Price on request
Nitrum
Rigid-frame active / ultralight. Highly configurable aluminium rigid chair with an oval-tube frame aimed at maximum push efficiency.
RGK (Sunrise Medical)
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RGK (Sunrise Medical) · Rigid-frame active / ultralight · MW-005
RGK Octane Sub4 titanium rigid wheelchair
The RGK Octane Sub4 is a made-to-measure rigid wheelchair in Grade 9 titanium. RGK guarantees a weight below 4 kg (8.8 lb), not counting wheels and cushion. More than 30 body measurements go into each frame, seat width and depth are set in 5 mm steps, and carbon fibre is used for parts such as the sideguards and footplate.
- Max user weight
- 120 kg
- Seat widths
- 250 to 440 mm, 5 mm steps
- Seat depths
- 250 to 440 mm, 5 mm steps
- Frame
- Grade 9 titanium, rigid, made to measure
RGK Octane Sub4 key features
- Grade 9 titanium frame with titanium fasteners
- Guaranteed under 4 kg excluding wheels and cushion
- Seat width and depth from 250 to 440 mm in 5 mm steps
- Carbon fibre sideguards and footplate
- Mesh seat upholstery with titanium buckles
- Back angle adjustable 10 degrees either side of 90
Who the RGK Octane Sub4 suits
Best for experienced active users who already know their ideal set-up and want a fully bespoke, very light chair. It is not transit compatible, so it suits people who transfer to a car seat when travelling.
Figures for comparing
- Max user weight
- 120 kg (265 lb)
The same units on every product, converted from the specifications below. Where a source gives two limits, the lower one is shown.
RGK Octane Sub4 specifications
| Chair weight | Under 4 kg (8.8 lb) excluding wheels and cushion |
|---|---|
| Max user weight | 120 kg |
| Seat widths | 250 to 440 mm, 5 mm steps |
| Seat depths | 250 to 440 mm, 5 mm steps |
| Frame | Grade 9 titanium, rigid, made to measure |
| Front seat height | 380 to 520 mm |
| Rear seat height | 360 to 550 mm |
| Back height | 203 to 431 mm |
| Camber | 1 to 3 degrees |
| Centre of gravity | 0 to 178 mm |
| Transit compatible | No |
| Maker country | United Kingdom |
| Brand | RGK (Sunrise Medical) |
| Category | Everyday manual wheelchairs, Rigid-frame active / ultralight |
| Catalog ID | MW-005 |
Compared with the source page on 5 October 2026. Details can change, so we confirm them in your quote. Open the source page.
RGK Octane Sub4: common questions
Does the RGK Octane Sub4 really weigh under 4 kg?
RGK guarantees less than 4 kg (8.8 lb) for the chair without wheels and cushion. The weight of the complete chair depends on the wheels and cushion chosen.
What is the user weight limit of the Octane Sub4?
The Octane Sub4 is rated for users up to 120 kg.
Can I use the Octane Sub4 as a seat in a vehicle?
No. The maker lists the Octane Sub4 as not transit compatible.
How to get a quote for the RGK Octane Sub4
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You receive availability, a price and delivery options by email, and decide after that.
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Parts listed for RGK chairs
All partsTheir source pages name this model or this brand. We confirm the fit for your chair before quoting.
Pre-order at source
GBP 96.93 ex tax per fork (EPC Wheelchairs); no USD price shown
61mm Anti Tip Fork Assembly
Caster forks. A sports anti-tip caster fork assembly for 61 mm caster wheels on RGK Elite and Grand Slam chairs.
£10.85 ex tax (EPC Wheelchairs, UK)
Calf Strap
Heel loops and straps. Fifty-millimetre calf strap for RGK wheelchairs in six lengths from 24 to 38 inches.
Guides for this kind of product
Gear · 7 min read
How to choose your first active wheelchair
Your first active chair comes down to three things: frame type, five measurements, and the people who help you get them right.
How-to & Maintenance · 8 min read
How to measure yourself for a wheelchair
A few body measurements, a firm tape and a helper are enough to prepare for a wheelchair order. Here is how to take each one and what it becomes.
Gear · 7 min read
Rigid vs folding frame
Rigid frames win on weight and push efficiency. Folding frames win on packing size. The gap is smaller than it used to be, so check real figures.