Motor: 2.0 HP | Speed: 0.6–11.2 mph | Incline: 12 levels | Deck: 130 × 45 cm | Max User Weight: 110 kg | Folding: Yes | Price: ~£599
The Reebok GT40z is the entry point to the Reebok treadmill range, and it is a proper entry point. Not a walking pad with a brand sticker, not a repackaged Amazon import with a Reebok logo. A real treadmill with a real motor, 12 levels of powered incline, Zwift and Kinomap connectivity, and a warranty that most machines twice the price cannot match.
At around £599, the GT40z sits comfortably below the Jet 200 (£799) and well below the Jet 300 (£949), and the spec sheet reflects that. Smaller deck, lighter motor, fewer incline levels, lower weight capacity. None of that is hidden or spun, you are paying less and getting less. The question is whether what you are getting is enough for what you actually need. For a lot of UK buyers, the answer is a resounding yes.
If your primary use is brisk walking, incline walking, the 12-3-30 workout, light jogging, Couch to 5K, or getting back into fitness after a long break, the GT40z does the job.
If you are running seriously three or more times a week at pace, this is not the one for you. Spend a bit more on the Jet 200 or the Jet 300 and get the deck size and motor power that proper running demands. But if you’re a running beginner, read on.
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Reebok GT40z Specs
| Motor | 2.0 HP |
| Speed Range | 0.6–11.2 mph (1–18 km/h) |
| Incline | 12 levels power incline |
| Running Deck | 130 × 45 cm (51 × 18 inches) |
| Max User Weight | 110 kg (17 st 4 lb) |
| Machine Weight | 61 kg |
| Assembled Dimensions | 168 × 77 × 134 cm |
| Folded Dimensions | 103 × 77 × 146 cm |
| Display | 5″ blue backlit LCD |
| Programs | 43 (manual, 36 preset, 3 user-defined, 3 target) + body fat mode |
| Cushioning | One Series cushioning |
| Connectivity | Bluetooth, Zwift compatible, Kinomap compatible (60-day free trial) |
| Entertainment | Built-in speakers, MP3/aux port, tablet holder, dual water bottle holders |
| Cooling Fan | Yes |
| Folding | Soft-drop hydraulic mechanism with transport wheels |
| Warranty | 10-year frame, 10-year motor, 2-year parts and labour |
Key Features and Benefits
Motor and Speed
The 2.0 HP motor delivers a top speed of 11.2 mph, the same maximum as the Jet 200 one tier up. That is fast enough for brisk walking, jogging, interval training, and moderate-pace running. You are not sprint training on this, but you are not sprint training on any home treadmill under £700 either.
Where the motor starts to show its limits compared to higher-spec machines is sustained high-speed running under load. At top speed with incline engaged, a 2.0 HP motor works harder than a 2.25 or 2.5 HP unit would, which means slightly more noise, slightly more heat, and slightly more wear on the belt over time. For walking and jogging — the GT40z’s natural habitat — none of this is an issue. The motor cruises comfortably through a 4–7 mph session without breaking a sweat.
Quick speed buttons on both the console and the handlebars allow mid-stride adjustments without leaning forward or losing your rhythm. Increments of 3 kmh (check out our treadmill speed conversion chart if kmh to mph conversion leaves you frustrated) on the quick buttons let you jump between walking and jogging pace in a single press.
Incline
The 12 levels of powered incline at this price is a genuine selling point. Plenty of treadmills under £600 have no incline at all, and plenty more offer only a manual 2- or 3-position lever that requires you to stop the machine, get off, and physically adjust it. The GT40z does it electronically, mid-stride, with quick-adjust buttons.
That incline range makes the GT40z a natural fit for the 12-3-30 workout (12% incline, 3 mph, 30 minutes) which has become one of the most popular treadmill routines in the UK. You can hit the required 12% gradient and lock in at walking pace without needing a more expensive machine.
For hill training and interval work, the 12 levels also offer enough variety to build structured sessions. The built-in programs use incline changes automatically, creating undulating workouts that keep things interesting across a 30- or 45-minute session. Transitions between levels are smooth and gradual rather than abrupt.
Three fewer levels than the Jet 200 and Jet 300 (both have 15 levels). In practice, the difference is minimal for most users — the missing top-end levels primarily affect steep-gradient training, which is more relevant for advanced runners who should probably be on a bigger machine anyway.
Running Deck
At 130 × 45 cm, this is the smallest running deck in the current Reebok range. That is the honest assessment and the single biggest trade-off for the lower price. The Jet 200 gives you 140 × 46 cm. The Jet 300 gives you 150 × 51 cm. Both are meaningfully larger.
For walking and jogging, 130 × 45 cm is adequate for most people up to around 5 ft 8. You have enough length for a natural walking stride and enough width to feel stable. Shorter runners can jog on it without feeling cramped. Taller users or anyone with a longer stride will start to feel the length limit at higher speeds — that subconscious shortening of your gait when you sense the front of the belt getting close.
Width is the tighter constraint. At 45 cm, there is not a lot of lateral room. You need to stay fairly centred, which is fine at walking speeds but creates mild anxiety at running pace for some users. The Jet 300 at 51 cm is a different experience in this regard — 6 cm does not sound like much, but you feel it.
If you are buying the GT40z for walking, incline walking, and the occasional jog, the deck is perfectly fine. If you are running regularly, the deck size alone is reason enough to step up to the Jet 200.
One Series Cushioning
Reebok’s One Series cushioning sits underneath the running deck and uses rubber blocks of varying density arranged in zones. The front zone provides softer landing absorption when your foot strikes. The rear zone offers firmer resistance on push-off. The middle zone transitions between the two.
In practice, it creates a running surface that feels more forgiving than a bare deck but firmer and more predictable than the Air Motion Technology used in the Jet series above. Air Motion uses air-filled pods that compress and redistribute impact more dynamically.
One Series is simpler (rubber blocks rather than air chambers) but it gets the job done. Your knees and ankles feel noticeably less battered after 30 minutes of walking on the GT40z than they would on a cheaper machine with no cushioning system at all.
One Series cushioning also reduces the noise of each footstrike, dampening vibrations transferred through the deck and into the floor. Useful if you live in a flat or terraced house where impact noise travels.
Console and Programs
A 5-inch blue backlit LCD handles the display duties. Speed, time, distance, calories, incline, and pulse are all visible, plus a body fat reading. The screen includes a virtual running track display — a nostalgic touch borrowed from commercial gym treadmills that shows your progress around an animated track. Clear, readable, no lag.
Program variety is where the GT40z actually outguns the more expensive Jet series. 43 total programs versus 24 on the Jet 200, broken down as: manual mode, 36 preset workout programs, 3 user-defined programs (you set your own speed and incline targets), and 3 target modes for distance, time, or calories. A body fat test function rounds it out.
Those 36 presets cover a wide spread. From fat burning, to hill intervals, endurance, cardiovascular conditioning, speed intervals, and various combinations. More programs does not automatically mean better programs, but the variety here is genuine and gives you structure if you are the type of person who does not want to think about what to do each session.
No touchscreen, no internet connectivity, no streaming. If you want those things, they come via your own phone or tablet connected through Bluetooth to Zwift or Kinomap, propped up on the built-in tablet holder. In most cases, your phone already has a better screen than any built-in treadmill display.
Connectivity
Bluetooth connectivity with both Zwift and Kinomap is a major plus at this price. A lot of budget treadmills offer no app connectivity at all, or compatibility with a single proprietary app that nobody has heard of. The GT40z gives you two of the most popular fitness platforms in the world.
Zwift turns your treadmill into a virtual running experience — run through generated worlds alongside other users in real time. Kinomap adds real-world routes filmed from first person, with the treadmill adjusting speed and incline to match the terrain on screen. A 60-day free Kinomap trial is included in the box.
Both apps work through your own phone or tablet. You connect via Bluetooth, prop your device on the tablet holder, and go. No additional hardware required beyond the included Bluetooth dongle.
Worth noting: Zwift and Kinomap both have their own subscription costs beyond any free trial periods. The treadmill itself requires no subscription to use any of its built-in features. Every program, every incline level, every speed setting works out of the box, forever, with no monthly fee.
Folding and Storage
Reebok UPGRADED GT40z
- Soft-drop hydraulic folding — deck raises with controlled assist, no slamming, no pinched fingers
- Folds to just 103 × 77 cm — smaller than a single bed when stored upright against a wall
- 168 × 77 cm assembled footprint — fits comfortably in a spare bedroom, living room corner, or home office
- 61 kg with built-in transport wheels — one person can fold and roll it between sessions without help
- Lightest and most compact treadmill in the entire Reebok range — 26 kg lighter and 24 cm shorter than the Jet 300
The soft-drop hydraulic folding system raises the running deck upright with a controlled assist, preventing the mechanism slamming. Transport wheels on the base allow you to roll the folded treadmill against a wall or into a corner.
Assembled footprint is 168 × 77 cm, noticeably smaller than the Jet 200 (181 × 78 cm) or Jet 300 (192 × 86 cm). That is a real advantage in tighter UK living spaces. Folded, the GT40z reduces to 103 × 77 cm, but grows taller at 146 cm. Check your ceiling clearance where you plan to store it — if the room has a low ceiling or you are storing it in an alcove, measure first.
At 61 kg, the GT40z is meaningfully lighter than the Jet 200 (78 kg) and Jet 300 (87 kg). One person can fold and roll it after each session without difficulty. Moving it between rooms is still a two-person job given the weight distribution, but daily fold-and-store is straightforward.
Build Quality and Design
Black frame with red accents, understated and inoffensive. The GT40z looks like a piece of gym equipment rather than a gadget, which works in most living room or spare bedroom setups. No oversized branding, no flashy decals.
Frame feel is solid for the weight class. No perceptible wobble or flex at walking speeds, and only minor movement at higher running speeds, which is largely a function of the lighter 61 kg machine weight.
Heavier treadmills are inherently more stable, and the GT40z cannot match the planted feel of the 87 kg Jet 300. For its intended use as a walking and jogging machine, the stability is more than sufficient.
Floor level adjustment feet allow you to stabilise the machine on uneven surfaces — useful if your living room floor is not perfectly flat, which in UK houses built before the year 2000, it almost certainly is not.
What Could Be Better
The running deck is the GT40z’s main limitation. At 130 × 45 cm, it is functional for walking and jogging but genuinely tight for running, particularly at speed. Anyone over 5 ft 10 will feel the length limit. Anyone who drifts laterally will feel the width limit. If Reebok could add 5 cm in each direction, it would transform the machine — but that would probably push it into Jet 200 pricing territory, which rather defeats the point.
110 kg max user weight excludes a meaningful portion of UK buyers. The average UK male weighs approximately 84 kg, so most users fall within the limit, but anyone north of 17 stone needs to look at the Jet 200 (120 kg) or Jet 300 (140 kg) instead.
No wireless heart rate receiver. Heart rate monitoring is via hand-grip pulse sensors only, which means you need to hold the handlebars to get a reading. This breaks your natural running form and gives less accurate readings than a chest strap or wrist monitor. The Jet series above also uses grip sensors only, so this is a Reebok-wide omission rather than a GT40z-specific one — but it is still worth noting.
The warranty, while excellent, is a step down from the Jet series. The GT40z gets 10-year frame and 10-year motor coverage, versus lifetime frame on the Jet 200 and Jet 300. Still outstanding at this price, but worth knowing if warranty length is a deciding factor for you.
GT40z vs Jet 200 vs Jet 300
| GT40z | Jet 200 | Jet 300 | |
|---|---|---|---|
| Price | ~£599 | ~£799 | ~£949 |
| Motor | 2.0 HP | 2.25 HP | 2.5 HP |
| Max Speed | 11.2 mph | 11.2 mph | 12.4 mph |
| Incline | 12 levels | 15 levels | 15 levels |
| Deck | 130 × 45 cm | 140 × 46 cm | 150 × 51 cm |
| Max User Weight | 110 kg | 120 kg | 140 kg |
| Machine Weight | 61 kg | 78 kg | 87 kg |
| Cushioning | One Series | Air Motion | Air Motion |
| Programs | 43 | 24+ | 24+ |
| Frame Warranty | 10 years | Lifetime | Lifetime |
The GT40z wins on price, program count, compactness, and portability. The Jets win on deck size, motor power, weight capacity, cushioning technology, and frame warranty. Choose based on how you will actually use the machine, not the spec sheet that looks most impressive.
Where to Buy the Reebok GT40z in the UK
- Amazon UK — Around £599 with free delivery. 30-day returns policy gives you a safety net if the treadmill does not suit your space. Two-person delivery available on some listings.
- Sweatband — Typically around £599 with free specialist two-man delivery to room of choice. DivideBuy and Clearpay options available. Installation service offered for an extra fee.
- Decathlon — Stocks the GT40z through its marketplace. Pricing varies.
- Reebok Fitness Equipment — The official UK site. Check availability before ordering — the GT40z has been listed as backordered at times.
Assembly takes roughly 45 minutes with basic tools. Not difficult, but the 61 kg machine weight means you ideally want a second person to help unbox and position it. Sweatband offers a professional installation service if you would rather skip the Allen keys.
Reebok Warranty
- 10-year frame warranty
- 10-year motor warranty
- 2-year parts and labour warranty
A step down from the lifetime frame coverage on the Jet series, but still significantly better than the competition at this price. Most treadmills under £600 offer 1–2 years on the frame and 1 year on the motor. A 10-year frame and motor guarantee at £599 is exceptional value and a strong signal that Reebok trusts the hardware to last.
No registration deadline required to activate the warranty — unlike NordicTrack, which requires registration within 28 days or your coverage downgrades. Your warranty begins from the date of purchase with no forms or deadlines to remember.
Additional breakdown cover is available through Amazon and other retailers, typically extending parts and labour protection beyond the standard 2 years. Support runs through a UK-based helpline and online chat. One caveat: the warranty covers domestic home use only. Garages, sheds, and outdoor use are excluded.
Final Verdict — 4.1 RunRank
The Reebok GT40z is a well-executed budget treadmill that knows exactly what it is. It walks, it jogs, it inclines, it folds. It connects to Zwift and Kinomap. It comes with a warranty that makes everything else at this price look embarrassing. And it does all of this for around £599 from a brand with genuine UK support behind it.
Where it earns its 3.0 RunRank is on honest value — you get a reliable machine backed by a proper warranty from a company you can actually phone if something goes wrong. The 12 levels of powered incline and 43 built-in programs give you more structured training options than some machines costing twice as much. Bluetooth connectivity with Zwift and Kinomap is a feature that has no business being on a £599 treadmill, yet here it is.
Where it loses marks is the 130 × 45 cm deck, which limits its usefulness for serious running and taller users, and the 110 kg weight capacity that shuts out a portion of buyers. The One Series cushioning does the job, but the Air Motion system in the Jet series above is a noticeable step up in comfort and responsiveness. And the 10-year frame warranty, while excellent in isolation, sits below the lifetime coverage Reebok offers on the Jet 200 and Jet 300.
Buy the GT40z if you want a dependable walker and jogger with genuine incline capability and app connectivity, backed by a strong warranty, in a compact and affordable package. Do not buy it if you intend to run regularly at pace — the deck is too small and the motor too light for sustained high-speed use. For running, the Jet 200 at £799 or Jet 300 at £949 is where Reebok gets serious.
Best for: Walkers, incline walkers, 12-3-30 enthusiasts, light joggers, and anyone getting back into fitness who wants a trustworthy machine from a recognisable brand without spending £800+. The right first treadmill for people who know they do not need more.
Reebok GT40z FAQ
Is the Reebok GT40z good for running?
For light jogging, yes. For regular running at pace, it is limited. The 2.0 HP motor reaches 11.2 mph, which covers moderate running, but the 130 × 45 cm deck is tight for taller users or anyone with a longer stride. Walkers and joggers under 5 ft 8 will find it comfortable. Dedicated runners should look at the Jet 200 or Jet 300 for a larger deck and more motor headroom.
Does the Reebok GT40z need a subscription?
No. All 43 built-in programs, every speed setting, every incline level, and manual mode work without any subscription. Zwift and Kinomap compatibility is included via Bluetooth, but those apps have their own subscription costs. A 60-day free Kinomap trial comes in the box. The treadmill itself requires no monthly fee, ever.
Is the GT40z good for the 12-3-30 workout?
Yes — it is one of the cheapest treadmills that can do the 12-3-30 properly. You need 12% incline (the GT40z has 12 levels of powered incline), 3 mph walking speed (well within range), and 30 minutes of steady use (no problem for the motor). Set and forget. Read our full 12-3-30 treadmill workout guide for more detail.
What is the difference between the GT40s and GT40z?
The GT40z is the upgraded successor to the GT40s. Key improvements include a higher top speed (18 km/h versus 16 km/h on the GT40s), a wider running belt (45 cm versus 43 cm), and Bluetooth connectivity with Zwift and Kinomap support that the GT40s lacked. Same One Series cushioning system, same folding mechanism, same general design.
How heavy is the Reebok GT40z?
61 kg assembled — the lightest treadmill in the Reebok range. One person can fold and roll it using the transport wheels for daily storage. Unboxing and initial positioning is easier with two people, but the machine is manageable solo if needed.
How big is the Reebok GT40z when folded?
Folded dimensions are 103 × 77 × 146 cm (length × width × height). The deck folds upright, so you need ceiling clearance of at least 146 cm where you plan to store it. More compact than any Jet series treadmill when folded — the Jet 200 folds to 114 × 78 × 155.5 cm, the Jet 300 to 124.5 × 86 × 163 cm.
Should I buy the GT40z or spend more on the Jet 200?
If you primarily walk, do incline walking, or jog casually, and you are under 5 ft 8 and under 110 kg, the GT40z gives you everything you need for £250 less. If you run regularly, are taller, are heavier, or want a bigger deck with better cushioning technology, the Jet 200 at £799 is the better investment. The Jet 200 also upgrades to Air Motion cushioning and a lifetime frame warranty.
What warranty does the Reebok GT40z come with?
10-year frame, 10-year motor, and 2-year parts and labour — with no registration deadline required. Better than virtually every competitor under £600. Additional breakdown cover is available separately through most retailers. Warranty covers domestic home use only.
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