Quick Summary
The Witter ZX304 is a clamp-on towbar mounted bike rack for 4 bikes with a stated maximum load of 60 kg. It includes a lightboard for 13-pin sockets and is designed to attach to 50 mm towballs. The rack also tilts when loaded, which gives access to the boot without removing the bikes.
It is a useful option if you need a rear-mounted carrier with individual support arms, adjustable wheel holders and a cycle retaining strap. The stated limit of 15 kg per bike means it is important to check the weight of each bicycle as well as the total load.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Product type | Clamp-on towbar mounted bike rack for 4 bikes. |
| Brand | Witter. |
| Model | ZX304. |
| Maximum load | 60 kg total, so the combined weight of all bikes must stay within this limit. |
| Maximum weight per bike | 15 kg per bike, which is important when checking individual bicycle weights. |
| Towball fit | Attachable to 50 mm towballs. |
| Lighting connection | Lightboard supplied for 13-pin sockets. |
| Wheel and support details | Four support arms, a cycle retaining strap, adjustable wheel holders, max tyre width 8 cm, max distance between bike wheels 120 cm and distance between rails 17 cm. |
What to Compare Before Buying
- Load capacity: The rack is rated to 60 kg in total, so compare that with the combined weight of the bikes you plan to carry.
- Bike weight: The stated maximum is 15 kg per bike, which matters if you plan to carry heavier adult bikes.
- Towbar fit: This model attaches to 50 mm towballs, so check your vehicle’s towball size before choosing it.
- Lighting connection: The included lightboard is for 13-pin sockets, so a different connection setup may need an adaptor or another option.
- Wheel and frame spacing: Compare tyre width, wheel spacing and rail spacing with your bicycles to make sure they sit correctly on the carrier.
Compatibility, Size and Fit
The ZX304 is made for 50 mm towballs and comes with a lightboard for 13-pin sockets. It is also stated to suit children’s bikes through the adjustable wheel holders. Check the bicycle weights, tyre width, wheel spacing and the intended vehicle fit before deciding.
It is not suitable for motorhomes, and it is noted as not applicable for van vehicles.
What Is Included
- 1 x Witter ZX304 bike carrier.
- Rear light board.
- 13-pin plug.
- Securing strap.
What Else You May Need
If your vehicle uses a 7-pin socket, a separate adaptor is needed. If you want to secure the bikes further, lockable handles are mentioned as an extra accessory.
Important Limitations
The maximum load is 60 kg and the maximum weight per bike is 15 kg. The carrier is not suitable for motorhomes and is not applicable for van vehicles. The 13-pin lightboard connection uses 8 of the 13 pins, with 5 left free.
Before You Decide
Check that your towball is 50 mm, your bikes stay within the 60 kg total load and 15 kg per-bike limit, and your lighting setup matches the supplied 13-pin lightboard. Also confirm that your vehicle is not a motorhome or van before choosing this rack.
