For Vehicles
Tow-Bar Mounted Bike Racks
Modular 1-4 bike racks manufactured in Australia for cars, SUVs, 4WDs and utes.
Wheel Support Cradles
From $50.00
Ships in 3–5 business days
·
Made in Melbourne
The iSi Adjustable Wheel Cradle System offers complete freedom to horizontally and vertically position each bike wheel, ensuring a tight, stable, and strap-free load — even for mixed bike sizes and long wheelbases.
Quad Contact · Adjustable · Strap-Free
Four Points. Zero Movement.
The iSi Wheel Support Cradle is the reason you'll never strap a bike onto an iSi carrier. Four mandrel-bent contact points lock each wheel in position through the tyre tread, preventing roll, bounce and lateral movement even over the roughest corrugated roads. Every cradle offers independent horizontal and vertical adjustment, giving you complete control over bike spacing and clearance.
Quad Contact System
Horizontal + Vertical Adjust
No Straps or Tie-Downs
Lifetime Warranty
How It Works
The Quad Contact Wheel Cradle System
Each cradle uses four mandrel-bent contact points that grip the tyre tread from four directions. The wheel is locked in position mechanically, with no reliance on straps, bungees, or tie-downs that degrade over time.
Four-Point Retention
Locked Through The Tread
The four contact points grip the tyre at its tread, not the rim. This creates a firm, stable hold that prevents the wheel from rolling forward, backward or sideways. The mandrel-bent hoops distribute contact force evenly, so there's no pinch point that could damage the tyre over long trips.
- Four contact points per wheel for zero movement
- Mandrel-bent for even force distribution
- No straps, bungees, clamps or tie-downs required
Horizontal Adjustment
Offset, Centre, Or Anywhere In Between
Each cradle slides along an offset sleeve on the main beam, giving you complete horizontal positioning freedom. You can offset bikes to one side, centre them precisely, or stagger them to eliminate handlebar clashes. This covers wheelbases up to 1,600mm and keeps the load as slim and centred as possible for stable highway and off-road dynamics.
- Full horizontal range: offset, centred, or staggered
- Accommodates wheelbases up to 1,600mm
- Keeps load centred for stable travel dynamics
Which Type Do You Need?
Type A vs Type B
Your iSi carrier uses either Type A or Type B wheel cradles depending on the main beam configuration. To replace a pair of cradles, select a pair of the same Type. This allows for further adjustment to the adjacent cradle.
Type A
The standard cradle orientation. Check your existing cradle or original order documentation to confirm which type you have.
Type B
The mirrored cradle orientation. Used in combination with Type A on some configurations for optimal clearance between adjacent bikes.
3.1"
Regular WidthSuits standard road, gravel, MTB and e-bike tyres up to 3.1" wide
5.5"
FAT WidthSuits fat-tyre bikes with tyres up to 5.5" wide
Engineered For Every Bike
Wheel Cradle Key Features
Every adjustment you need, with none of the accessories you don't.
Vertical Adjustment
Each cradle has a high and low setting. Swap the vertical position to move a handlebar up and over, or just below, an adjacent saddle. Eliminates clearance clashes between bikes.
Mixed Bike Sizes
Road bikes, mountain bikes, e-bikes, fat bikes. The adjustable positioning handles mixed sizes on the same carrier without compromise.
Australian Steel
Manufactured in Melbourne from Australian steels. Mandrel-bent for precise geometry and powder coated for long-term corrosion resistance.
16" to 24" Kids' Bikes?
Pair with our Wheel Cradle Reducers to adapt these cradles for smaller wheels. Removable when the kids grow into full-size bikes.
Lifetime
Warranty
26" to 29"
Wheel Range
Made In
Melbourne
30 Day
Returns
Not sure which type or width you need?
Send us a photo of your existing cradles or your original order number and we'll confirm the correct Type and Width in minutes.
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| 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.
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