Good morning
I bought this treadmill, 10 days ago, even though it came pre-assembled, it still requires a lot of work to adjust so that the motor works smoothly.
When I unpacked it and started it for the first time, I noticed that the motor was struggling to work even without any load. I tightened the adjustment screws with an Allen wrench, but even now when I use the treadmill, I still notice that even after the adjustments, the motor struggles to carry my weight (70kg) while walking.
I wonder if the 1.5 hp (1100w) is not enough..
At this point, I would like to ask those who have it and use it before me if this struggling is normal.

I have had this treadmill for 4 months. For the price and the reasons I bought it (375 euros & free shipping to Athens/only for walking), I am quite satisfied and I don't regret it. The "advantages" for which I primarily chose it were its small dimensions and mainly the ability for complete folding and vertical storage (I had space issues). The low price, the fact that it is manufactured or assembled by a well-known Greek company (and there will likely be support if/when needed), and especially the fact that it did not include any (profit-driven) "markup" of 20-30% due to the increased demand for sports equipment (due to Covid), as was the case with 2-3 other treadmills (with similar characteristics) that were initially options for me, but were ultimately completely removed from my list, solely because of this unacceptable practice. So, I chose this particular treadmill (which was initially my third choice) and ultimately preferred to have it permanently set up because although full folding is possible, it is a bit of a hassle and due to the small dimensions of the device, it was not completely necessary for me. Now let's move on to the review of the treadmill itself. The most important thing you should keep in mind is that the "advantages" I mentioned earlier are also "disadvantages" (to some extent). The small dimensions of the treadmill are convenient for setting it up in a limited space, but they also result in it being quite light (only 35 kg), which makes it somewhat unstable, and as the speed increases, so does the instability. If you want to buy the treadmill only for walking (like me), then the instability is relatively small with speeds up to 6.5-7 km/h (fast to very fast walking) and is probably tolerable, but forget about it for more and especially for running! Even if you don't "move" yourself from the treadmill as you run (due to the limited dimensions of the belt), the treadmill itself will "move", meaning that within 30-40 minutes, the treadmill will have moved a meter or so on its own. Also, keep in mind that the maximum user weight should be up to 90 kg, so calculate a maximum of 85 kg (including sports clothing and footwear, of course) so as not to excessively strain the motor. Another thing that bothers me a lot (but the same applies to many other treadmills, even more expensive ones) is that there is no "pause" option. If you need to pause for a while (e.g. due to a phone call), you can only stop the machine, so naturally all the indicators are reset. (For God's sake! It's 2021! They still couldn't install a chip that has this obvious feature?). For this particular issue, before purchasing, I called the company/representative (Viking) myself to clarify it, and they told me that "generally" their treadmills function as "pause" if you lightly press "stop", but this is not true (at least for this specific model), and I had specifically asked them about the exact model. The user manual is also INADEQUATE. It tells you the very basics, but it does not provide ANY INFORMATION about the pre-installed programs of the treadmill, so I never used them. Conclusion: I recommend this treadmill, priced around 320-380 euros, as a decent economical solution for those who have limited space and are interested ONLY IN WALKING (normal - fast - very fast) and are not overweight or have a long stride (e.g. tall individuals). Additionally, always remember that all treadmills require lubrication under the belt, usually every 30-40 hours of operation, with silicone spray (or oil) (it is a fairly easy and quick process), otherwise you will "burn out" the motor and it will not be the "machine's" fault of course! I gave a fairly good rating to this treadmill, despite its limited capabilities, as this was somewhat expected (since I chose a compact and lightweight treadmill and at a fairly affordable price). Therefore, my remarks regarding the limitations of this treadmill are mainly intended for you to consider, in order to judge for yourselves whether these limitations meet (or not) your requirements.

UPDATE 30/1/2023: Pay special attention to the issue of belt lubrication: neither should there be no lubrication at all, nor should there be "over-lubrication". In fact, "over-lubrication" may be worse than no lubrication, because the excess lubricant causes the belt to "stick" to the wooden floor and the motor to exert excessive effort to turn it, resulting in overheating and "burning out". Some characteristic indications of over-lubrication are: a) lubricant stains formed on the top side of the belt (usually at the point of attachment) after using the treadmill, where you wipe them off and the next time you use the treadmill, even without additional lubrication, they reappear, b) a characteristic sound of "straining" during the first few minutes of using the equipment (usually when the speed is still low) due to the belt "sticking", c) unusual overheating on the cover (just above the motor) as well as on the belt, d) a smell like "burnt oil", particularly strong after 30-40 minutes of treadmill use, and if you continue, something like "vapor" (it is the excess lubricant that, due to the overheating of the treadmill, also overheats and starts to evaporate). If something like this happens, stop immediately and try to wipe off as much lubricant as possible from under the belt with a cloth (you may need to do it several times). Prefer to use lubricant from the same company (Viking), which may be slightly more expensive (15 euros) but is of very good quality. The first silicone spray I used (lasted almost a year) was a general-purpose one, bought from a supermarket, but it was obviously of good quality and never caused me any problems. When it ran out, I bought another one, even from a well-known sports equipment company, which was supposed to be specifically for treadmills. However, it turned out to be of poor quality, as even though I applied it in the recommended quantity and time interval (just like with the previous lubricant), due to its probably low silicone content (resulting in excessive "liquidity"), signs of "over-lubrication" appeared very quickly (after 2-3 lubrications), which I was not aware of at the time, so I continued to use it and eventually the motor "burned out". Although I was within the warranty, the responsibility was solely mine, but fortunately Viking's service covered me to a great extent, meaning they replaced the engine without charging me. However, they suggested (and I agreed) to also replace the carpet (at my own expense, costing 80 euros, plus 40 euros for transportation - round trip, using their vehicle, to their company for inspection and repair, as I do not have a means of transportation) because even though they cleaned it as much as they could, the poor quality lubricant had literally "soaked" it and there was a risk of the same problem occurring again.

A treadmill that is worth more than its price, I have had it for about 3 months and I believe it is one of the best home treadmills for its price currently available in the market. Its major advantages are its very accurate dimensions for the average user, its complete foldability, which takes up minimal space and can easily be stored even under a bed. Another positive aspect is that it is completely silent, which is very convenient because the user can use it at any time without disturbing anyone. The functions and programs it offers are sufficient for the average user, the only drawback being that it does not have any adjustment for the belt tension, neither mechanical nor electrical, as wrongly stated in its specifications.

Update: After a year of almost daily use, by two or three people many times (with intervals between uses and one hour of continuous operation for each user), the treadmill is still going strong, the only thing it needs regularly is proper lubrication with silicone oil specifically for treadmills and a good cleaning before application.