ABUS frame lock PRO AMPARO 4750S NR bicycle lock for frame mounting (8.5 mm, security level 9) – Black

The essentials (and what it’s actually for)

A frame lock like the ABUS PRO AMPARO 4750S NR is built for one straightforward job: securing your bike quickly against unauthorised use when it’s parked outside. Instead of taking a loose lock along and dealing with it every time, this one mounts to your bike’s rear triangle, so the lock is part of the bike. The “NR” version also matters in daily use: the key can be removed when the lock is open, which is a small detail but often makes routines less fiddly.

This model is positioned as a higher-security option (it’s given a security level of 9 in the product name), so it’s not meant for “quick stop” minimal protection only. It’s more for people who take their bike seriously and want something stable, reliable and ready to grab.

What you’ll notice day to day

The standout idea here is convenience without compromising on build. Once fitted, you carry the robust frame lock with you. In practice, that usually means less faffing in cold weather, at stations, or in car parks: you park, bring the lock into position and secure your frame immediately.

There’s also an extra layer you can add thanks to the additional lock housing. The base description specifically mentions the option to attach a secondary security device such as an ABUS frame lock chain or an ACL 12/100 connection cable. On paper, that’s the right way to think about frame locks: a single locking point helps, but pairing it with a method to secure the frame and/or wheels is where you start getting practical protection.

One limitation to keep in mind: the description doesn’t spell out exactly which secondary accessories are compatible beyond the examples given. If you already own a different chain/cable system, it’s worth checking before assuming everything will connect neatly.

Key features that matter for buying

ABUS emphasises hardened materials for the load-bearing parts of the locking mechanism, the housing and the shackle. That’s the part you want to focus on when evaluating a frame lock, because it’s what’s most likely to be stressed during an attempted attack.

It’s also designed to mount properly. The base text explains “easy mounting” using the enclosed screws to attach the spoke lock to the rear triangle. If your bike doesn’t have holes available, there’s an alternative approach mentioned: using the LH adapter tensioning strap. That flexibility is useful if you’ve ever struggled to fit a lock because your frame design isn’t cooperative.

Mounting and setup: where people can get it wrong

Even the best lock can be annoying if it doesn’t fit your bike’s layout. Before buying, you’ll want to check whether your rear triangle has suitable fixing points for the enclosed screws. If not, the description says you can use the LH adapter tensioning strap, but again, the product info doesn’t give details about exact fitment criteria.

A practical way to sanity-check: compare where the lock would sit on your rear triangle, and whether there’s room for the lock to operate without rubbing the frame or interfering with parts near the seat stay/chain stay area. If your bike has unusual routing or tight clearances, that’s where a “works in theory” product can become frustrating.

Who it suits (and who should look elsewhere)

It’s a good fit if you want a frame-mounted lock for everyday use and you prefer not to carry a separate lock around. It also suits you if you like the idea of adding a secondary security device using the additional lock housing, because it gives you room to build a more layered setup.

You may want to skip it if your bike’s frame doesn’t match the mounting approach (screw points or the LH adapter tensioning strap) or if you’d rather use a different kind of locking strategy where you control the full configuration each time.

Final verdict

Is it worth it?

Worth considering if you’re after a bike lock that stays with the bike, is designed around hardened steel components, and comes with a higher security level. The key-removal behaviour on the NR version is also a subtle convenience that some riders will genuinely appreciate.

It may not be the best choice if you’re unsure about how your bike’s rear triangle will accept the mounting method described, or if you were expecting a simple “buy and clip on” solution with no checks required. If you prioritise a lock that’s ready to use and built for daily parking, this is the kind of frame lock setup that makes sense.

Quick FAQ

Can you remove the key when the lock is open?

Yes. The “NR” version is described as allowing the key to be removed when the lock is open.

Is it only for locking the bike on its own?

Not necessarily. The description notes you can attach an effective secondary security device to the additional lock housing, such as the mentioned chain or connection cable options.

Does it come with mounting parts?

The base text says the enclosed screws are provided for mounting on the rear triangle, and there’s an alternative LH adapter tensioning strap if no holes are available.

What security level is it?

The product name includes a security level of 9.