sale listing.

Losing both key and code is a different enquiry. The guide says a local Bosch dealer may be able to retrieve a code from the Bosch controller, but explicitly warns that this is not always possible or available. Ask what information the dealer needs before arranging the visit, and do not treat controller recovery as a guaranteed service.

Include keys in an actual handover

For a used GSD, check the supplied keys against the current frame and battery locks during the agreed handover. Identify the corresponding code card or private record, and distinguish it from the frame identity or electrical display information. These records answer different questions even though they all belong with the same bicycle.

Keep mechanical access separate from the security plan. The QuickStart Guide recommends a second lock even though the frame lock helps prevent unauthorized use. A replacement key does not add the protection of that second lock, and a working battery key does not prove that an unrelated digital account or app connection has also been transferred. Have any separate electrical handover addressed on its own terms.

Replacement-key FAQ

Where does the guide say the key code is supplied?

On the card originally supplied with the lock and on the key itself; check the actual current lock arrangement.

Can the dealer always recover a lost key code?

No. The guide describes possible Bosch-controller recovery and expressly says it may not be possible or available.

Does a working frame lock remove the need for another lock?

The guide highly recommends a second lock; arranging a replacement key does not replace that separate security decision.

Preserve a private, accurate code record while the existing keys can still be checked. Browse the Tern ownership collection and the related GSD technical guide.

Primary reference: Tern GSD Gen 3 QuickStart Guide, printed p18.