How do I identify a sliding bay scoop without reference?

This technical guide explains to carpenters, millers and real estate maintenance technicians in France (Paris, Lyon, Marseille, Bordeaux) and everywhere in Europe (Germany, Spain, Belgium) how to identify a worn-out sliding bay pane without reference, raise the right odds and find the detached aluminium bay pane suitable — until the remanufacture of a custom-made trolley for old aluminum carpentry.

A sliding aluminium that hangs, a window bay that has become difficult to maneuver, or a persistent metal grinding at each opening... No doubt: the rollers of the bay window are tired.

Access our repair guide and optimize your aluminum carpentry works

The problem: the hell of obsolete and invisible sliding bay wheels

On windows installed 15, 20 or 30 years ago, finding the right piece of aluminium carpentry is often a puzzle. At the time, many gammists and manufacturers used aluminium profiles and specific trolleys.

If you remove the sliding to change the roller, you will face three major issues:

• The absence of marking: brands such as Giesse, Savio, Fapim, Technal, Schüco or K-Line did not systematically record serial numbers visible on the pebbles' cages.
• The requirement for millimeter ratings: In contrast to an aluminium window handle or a doormat, two visually identical trolleys may differ by 0.5 mm over the width of the cage, making installation impossible in the opening throat.
• The obsolescence of the catalogue: the profile manufacturer has sometimes closed its doors, or the range has not been followed for decades.

The Queen method: the 4 essential measures for the back-to-back foot

For roller bearings, mechanical geometry takes precedence over everything else. The human eye and the photo algorithms have their limits: only a rigorous check-up ensures the right choice. Get a professional backstage foot and get these 4 values:

• The width of the carriage cage: It must be inserted to the nearest millimetre in the throat of the aluminium profile.
• The total height of the trolley (minimum and maximum): Whether fixed or adjustable, it determines the alignment and upgrade of the bay window.
• The diameter of the roulette (galet): whether it is a single (monogalet) or double (tandem) model.
• The shape of the throat: V-throat roller (for sliding aluminium rail in point) or U-throat roller (for round rail).

Scan IA: a first filter to guide you

On our DirectAlu.com marketplace, you have our Scan IA tool, developed in partnership with Open Global Solutions (OGSo).

Scan my piece to orient my search in 3 seconds

Let's be transparent: for the family of pebbles and carts, the photo alone can't do a miracle. The training of AI on these parts is complex because an image cannot guess the exact entry or internal width of a recessed component.

However, Scan IA is very useful as the first filter. By photographing your used trolley on the site (in Paris, Madrid, Berlin or anywhere in Europe), the application analyzes its overall architecture. It immediately eliminates 90% of incompatible models and directs you to our partners' product families such as Rousse Roulettes, La Croisée DS, or ALU K. It is then up to you to validate the final piece thanks to the data sheets listed on our site.

Too old or impossible? Opt for the custom new trolley

What happens if your measurements do not correspond to any market reference or if the model is definitely exhausted in Europe? Where general marketplaces abandon you and force you to offer a complete (and ultra-cost) replacement of carpentry to your customer, DirectAlu activates its industrial network.

Refabrication: the ultimate circular solution

Thanks to our exclusive custom-made trolley manufacturing service, we are reviving the oldest aluminium carpentry ranges.

• How does it work? If the identification confirms that the spare part for sliding bay closure is not found, you will send us the worn scoop or its ultra-precise dimensions plan.
• Industrial expertise: In collaboration with our partner factories and logistics hub (which for example connects precision workshops in Barcelona with artisans based in Berlin or Paris), we are launching the design of a new trolley.
• The result: within a few days you will receive a brand new rolling kit, equipped with rollers in ultra-resistant modern materials, perfectly suited to the old aluminium profile.

This approach extends the life of buildings, avoids waste of raw materials and is at the heart of our mission of circular economy of the second work.

Summary of pebble research methods

Criteria of choice	Classic manual search	Market places B2C (ManoMano...)	DirectAlu — Listed & Scan IA
Search time	Long (multiple catalogues)	Random and risky	Quick (pre-filtering by IA and validation of ratings)
Technical accuracy	Risk of high error	Incomplete product sheets	Maximum (technical sheets rated per millimetre)
Solution obsolete parts	None	None	Custom-made new trolley (exclusive DirectAlu)
Origin of stocks	Partitioned local distributors	Third-party consumer	Large manufacturers (Rousse Roulettes, La Croisée DS...)

Conclusion: Do not change the window, measure and change the scoop!

Changing a sliding bay scoop without reference requires method. By combining your craftsmanship (the measurement at the back of the floor), the pre-screening of our application developed with Open Global Solutions, and our unique ability to re-manufacture your custom-made new trucks, DirectAlu.com is the most transparent and technical partner in your aluminium carpentry projects in Europe.

Find my scoop model and buy my spare part on DirectAlu

Frequently Asked Questions

How do I identify a sliding bay scoop without reference?

Demonstrate the cart and lift four sides behind the foot: the width of the cage, the total height (mini/maxi), the diameter of the scab and the shape of the throat (V or U). These measures are sufficient to find a compatible part, or to launch a custom refabrication if the reference is not found.

Can we still find spare parts for an old aluminium sliding bay?

Yes. Even when a range is out of date or the manufacturer has disappeared, DirectAlu.com mobilizes its network of large manufacturers (Rousse Roulettes, La Croisée DS...) and, as a last resort, remanufactures the custom-made new trolley from your dimensions.

How do I fit a sliding aluminium rail and its roller correctly?

Clean the throat of the profile, insert the new scoop according to its throat shape (V for rail in point, U for round rail), then adjust the height to align the bay window before controlling the flexibility of the sliding.

What is the difference between a monogalet and a tandem cake?

The monogalet supports a moderate load on a single roulette, while the tandem wafer distributes the weight of a heavy vantail on two roulettes. The choice depends on the weight of the glazing and the original model on your carpentry.

Also read: How to replace an alu window cremon step by step.