woom Off Air 4 Black 2026
The next-generation Woom OFF AIR 4 is an ultralight, durable hardtail mountain bike with serious all-terrain capabilities for kids aged six and up. With high-quality front suspension and powerful disc brakes, it teams maximum comfort with full control for the ultimate performance on XC trails, gravel tracks, tarmacked lanes and beyond.
UK delivery
If your item is in stock and ordered before 12pm, we will do our best to despatch your order the day you place it. In busy times we tell you how long it will take us to process it.
The above does not apply to bikes, which we have to assemble and inspect before repacking for dispatch. Typically we try to have bike orders dispatched within 3-5 days, but in busier times it may take longer. In those cases we'll let you know of longer than expected delivery times.
Please bear in mind that we are closed on Wednesdays, so no items will be dispatched then.
Free postage over £40
For small items we use Royal Mail's 48 service which has a delivery time of typically 2-3 days from dispatch; though you do have the option to upgrade to 24 which is generally next-day from dispatch if you require your order sooner. Please note in some cases the item will need to be signed for, so please provide an address where someone will be in.
Orders over £40 (gbp) qualify for free standard delivery via Royal Mail 48. Please note that helmets are excluded, as they're often ordered in the wrong size/shape/fit. Some larger items aren't suitable for Royal Mail and may need to be sent by courier instead; if so, any additional delivery costs will be clearly shown at checkout.
Bike shipping
When we send out a larger parcel such as a bike or trailer we use a next-day courier - usually either DPD or Parcelforce.
For these reasons please supply us with a delivery address where there will be someone in to sign for your parcel. If there is nobody in when the couriers call, they will leave a card. You can then phone them to arrange delivery for another day or collect your goods from your local depot (a photo ID with proof of address will be required).
How will my bike be delivered?
We fully assemble, safety check and inspect every bike as though you were going to ride it away from our showroom.
However, to get it back into a box suitable for a courier to handle, we have to remove the pedals, handlebar and usually the front wheel - so some minor reassembly is required when the bike is delivered to you.
Please bear in mind that you might need a 15mm spanner for the pedals (adult's bikes generally do not come with pedals included, so you may not need to worry about this), and 4mm, 5mm and 6mm allen/hex keys for the reassembly.
Outside the UK
Since Brexit it is no longer feasible for our website to have permanent shipping prices for international delivery. Instead, if there is an item you are interested in, please Contact Us with a full delivery address and we will quote for delivery.
All the prices on our website and catalogue are in pounds sterling and are inclusive of VAT, but VAT will be removed for international orders. Please bear in mind that you will likely have to pay your country's taxes, import duties and associated courier handling fees for any items.
| Model Year | 2026 |
|---|---|
| Options | Black In stock now |
| Frame | Frame material: lightweight, high-quality 6061 T6 aluminIum with butted and hydroformed tubes. Confidence-inspiring handling: an easy-access low top tube, low centre of gravity and long wheelbase provide good balance and make for a fun, safe ride Hard-wearing plastic chain stay protector prevents scratches |
| Forks | Aluminum air-sprung suspension fork from RST Rebound and compression damping adjustment, plus lockout function 60 mm travel 1 1/8 - " 1 baby taper steerer tube 100 x 15 mm thru-axle Post mount for disc brake |
| Rear Derailleur | 9-speed gearing SRAM X5 rear derailleur |
| Shifters | SRAM X5 trigger shifter |
| Chainset | Lightweight forged aluminIum cranks 110 mm length, narrow Q-factor Narrow-wide chainring with 28 teeth |
| Freewheel/Cassette | Cassette with 11- "32 teeth |
| Headset | Fully integrated 1 1/8 - "1 headset Sealed industrial-grade bearings |
| Stem | Forged aluminIum CNC-machined Handlebars attached via two clamps +/-15° flip-flop design to adjust handlebar height Length: 50 mm |
| Handlebars | Wide, lightweight aluminIum bars with tapered ends Width: 570 mm Rise: 20 mm |
| Front Brake | Hydraulic disc brakes by Promax Disc diameter (front/back): 160/140 mm |
| Rear Brake | Hydraulic disc brakes by Promax Disc diameter (front/back): 160/140 mm |
| Brake Levers | Ergonomic brake levers designed for children's hands |
| Rims | Lightweight, tubeless-ready aluminIum rims from Alex rims. Aluminum hubs with sealed industrial bearings Thru-axles for maximum torsional strength (100 x 15 mm front / 135 x 12 mm rear) 20 spokes, double-crossed spoking Aluminium nipples |
| Tyres | 20 x 2.25 Schwalbe Rocket Ron with ADDIX SPEED rubber compound and Tubeless Easy technology Tubeless-ready Presta valves |
| Saddle | MTB-specific saddle Trail-ready design Ergonomic and age-appropriate design to fit the rider's pelvis Side protection to lean against walls |
| Seatpost | 27.2 x 250 mm Anodised aluminIum seatpost with insertion marks that indicate the minimum insertion depth |
| Pedals | Platform pedals made from fiber-reinforced nylon with metal pins for added grip |
| Grips | Child-friendly thanks to small diameter Ultra comfortable with reinforced contact surface for palms 100% silicone for maximum grip Clamped design to eliminate twisting |
| Seat Clamp | Quick-release aluminIum seat post clamp |
| Wheel Size | 20" |
| Weight | 9.2kg |