Kappa K638 Foam Passenger Backrest – K466 Urban, K400 and K355 Top Cases

The Kappa K638 is the fabric-covered foam passenger backrest listed in the Kappa 2026 catalog as an optional accessory for three MONOLOCK® top cases: the 46-liter K466 Urban, the 40-liter K400, and the 35-liter K355. It mounts on the top case and provides the passenger with back support. It is sold separately: the top case is not included.

✓ Key Features

• One code for three top cases: K466 Urban, K400, and K355, all MONOLOCK®
• Fabric-covered foam, as described in the Kappa catalog
• Passenger support, allowing them to travel sitting back rather than holding on
• Kappa code K638, EAN 8029871125218
• Original Kappa Moto accessory, a brand of the GIVI S.p.A. group, made in Italy

Technical Specifications

Compatible top cases

Combination from the official Kappa 2026 catalog. If in doubt, write to us with your top case code.

Who it is perfect for

For anyone with a K466 Urban, K400, or K355 on their motorcycle who often carries someone behind them: with the backrest, the passenger can sit back and rest rather than holding on, even on long journeys. It is also the part to look for when the old one has become damaged.

Frequently asked questions

Which top cases can the K638 be mounted on?
Three Kappa 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 2026 catalog lists it as an optional accessory for each of these top cases. For another model, write to us before ordering.

Is the top case included in the price?
No. The K638 is the passenger backrest only and comes without a top case. The K466 Urban, K400, or K355 must already be mounted on the motorcycle or purchased separately. It is also the right replacement when the original backrest has become damaged or worn out and the top case is still in good condition.

What is it made of?
The Kappa catalog describes it as a fabric-covered foam backrest. The foam padding makes the support soft for the passenger's back, while the black fabric cover matches the top case. It is designed to make both long journeys and everyday trips more comfortable.

Is it also suitable for other Kappa top cases?
Kappa provides a specific backrest for each top case model because the shape of the lid varies from one model to another. The K638 is indicated for the K466 Urban, K400, and K355. If your top case is another model, write to us with the top case code and we will tell you the right backrest.

Is it an original Kappa product?
Yes. It is the original Kappa backrest with the manufacturer code K638 and EAN 8029871125218, new and made in Italy. Kappa Moto is a brand of the GIVI S.p.A. group, which designs top cases, suitcases, and accessories for motorcycles and scooters, including specific backrests for each top case.

How is it shipped?
The backrest is shipped in its packaging, protected by a soft package, with a shipping weight of approximately 0.4 kg. Moon Bike S.r.l. is based in Cercola, in the province of Naples, and ships from Italy with an invoice and a 2-year warranty, so you will also receive the purchase document.