The Abus Pro Amparo 4750 frame lock embodies the Dutch philosophy of urban security: one move, one click, your bike is locked. Developed for urban cyclists and e-bike users, this frame lock offers reliable basic protection level 9/15 against opportunistic theft, while allowing ultra-fast daily use. Designed with an opening adapted to wide tires, it installs directly on the frame's seat stays and instantly blocks the rear wheel.

Technical summary and usage philosophy

Frame locks constitute the essential basic protection for any European urban bike or e-bike. The Abus Pro Amparo 4750 stands out with its 8.5 mm diameter hardened steel shackle, robust locking mechanism and compatibility with plug-in chains and cables Abus (sold separately) to extend the protection zone. Security level 9/15 according to the Abus scale: ideal for short stops in low-risk areas or as a complement to a main lock in dense urban areas.

Available variants

• Version X (standard clearance 68 mm): Suitable for urban bikes, trekking bikes, classic city bikes with tires up to 55 mm width. Available in NR (non-key retaining, EAN 4003318693496, Ref. 69349) or R (key retaining, EAN 4003318693526).
• Version XL (extended clearance 89 mm): Specially developed for e-bikes, cargo bikes, mountain bikes and bikes equipped with extra-wide tires (up to 75 mm) or bulky fenders. Available in NR (EAN 4003318693533, Ref. 69353) or R (EAN 4003318693540, Ref. 69354).
• Cylinder type NR vs R: The NR version (Non key Retaining) allows the key to be removed at any time, even when the lock is open. The R version (key Retaining) retains the key in the cylinder when the lock is open, ensuring you don't forget to lock when leaving.
• OE versions (Original Equipment): Some variants include the OE designation, indicating enhanced compatibility with Bosch e-bike battery locks and the Abus One Key system (keyed alike).

Technical highlights

• 8.5 mm hardened steel shackle: The housing, shackle and load-bearing elements of the mechanism are made of case-hardened special steel, offering high resistance to cutting or twisting attempts.
• Adapted wheel clearance: Version X with 68 mm internal width (tires up to 55 mm), version XL with 89 mm (tires up to 75 mm). Perfect for wide tires on e-bikes and cargo bikes.
• Locking mechanism for accessories: Allows easy connection of Abus plug-in chains or cables (6KS series, Plug-in Chain) directly into the lock body to extend protection to a fixed point.
• ABUS Plus cylinder (depending on version): High protection against picking and manipulation. Compatible with the One Key system to use a single key on multiple Abus locks.
• Versatile installation: Mounting on seat stays via threaded inserts or LH clamps (optional, not included). Spacing between mounting holes: 101 mm minimum, 115 mm maximum.

Recommended use and complementarity

Abus classifies frame locks as basic protection and strongly recommends using a second lock (U-lock, reinforced chain, Bordo folding lock) for extended parking or in medium/high risk areas. The frame lock is ideal for quick stops (bakery, post office, school) where the bike remains under visual surveillance. For maximum security, combine it with an Abus plug-in chain (e.g.: 6KS/85, 6KS/110) or a Granit U-lock.

Manufacturing and quality standards

Manufactured in Germany by August Bremicker Söhne KG (Abus), the Pro Amparo 4750 frame lock benefits from over 95 years of expertise in mechanical security. Tested according to ICE SPRAY standards (frost resistance) and evaluated according to the ABUS Global Protection Standard classification system. Supplied with 2 keys and code card for ordering replacement keys or keyed alike. Manufacturer's warranty according to Abus conditions.

Dimensions and compatibility

• Total height: 120 mm
• Wheel clearance width: 68 mm (X) or 89 mm (XL)
• Mounting spacing: 101 mm to 115 mm (between screw holes on seat stays)
• Weight: 860 g (version X), 800 g (version XL according to sources)
• Compatible with: Urban bikes, trekking bikes, e-bikes, cargo bikes (version XL), bikes equipped with hub gears, disc brakes, fenders