Looking for help installing your new UPPAbaby Knox?

On this page, we've compiled videos and graphics to show you how to install and use the UPPAbaby Knox. Please reference your UPPAbaby Knox product manual for more detailed information.

If you have questions about your Strolleria order, please contact us.

UPPAbaby offers numerous channels for customer support, including virtual car seat checks by appointment. By downloading the UPPAbaby app, you can also engage in a video chat with an UPPAbaby representative who can help you with installing your Knox.

How to Use UPPAbaby Knox Fit Inlay

The UPPAbaby Knox insert or fit inlay is recommended for children weighing 14 to 25 pounds.

The insert helps the harness fit properly on a smaller child and improves the recline angle. It can be removed when your child reaches 25 pounds OR when the child has begun growing on top of the buckle, making it difficult to use the buckle. 

How to Install UPPAbaby Knox with Seatbelt (Rear-Facing)

The Knox can be installed using your vehicle seatbelt or the Latch system. Seatbelt installation is recommended, as the combined weight of the seat and child will exceed the Latch limits once your child reaches 30 pounds—requiring a switch to the seatbelt.

See the video below for a look at installing the UPPAbaby Knox rear-facing with a seatbelt.

Follow these step-by-step directions (outlined in more detail in your product manual) to install the Knox rear-facing.

1. Prepare the Knox for rear-facing installation.

Place the Knox on your vehicle seat, ensuring the base of the seat and the leg area of the seat are making full contact with your vehicle seat. (See images #1 and #3 in the graphic below.)

Use the lever on the back of the seat (image #2) to adjust the recline of the Knox.

Loosen the harness and raise the headrest to create space, then unzip the seat fabric from the bottom of the seat to reveal the blue belt tensioning plate.

2. Thread and buckle the seatbelt. 

Thread the lap and shoulder belt through the bottom of the seat, buckling on the other side.

3. Route the lap belt under the plate.

Ensuring that the belt is not twisting, route the lap belt (NOT the shoulder belt) under the blue tensioning plate. 

4. Tighten and secure the shoulder belt.

Pull the shoulder belt with one hand while using your other hand to push on the bottom of the seat until the SmartSecure indicator window turns from red to green. (See image #3 below.)

Take an overhead view to examine the SmartSecure indicator, as the indicator may incorrectly appear red if viewing from the side.

While holding the shoulder belt tight, route the belt under the tensioning clip farthest from the seatbelt buckle (see image #4). Be sure to push the belt to the back of the clip.

5. Lock the vehicle seatbelt.

Lock the seatbelt by pulling on the belt until it is fully extended, then feeding the belt into the retractor to remove any slack. See your vehicle manual for help locking the seatbelt.

6. Install the tether strap.

The rear-facing tether is optional but recommended, as it inhibits movement and rotation of the seat in a collision. 

Remove the tether from storage, guiding it around the inboard side of the seat and around the headrest. If your headrests have posts, route the tether between the posts (as in image #2). Secure the tether to the approved Latch locations outlined in your vehicle manual.

 

Pull up on the tether to tighten it, and secure excess webbing by rolling it around the fabric sleeve (see images #4 and #5 below.)

 

7. Check to ensure your seat is installed securely.

Perform these checks to ensure your car seat is installed securely.

• Check to ensure that the tightness indicator window is completely green, not red.
• Check the tightness of the seat by moving it near the belt path, not the top of the seat. The seat should not move more than 1 inch side-to-side or front-to-back. Some movement, within one inch, is expected.
• Check to make sure the lap belt is routed under the plate and that the shoulder belt is secured under the tensioning clip.
• Check to ensure the vehicle seatbelt retractor is locked.
• Check the recline indicator on the side of the seat to ensure that the bead is within the blue area for rear-facing installations.

How to Install UPPAbaby Knox with Latch (Rear-Facing)

See the video below for an overview of installing the Knox rear-facing with Latch. Note that Latch cannot safely be used after your child reaches 30 pounds.

Follow these step-by-step directions for installing the Knox with Latch (and see your product manual for additional graphics and details).

1. Prepare the seat for installation with Latch.

Prepare the seat for installation by raising the headrest and unzipping the seat fabric. Open the panel at the front of the seat to access the lower anchor connectors and belt.

Place the Knox on your vehicle seat, ensuring the base of the seat and the leg area of the seat are making full contact with your vehicle seat. Use the lever on the back of the seat to adjust the recline of the Knox.

2. Thread and buckle the Latch connectors.

Route the Latch connectors through each side of the seat, using the rear-facing belt path identified in blue. Press the adjuster to lengthen the Latch belt if needed.

Clip the connectors to the lower anchors in the crease of your vehicle seat, listening for a click.

3. Route the Latch belt under the tensioning plate and remove slack.

Ensuring that the Latch belt is not twisted, route the belt underneath the blue tensioning plate.

Tighten the belt by pulling it near the anchor, while using your other hand to push down on the bottom of the seat.

As pressure is applied, the tightness indicator turns from red to green. See image #5.

4. Install the tether and perform a safety check.

See the section above for instructions on installing the tether strap and checking your seat to ensure it has been installed correctly.

How to Install UPPAbaby Knox with Seatbelt (Forward-Facing)

The UPPAbaby Knox can be installed forward-facing for children from 25 to 65 pounds and up to 49" in height. The Knox can be used rear-facing up to 45 pounds, and UPPAbaby recommends using the Knox in the safest, rear-facing position as long as possible.

Note that UPPAbaby recommends installing the Knox using the vehicle seatbelt as outlined below. While Latch can be used for forward-facing installation, it is no longer safe once your child is over 35 pounds.

See the video below for a look at installing the Knox forward-facing with a seatbelt.

See below for a step-by-step look on installing the Knox forward-facing, and see your product manual for additional information and graphics.

1. Prepare the seat for installation.

Place the Knox on your vehicle seat, ensuring the base and the back of the seat are in full contact with the vehicle seat.

Recline the seat to your desired position, loosen the harness and raise the headrest to allow access to the forward-facing belt tensioning plate, marked in red. Unzip the seat fabric.

Unclip the tether from storage and place on front side of the car seat prior to installation.

2. Thread and buckle the seatbelt. 

Thread the lap and shoulder belt through the sides of the seat, buckling on the other side.

3. Route the lap belt under the plate.

Ensuring that the belt is not twisting, route the lap belt (NOT the shoulder belt) behind the red tensioning plate. 

4. Tighten and secure the shoulder belt.

Pull the shoulder belt with one hand while using your other hand to push on the bottom of the seat until the SmartSecure indicator window turns from red to green. (See image #3 below.)

While holding the shoulder belt tight, route the belt under the tensioning clip farthest from the seatbelt buckle (see image #4). Be sure to push the belt to the back of the clip.

Lock the vehicle belt by pulling it all the way out, then feeding it back into the retractor to remove any slack. Check your vehicle manual for instructions on locking your seatbelt.

5. Install the tether.

Using the tether is strongly recommended, as it inhibits the forward movement of the car seat in a crash.

Route the tether either through the posts of your headrest (see image #1), or to the inboard side of the headrest if your headrest is integrated into the seat.

Hook the tether to an approved Latch location (as seen in image #2); see your vehicle manual for details. Pull up on the strap until it is taut (image #3), then roll the excess webbing around the fabric sleeve and secure it with the provided closure (image #4).

6. Check to ensure your seat is installed securely.

Perform these checks to ensure your car seat is installed securely.

• The tightness indicator window is completely green, not red.
• Check the tightness of the seat by moving it near the belt path, not the top of the seat. The seat should not move more than 1 inch side-to-side or front-to-back.
• Check to make sure the lap belt is routed under the plate and that the shoulder belt is secured under the tensioning clip.
• Check to ensure the vehicle seatbelt retractor is locked.
• Check the recline indicator on the side of the seat to ensure that the bead is within the red area for forward-facing installations.

How to Remove and Wash UPPAbaby Knox Fabrics

Fabrics can be machine-washed in cold water, using a mild detergent and gentle cycle. Lay flat to dry, away from direct sunlight.

To clean the harness webbing, spot clean using warm water and a mild detergent, then air dry completely before use. Plastic components can also be spot-cleaned and toweled to try.

Take a look at removing the Knox seat fabrics in the video below.