Bike Racks for Vehicles
- Ev's
- 4WDs
- Passenger vehicles
- Trayback Utes
- Expedition Trucks
- Campervan
- Motorhomes
Bike Racks for Caravans
- Caravans
- Hybrid Caravans
- Expander Caravans
- Camper Trailers
- Box Trailers
Parts & Accessories
Wheel Cradle Reducers for 16–24″ Bikes
$64.00
- Fits 16″–24″ wheels (up to 3.1″ wide)
- Mounts to standard 26″–29″ iSi wheel support cradles
- Innovative claw retention system ensures secure mounting without straps or zip-ties
- Easily removable when bikes reach 26″ wheels or above
Click here to check compatibility with Wheel Cradle Design
Please Note: One reducer required per wheel cradle (product sold in pairs)
Lifetime Warranty
Warranty is lifetime, no questions asked. If something breaks, we replace it. Fellow adventurers rely on our products in the harshest, most remote conditions on the planet.
Australian Made and Owned
iSi are proudly 100% Australian made and owned, designing and manufacturing every iSi carrier right here in Australia. We use the highest quality Australian steels and materials, built to withstand the toughest conditions on the planet. No shortcuts, no compromises—just world-class engineering for true adventure.
Hassle-Free 30-Day Returns
Changed your mind? We offer a 30-day return policy. Ensure the item is in its original packaging and re-saleable condition (a 5% restocking fee applies). For full details, please visit our Shipping, Returns, and Refund Policy page.
Wheel Cradle Reducers – Grows with Your Family
Designed to adapt standard iSi 26″–29″ wheel support cradles for smaller bikes, the Wheel Cradle Reducers allow you to securely carry kids’ bikes with 16″ to 24″ wheels and up to 3.1″ wide tyres. Once the kids bikes grow to full-size wheels, simply unbolt and remove the reducers in seconds.
Bolt-On, Adjustable, No Fuss
These 100% bolt-on accessories feature multiple mounting positions to precisely fit different wheel sizes. No straps, zip-ties, or fiddly adjustments—just a secure, engineered fit every time.
Lightweight, Strong and Corrosion-Resistant
Constructed from textured powder-coated and deburred aluminium with zinc-plated steel hardware, the reducers weigh under 150 grams each—significantly lighter than mild steel alternatives. Wherever possible, iSi uses aluminium to reduce unnecessary weight without compromising strength or durability. The result is a lightweight yet incredibly robust solution that holds up to the demands of remote touring and tough conditions.
iSi Claw Retention System
Our innovative three-point claw system locks each reducer firmly in place without relying on straps or zip-ties, which often degrade under UV exposure and are prone to movement under load.
| Specifications | Two Bicycle Carrier | Four Bicycle Carrier | Drawbar Mount Systems | Vehicle Mount Systems |
|---|---|---|---|---|
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| Weight | 14.15kg | 25.75kg | 9.80kg – 21.20kg | 4.80kg – 6.30kg |
| Bicycle Capacity | 1- 2 Bicycles | 1 – 4 Bicycles | – | – |
| Weight Capacity |
64kg Total Load Up to 32kg per bicycle Up to 16kg per wheel |
84kg Total Load Up to 32kg per bicycle Up to 16kg per wheel |
– | – |
| iSi Modular Component | Drawbar Mount Compatible ☑
Vehicle Mount Compatible ☑ |
Drawbar Mount Compatible ☑
Vehicle Mount Compatible ☑ |
Two and Four Bicycle Carrier Compatible ☑ | Two and Four Bicycle Carrier Compatible ☑ |
| Pivot Function | ☑ | ☑ | Pivot Up & Over | Pivot down to the ground |
| No Straps or Tie Downs | ☑ | ☑ | ☑ | ☑ |
| Light Board Compatible | ☑ | ☑ | ☑ | ☑ |
| Carbon Safe | ☑ | ☑ | ☑ | ☑ |
| Rating | On–Road + Off–Road | On–Road + Off–Road | On–Road + Off–Road | On–Road + Off–Road |
| Materials | 100% Australian Made with 100% Australian steels | 100% Australian Made with 100% Australian steels | 100% Australian Made with 100% Australian steels | 100% Australian Made with 100% Australian steels |
| Warranty | Lifetime Warranty | Lifetime Warranty | Lifetime Warranty | Lifetime Warranty |
| Buyback Program | ☑ | ☑ | ☑ | ☑ |
Frame Support Cradles
iSi Frame Support Cradles are designed to keep the bicycle upright while all transport loads are handled through the Four Point Wheel Cradles. Manufactured from solid steel rod, they resist high-frequency vibrations over corrugated roads. A proprietary rubber compound developed in house features a wide, soft, and UV-resistant rubber. The result is unmatched protection for even the most delicate carbon, titanium, or thin-wall alloy frames.
Main Beam
The main beam is the structural backbone of the iSi carrier and is available in both 25° and 40° departure angle configurations at various lengths. With bikes staggered vertically along the beam, this stadium-style layout reduces the rack’s overall length by managing hub-to-hub clearance. This results in the most compact rack profile on the market, minimising rear overhang on the vehicle.
The staggered positioning also provides a clear working field for loading and unloading bikes with no overlapping handlebars or awkward reach-arounds. Designed for 2- or 4-bike configurations, the main beam connects tool-free to the pivot base and can be quickly swapped to a trailer or removed as needed. It’s a rigid, modular foundation that delivers both performance and practicality for serious adventure travel.
Tow Bar Pivot Base Mounts
The iSi Pivot Base is a robust modular hitch mount that comes standard with a high-tensile anti-rattle hitch stabiliser and an integrated auxiliary license plate holder (or optional lightboard). It’s offered in multiple height and length configurations for the best compatibility for different towbar depths and clearances for drop-down tailgates or rear swing out doors. Moreover, the modular mounts provide ample departure clearance so your bikes or rack avoid ground strikes. The design also features adjustable mounting positions (with multiple hitch pin holes) for fine-tuning the rack’s position relative to your vehicle, yielding a perfect fit tight to the vehicle while providing and secure wobble-free performance.
Adjustable Quad Contact Wheel Cradles
Each bike is stabilised and secured via our Quad Contact Wheel Cradle system with no clamps, bungees, or tie-downs required. The mandrel bent hoops support the tyre at four points on the tread, locking the bike in position through the wheels. This eliminates any unwanted bike movement or rolling left and right as you travel especially over corrugations or off-road tracks. Each cradle is mounted on a sliding offset sleeve, allowing independent height adjustment to finely control handlebar and saddle clearance. Bikes sit tighter and more securely with a narrower footprint, creating a compact, stable load without compromising ease of loading.
