Estimated reading time: 10 minutes
Table of Contents
- How to Measure Your Foot for Motorcycle Boots
- Motorcycle Boot Size Chart — EU to AU/NZ Conversion
- Do Motorcycle Boots Run Small?
- Motorcycle Boot Sizing Tips for Aus & NZ Riders
- Sizing for Wide Feet
- How Closure Type Affects Fit
- Castiron Ride Model Sizing Comparison
- IronRider — Sizing & Fit
- ShiftCast — Sizing & Fit
- FAQ
- External Resources
How to Measure Your Foot for Motorcycle Boots
- Trace your foot on paper — stand on a sheet of paper and trace around your foot. Measure the distance from heel to the tip of your longest toe in centimetres.
- Measure foot width — measure across the widest point of the ball of your foot. This determines whether you need a standard or wide last.
- Measure at end of day — feet swell throughout the day. Always measure in the evening for the most accurate sizing, and wear the socks you’ll actually ride in.
Motorcycle Boot Size Chart — EU to AU/NZ Conversion
Most motorcycle boots — including Castiron Ride — are sized in EU. Australian and New Zealand shoe sizes follow the US sizing system for men and UK sizing for women. Use this chart to find your equivalent. If you fall between sizes, size up.
| EU Size | AU/NZ Men | AU/NZ Women | UK Size | Foot Length (cm) |
|---|---|---|---|---|
| 38 | 6 | 7.5 | 5 | 24.0 |
| 39 | 7 | 8.5 | 6 | 24.7 |
| 40 | 7.5 | 9 | 6.5 | 25.3 |
| 41 | 8 | 9.5 | 7 | 26.0 |
| 42 | 9 | 10.5 | 8 | 26.7 |
| 43 | 10 | 11.5 | 9 | 27.3 |
| 44 | 10.5 | 12 | 9.5 | 28.0 |
| 45 | 11.5 | 13 | 10.5 | 28.7 |
| 46 | 12 | 13.5 | 11 | 29.3 |
| 47 | 13 | 14 | 12 | 30.0 |
| 48 | 14 | 15 | 13 | 30.7 |
Do Motorcycle Boots Run Small?
| Boot Type | Typical Fit | Sizing Recommendation |
|---|---|---|
| Touring boots (IronRider) | True to size, roomy last | Size true — BOA adjusts for fine-tuning |
| Performance boots (ShiftCast) | True to size, roomy last | Size true — BOA adjusts for fine-tuning |
| Lifestyle shoes (RoadCast) | True to size, standard last | Size true — size up if wide feet |
| Street shoes (StreetCast) | True to size, standard last | Size true — size up if wide feet |
| Any boot with thick armour | Can feel snug initially | Allow break-in period of 2–4 rides |
Motorcycle Boot Sizing Tips for Aus & NZ Riders
- Always measure both feet — most people have one foot slightly larger. Size to the larger foot.
- Measure at end of day — feet swell throughout the day. Evening measurements give the most accurate size.
- Wear your riding socks — thick socks add 0.5–1 size of volume. Always size with the socks you’ll actually ride in.
- Check heel hold first — the heel should sit firmly with no lift. If the heel lifts, size down. If the toe box is tight, size up.
- Allow for break-in — leather motorcycle boots typically need 2–4 rides to fully break in. Some initial snugness is normal.
- BOA closure = more flexibility — BOA dial allows micro-adjustment after sizing, giving more tolerance than lace or buckle closures.
Sizing for Wide Feet
| Situation | Recommendation | Best Castiron Ride Model |
|---|---|---|
| Wide feet, standard length | Size true, choose roomy last + BOA | IronRider or ShiftCast |
| Wide feet, between sizes | Size up half a size | IronRider or ShiftCast |
| Wide feet + thick socks | Size up half to full size | IronRider |
| Average width feet | Size true to EU chart | Any Castiron Ride model |
How Closure Type Affects Fit
| Closure Type | Fit Adjustability | Best For | Castiron Ride Models |
|---|---|---|---|
| BOA Dial | Micro-adjustable — highest flexibility | Wide feet, precise fit, all-day riding | IronRider, ShiftCast |
| Lace-up | Adjustable but fixed once tied | Standard width, traditional fit | MileCast |
| Velcro / Zip | Low adjustability | Quick on/off, standard width | RoadCast, StreetCast |
Castiron Ride Model Sizing Comparison
| Model | Last Width | Closure | Sizing | CE Rating |
|---|---|---|---|---|
| IronRider | Roomy / Wide | BOA Dial | True to size | CE Level 1 · 1 1 1 1 |
| ShiftCast | Roomy / Wide | BOA Dial | True to size | CE Level 1 · 1 1 1 1 |
| RoadCast | Standard | Velcro | True to size | CE Level 1 · 1 1 1 1 |
| StreetCast | Standard | Lace-up | True to size | CE Level 1 · 1 1 1 1 |
IronRider — Sizing & Fit
IronRider
The IronRider is built on a roomy last and sizes true to EU. The BOA dial closure allows micro-adjustment after sizing, making it the most forgiving fit in the Castiron Ride lineup for Aus and NZ riders between sizes or with wide feet. CE Level 1 certified to EN 13634:2017. Ships to Australia and New Zealand with free delivery over AU$150.
- Last: Roomy / Wide
- Closure: BOA Dial
- Sizing: True to EU size — size up half if wide feet + thick socks
- Break-in: Minimal — BOA adjusts from day one
ShiftCast — Sizing & Fit
ShiftCast
The ShiftCast shares the same roomy last as the IronRider and sizes true to EU. BOA dial closure provides the same micro-adjustment flexibility. Slightly lower profile than the IronRider but identical sizing behaviour. CE Level 1 certified to EN 13634:2017. Ships to Australia and New Zealand.
- Last: Roomy / Wide
- Closure: BOA Dial
- Sizing: True to EU size — size up half if wide feet + thick socks
- Break-in: Minimal — BOA adjusts from day one
Shop Castiron Ride — Australia & New Zealand
FAQ
Do motorcycle boots run small in Australia?
Most motorcycle boots, including Castiron Ride, run true to your regular EU shoe size. Use the EU-to-AU/NZ conversion chart above. If you’re between sizes or have wide feet, size up half a size.
Is there an Australian standard for motorcycle boot sizing?
Australian and New Zealand shoe sizes follow the US sizing system for men. No specific AS or NZS standard exists for motorcycle footwear protection — EN 13634:2017 CE certification is the benchmark for Aus and NZ riders.
Should I size up in motorcycle boots for Australian riding?
Size up half a size if you have wide feet, plan to wear thick riding socks, or fall between EU sizes. Size true if you have average-width feet. BOA dial closure on the IronRider and ShiftCast allows fine-tuning after sizing.
Do motorcycle boots stretch with wear in Aus & NZ conditions?
Leather motorcycle boots will stretch slightly during break-in — typically 2–4 rides. Textile boots stretch less. If a boot feels uncomfortably tight from day one, size up rather than relying on stretch.
What size motorcycle boots for wide feet in Australia?
Choose a boot built on a roomy last (IronRider or ShiftCast) and size true to EU. If between sizes or wearing thick socks, size up half a size. See our full motorcycle boots for wide feet Aus & NZ guide.
External Resources
- Motorcycle Advisory Council of Australia (MACA)
- NZ Transport Agency Waka Kotahi — Motorcycle Safety
- Ride On Magazine — Australian Motorcycle Gear Reviews
- Motorcycling Australia
- BikeMe — Australian Motorcycle News & Reviews
More Castiron Ride guides for Australia & New Zealand:
- How to Choose Motorcycle Boots 2026 — Australia & New Zealand
- Best Waterproof Motorcycle Boots 2026 — Australia & New Zealand
- Motorcycle Boots for Wide Feet 2026 — Australia & New Zealand
- CE Level 1 vs CE Level 2 Motorcycle Boot Protection Explained 2026 — Australia & New Zealand
- Best Motorcycle Boots 2026 — Castiron Ride ShiftCast Review | Australia & New Zealand
Written by T-K