📏Chaya Derby Onyx Size Chart

Chaya Derby Onyx quad skates come in single EU sizes. Measure your foot length in cm (Mondo) and match it to the row below. The Plate column is the size of the skate’s derby plate. The US column shows Women’s / Men’s.

How to measure: Place a sheet of paper against a wall on a hard floor. Stand on it with your heel against the wall and mark the tip of your longest toe. Measure the distance in centimetres — that cm value is your size.

Foot (cm)	EU	US (W/M)	UK	Plate
22.9	36	6 / 5	4	3
23.6	37	6.5 / 5.5	4.5	3
24.2	38	7 / 6	5	5
24.8	39	8 / 7	6	5
25.5	40	8.5 / 7.5	6.5	6
26.1	41	9 / 8	7	7
26.8	42	10 / 9	8	8
27.5	43	11 / 10	9	9
28.2	44	— / 10.5	9.5	9
28.9	45	— / 11	10	10
29.6	46	— / 12	11	11

Model Cut

Normal — suitable for all feet. Match your foot length in cm to the EU row above. The US column shows Women’s / Men’s.

Fitting for COMFORT

Size up one for a relaxed fit with a little extra room.

Fitting for PERFORMANCE

Buy your exact size. A snug boot gives better control; it softens and packs out after 6–8 hours.

Boot

Low-cut derby boot built for speed and agility on the track.

Plate

The plate (the chassis the wheels mount to) is sized to the boot — see the Plate column. Replacement plates and tuning follow this size.

Insoles

A thinner insole adds about half a size of space — e.g. a 42 becomes a 42.5.

✓ How it should feel

Wrapping with slight discomfort that softens after 6–8 hours. Toes touching or reaching the end.

✗ How it should NOT feel

Toes curling up, the foot moving around freely, or the heel lifting once laced.

Size Chart Disclaimer. This chart reflects measurements supplied by Chaya. The Derby Onyx ships in single sizes EU 36–46; the Plate column shows the matching plate size. We cannot be held responsible for incorrect size purchases — when in doubt, message us before ordering.

🚚Next Day Delivery

NOT APPLICABLE FOR PRE-ORDERS

How to Get Next Day Delivery with J&T / SPX

• Order Placement Time:

  • To qualify for next day delivery, orders must be placed before 11:00 AM (Monday to Friday).

• Delivery Service Provider:

  • All deliveries are handled by J&T Express or SPX, ensuring fast and reliable service.

• Delivery Timeline:

  • Orders placed before 11:00 AM (Monday to Friday) will be delivered the next working day.

  • Orders placed after 11:00 AM or on weekends (Saturday and Sunday) will be delivered the working day after the next working day.

  • Orders placed on Public Holidays will be delivered the working day after the next working day.

• Working Days:

  • Monday to Friday are considered working days for next day delivery.

  • Saturday, Sunday, and Public Holidays are not eligible for next day delivery and are treated as non-working days.

• Delivery Tracking:

  • Once your order is processed, you will receive a tracking number to follow the status of your delivery.

• Availability:

  • Next day delivery is available only in areas serviced by J&T Express. Please check if your location is covered by their network.

• Important Notes:

  • Orders placed on weekends or public holidays will be processed on the next working day for delivery.

  • Ensure your order is placed before 11:00 AM on working days to ensure timely next day delivery.