ABUS frame lock PRO AMPARO 4750S R frame-mounted bicycle lock (8.5 mm) in black
Product description
The essentials
A frame-mounted lock is one of those purchases that only feels “obvious” once you’ve used it a few times. The ABUS frame lock PRO AMPARO 4750S R is designed to be fitted to the bicycle frame, so you can secure the bike against unauthorised use without having to carry a bulky locking setup around every day. It’s the kind of lock aimed at regular commuters or anyone who wants dependable protection for everyday parking.
On paper, it leans into ABUS’s usual approach: sturdy, hardened steel where it matters, and a build that’s meant to stay put on the bike. The R version also has a small but practical difference: the key remains in the lock while the lock is open. That’s not a spec everyone thinks about, but it can change how smoothly you live with it day to day.
Key features
What stands out most is how the lock integrates with the bike. Once mounted on your rear triangle (using the enclosed screws, or an adapter tensioning strap if your frame doesn’t have holes), the lock is always with you. That makes it feel more like part of the bike than a separate accessory you’re constantly reaching for.
You also get an additional security route via the lock housing. The design is set up so you can attach a secondary security device, such as an ABUS frame lock chain or an ACL connection cable (12/100 is mentioned in the base description). This is useful if you park where “good enough” isn’t enough, because it gives you a way to increase protection without only relying on the frame lock itself.
What you’ll notice in everyday use
In real life, the biggest benefit of a frame lock is speed and routine. Think about a quick stop: you park up, open/close the mechanism on the bike, and you’re done. You’re not juggling a separate U-lock or threading a chain through multiple points while the rest of your trip gets pushed back.
There is, however, a limitation to keep in mind: this is a frame lock, so your mounting situation matters. If your frame has no suitable holes, the option to use the LH adapter tensioning strap can help—still, the fit process is something you’ll want to plan for before you commit.
Tech specs
- Security level: 9
- Lock type/placement: frame lock for mounting on the bicycle frame
- Shackle size: 8.5 mm
- Colour: Black
- Material (locking mechanism areas): specially hardened steel (for load-bearing parts, housing and shackle)
Where it shines (and where it may not)
This lock makes sense if you want mobile, frame-based security for routine stops—home parking, property security, or mobile security when you’re out and about. It’s also the sort of choice that suits riders who prefer stability and a consistent locking setup.
It might not be the best match if you don’t want something permanently mounted to the frame, or if your bike’s rear triangle mounting points don’t suit the provided method. It’s also not ideal if your idea of security is purely “one lock does everything”, the ability to add a secondary device is a core part of how this package is meant to be used.
Compatibility & requirements
To use it, you’ll need a rear triangle area where you can mount the lock. The base information mentions two approaches: using the enclosed screws, or using the LH adapter tensioning strap if no holes are available. If you’re unsure, it’s worth checking your frame’s rear triangle for mounting suitability before ordering.
Mini FAQ
Does the key stay in the lock?
With the R version, the key remains in the lock as long as it is open.
Can I add extra protection?
Yes—there’s an additional lock housing intended for attaching a secondary security device, such as the ABUS frame lock chain or an ACL 12/100 connection cable.
How is it mounted to the bike?
You use the enclosed screws to attach it to the rear triangle, or you can use the LH adapter tensioning strap if no holes are available.
What materials is the locking mechanism made from?
The load-bearing parts of the locking mechanism, the housing, and the shackle are made from specially hardened steel.
Final verdict
If you’re looking for a frame-mounted bicycle lock that you can keep on the bike for day-to-day use—rather than carrying around a separate locking solution—the ABUS frame lock PRO AMPARO 4750S R is worth serious consideration, especially if you like the idea of bolting on extra security via the additional lock housing. It’s also a solid pick if you prioritise security level 9 and hardened steel construction.
You may want to skip it if you can’t mount it comfortably on your rear triangle (or you’d rather not fit anything permanently). In that case, a different locking style might fit your bike setup and routine better.