Kappa K638 Foam Passenger Backrest – K466 Urban, K400 and K355 Top Cases
€30,90
€40,00
-22%
Skip to product information
Kappa K638 Foam Passenger Backrest – K466 Urban, K400 and K355 Top Cases
€30,90
€40,00
-22%
Taxes included.
Shipping calculated at checkout.
Code: K638
Only 2 pieces left
Same-day dispatch
Order within
and your item ships
Pickup available at Moon Bike S.r.l.
Usually ready in 1 hour
Shipping notice: truck drivers' strike in Italy
Updated 19/10/2026
Since 16 October, truck drivers protesting against high diesel prices have been blocking roads and ports in Southern Italy (Campania, Calabria, Sicily, Puglia, Basilicata), and the protest could spread to the rest of the country. The strike affects all our shipments, in Italy and abroad: Poste Italiane is currently not collecting parcels, while BRT and DHL are collecting as usual but deliveries may be delayed in some areas.
- Italy we ship with BRT and DHL · possible delivery delays
- European Union for now we ship with DHL only · possible delays
- Non-EU countries (customs) shipments temporarily suspended: they will leave as soon as Poste Italiane resumes collections
We apologise for any inconvenience and thank you for your patience.
Suggest your price, we'll reply within 24 working hours
The Kappa K638 is the passenger backrest made of foam rubber covered with fabric that the Kappa catalog lists as an optional for three Monolock® top cases: K466 Urban (46 liters), K400 (40 liters), and K355 (35 liters). It attaches to the top case lid and provides back support for the passenger. It is sold separately: the top case is not included.
✓ Strengths
- Foam rubber covered with fabric – it is the only Kappa backrest that is padded and covered, not molded polyurethane
- Three top cases with a single code – K466 Urban, K400, and K355, all Monolock®
- Uniform black – matches the lid without clashing
- Back support – the passenger no longer has to hold on with just their arms
- Original Kappa Moto (Givi S.p.A.), not aftermarket
Technical features
| Brand | Kappa Moto (Givi S.p.A.) |
| Kappa Code | K638 |
| EAN | 8029871125218 |
| Type | Passenger backrest for top case |
| Top cases | K466 Urban · K400 · K355 |
| System | Monolock® |
| Color | Black |
| Material | Foam rubber, fabric covered |
| Origin | Italy |
| Contents | 1 backrest (top case not included) |
| Condition | New |
Top cases it fits on
| Top Case | Codes | Capacity | System |
|---|---|---|---|
| Kappa K466 Urban | K466N2 · K466NT2 | 46 liters | Monolock® |
| Kappa K400 | K400N2 · K400NT2 | 40 liters | Monolock® |
| Kappa K355 | K355N2 · K355NT2 | 35 liters | Monolock® |
The name, material, and top case compatibility are transcribed from the official Kappa Moto accessories catalog, where the K638 "Foam rubber backrest, covered with fabric" is listed as an optional for these three top cases.
⚠️ Important notes:
• Each Kappa top case has its own backrest. The catalog assigns K627 to the K35 Action, K633 to the K47 Manta, K642 to the K45N and K320N Cube, K645 to the K'Metrobox, K131 to the K4900 K'Vanguard. If your top case is not among the three in the table, please write to us before ordering and we will tell you the correct code.
• The top case is not included: only the backrest is provided here.
• We do not publish the measurements because Kappa does not provide them for this code. If you need the exact dimensions, please write to us: we will measure it on the actual item.
• Each Kappa top case has its own backrest. The catalog assigns K627 to the K35 Action, K633 to the K47 Manta, K642 to the K45N and K320N Cube, K645 to the K'Metrobox, K131 to the K4900 K'Vanguard. If your top case is not among the three in the table, please write to us before ordering and we will tell you the correct code.
• The top case is not included: only the backrest is provided here.
• We do not publish the measurements because Kappa does not provide them for this code. If you need the exact dimensions, please write to us: we will measure it on the actual item.
Who it's perfect for
For those who own a K466 Urban, K400, or K355 and often carry a passenger. Among Kappa backrests, this is the only one that is padded and fabric-covered instead of molded polyurethane: you can feel the difference against your back, especially on long journeys. It's also the part you look for when the old one is worn out but the top case is still perfect.
🛡️ Warranty and quality – Moon Bike S.r.l.
Original accessory from Kappa Moto (Givi S.p.A.), new and packaged. 24-month legal guarantee of conformity. Moon Bike S.r.l. is an authorized dealer based in Cercola (NA): tracked shipping and invoice included. If you have any doubts about your top case, please write to us before ordering.
Original accessory from Kappa Moto (Givi S.p.A.), new and packaged. 24-month legal guarantee of conformity. Moon Bike S.r.l. is an authorized dealer based in Cercola (NA): tracked shipping and invoice included. If you have any doubts about your top case, please write to us before ordering.
Frequently Asked Questions (FAQ)
❓ Which top cases does the K638 fit?
On three Monolock® top cases: the 46-liter K466 Urban (K466N2 and K466NT2), the 40-liter K400 (K400N2 and K400NT2), and the 35-liter K355 (K355N2 and K355NT2). The Kappa catalog lists it as an optional for each of these three.
❓ Is the top case included in the price?
No. The K638 is the backrest only. The top case is purchased separately.
❓ What material is it made of?
Foam rubber covered with black fabric. This is how the Kappa catalog describes this code, and it's what distinguishes it from other Kappa backrests, which are molded polyurethane.
❓ Is it suitable for another Kappa top case?
Kappa provides a different backrest for each top case: the K627 for the K35 Action, the K633 for the K47 Manta, the K642 for the K45N and K320N Cube, the K645 for the K'Metrobox, the K131 for the K4900 K'Vanguard. If yours is not among the three in the table, write to us and we will tell you the correct code.
❓ Is it original Kappa or a compatible replacement?
It is an original Kappa Moto accessory, a brand of Givi S.p.A. It is not an aftermarket product.
❓ How much does it weigh?
Approximately 0.4 kg. It ships in a soft package with dedicated packaging, tracked shipping, and invoice included.
Frequently asked questions
Shipping times +
Shipping within 24-48 working hours in Italy. Tracking via SMS/email. Free pickup at our store in Cercola (NA), ready within 1 hour.
Returns and refunds +
You have 14 days from delivery to return the item without giving a reason. Free returns for faulty items. Full details
Payment methods +
Credit cards (Visa, Mastercard, American Express), PayPal, Apple Pay, Google Pay, Shop Pay, Klarna (pay in 3) and cash on delivery.
Warranty and authenticity +
All products come with a 24-month legal warranty. We are an Official Piaggio Group Dealer: original spare parts are certified with a verifiable OEM code.
Technical support +
Our technical team is available on WhatsApp +39 392 456 1248 Mon-Fri 9:00–13:30 / 14:30–18:00 (Italian time), or by email.