ROCKBROS Bike Rollers Adjustable Bike Trainer Stand Foldable Indoor Cycling Bicycle Roller with Resistance for MTB Road Bike Exercise

I wanted to find a decent set of rollers at a good price. I compared these to the Minoura Moz Roller which is priced $40 or more higher and had very good reviews on the web and could not find any difference at all. I received them and am very pleased with the finish and function of them. They even came fully assembled which I did not expect and a spare belt was included in the box. A great product.Added note: I took a straight edge to the roller and as stated in previous review they are not parabolic rollers this is simply stated a misrepresentation of facts. However once riding is learned it is really not a concern. If it is important for you that they be parabolic rollers keep this in mind. I'm still pleased with these but want buyers to be aware.

This is an entry-level bike roller, so the 4-stars are relative price/performance, and not relative to other more expensive bike rollers. The overall build quality felt good and solid to me, though the aluminum rollers feel like they wouldn't take much abuse. It came with a spare belt which is cool. Had the product arrived with the roller tension dialed in and ready, I would have given it 5 stars.Out of the box, this thing is not useable in my opinion. You must loosen the roller bearing tension, which as others have mentioned, is far too tight. The nuts required a 17mm wrench. You'll need to loosen the outside cap nuts first to gain access to the interior bearing nut. You'll want to loosen these as much as possible without leaving the nuts free to spin or introducing wobble in the rollers. Once these are spinning mostly free, re-tighten the outside nuts to secure the rollers. After that, you will want to place your bike on the rollers to examine the spacing of your front wheel. You will want your front axle to be directly above the front roller. The product is adjustable if necessary and there's a video associated with this product listing showing how that's done.Once the bike roller is set up, you're ready to get started. You'll need to find a level place where you can lean against a wall or hold something reasonably sturdy in order to start pedaling from a stopped position. A wall is better than a stool, since you can lean against it with your shoulder (not your elbow) and start pedalling with both hands on the handle bars. Start pedalling and try to gain balance on the rollers a little at a time. It doesn't take too long (15 - 60 minutes ?) to catch the hang of it but at the beginning it will seem impossible, as well as a bit scary. There are reasons for this which I discuss below, but if you're determined, you'll get there.Videos make it look easy, right? So why is it so hard when you're just starting out? Well, in a word.... momentum. You will have none and on a bike roller, you'll never have any. This is important because outside help we get from the gyroscopic effect of rotating wheels, momentum solves a lot of problems for you while riding a bike down the road. It allows you to take the road at your own pace, and keep the bike under you if you encounter a rough patch or trouble. There is a big departure from these things on rollers. 1.) You must keep pedalling in order to keep the bike under you. The instincts you developed to coast, and allow your forward momentum to keep the bike under you when encountering trouble will be of little use on bike rollers. On rollers, the lack of forward momentum means coasting is very unproductive at solving problems. If you run into trouble, you'll need to learn to pedal your way out of it. Adjusting your riding style like this isn't automatic. Though it takes effort, it comes reasonably quickly for most riders. Pain and fear make these lessons go quickly. It took me one hour and one broken closet door to get there but I made it. 2.) You can't take the ride at your own pace. There are no breaks unless you depart the bike. Rollers demand you keep the minimum amount of speed to stay upright on the bike. You may get good enough to slow it down but it will never be zero like it can be on the road. Every ride is continuously uphill. Because of this, be patient with how long you can sustain a ride. Two minutes doesn't sound like much, but it's a good goal if you're buying this to get back in shape and haven't ridden in a while. This sounds very short but with the amount of work you will be doing to stay upright and the fact that you can't coast, your heart rate will jump quickly and your quads will burn before you know it. So take frequent rests as you go. On the upside, because the work is in short spurts, I didn't notice much muscle soreness afterwards, despite disembarking from the bike with my legs on fire.Bottom line: this is an affordable way to keep riding, either in tight spaces or when weather is inhospitable to cycling. These are cheap rollers. My guess is, if can master these, better ones will be even easier if you decide to move up a model. There are obvious compromises which shouldn't be a surprise at this price mark, and they might be a little frustrating, but none of them prevented me from using the product. With proper expectations and persistence, you'll probably enjoy this product.

The trainer works great, but it took me a few hours to get the rollers set up correctly.Initially I thought the trainer was defective because the rollers wouldn't spin with the weight of the bike, and I was getting ready to return it. Thankfully other reviewers mentioned the rollers are set too tight at the factory and need to be loosened. Your trainer rollers might be different, but once the mine were tweaked, the trainer works great.Be careful if you've never used a roller trainer before - it's not as easy as riding on the road. We have a 4-post bed that I held onto until I felt comfortable.The only assembly was attaching the drive belt and unfolding the trainer. They give you a spare drive belt and the tools needed to move the front roller if needed.I'll only use the trainer in the winter, so also appreciate that it folds up for storage and isn't crazy heavy.Good price point as well.

The media could not be loaded. First, some advice for beginners, since I see complaints in the reviews that these are hard to use:1. Before you do anything else, you will need to loosen the inner nuts a bit to allow the drums to spin freely. Everything is over-tightened at the factory. In my photos, I have indicated the tension nut with a pencil. Loosen the outer nuts with a wrench to allow some play in the axle, and then loosen the inner nuts enough to allow the drum to spin more freely, but not enough that it rattles on the axle. Then re-tighten the outer nuts just enough to secure the frame again.2. Set up the front roller so the bolt on your fork sits directly above the center of the roller. There are holes to move the roller back and forth for this purpose.3. Place a box or small stepstool next to the rollers to help you mount your bike. More expensive versions have a step integrated into the design for this purpose.4. Speed is your friend. It is easier to balance with your wheels spinning faster.5. Focus your gaze a few yards in front of you as you would riding on the road. This helps you balance.6. Watch a few youtube instructional videos. They are hilarious and also helpful.If you're new to these, you'll find that riding in place is a weird sensation, because, unlike a stationary trainer, these require you to balance just as you would on the road. Learning to use rollers takes practice, so don't get discouraged. I am a lifelong cyclist, but I haven't used rollers since 2004, so I'm essentially a novice again. Nevertheless, I managed to get going in less than 30 minutes. You can see in my video that I'm definitely still finding my balance, but I'm basically there. I didn't even fall and hit my head on the coffee table!THE ACTUAL PRODUCT REVIEW:I realize this is the very lowest end of the scale, price-wise, so I didn't expect fine engineering, but I hoped it would at least arrive without any actual damage. The front roller is dented out of the box, and, while still useable, I do notice whenever my bike drifts over it. The black finish is cheap, and will chip off if you aren't careful while adjusting the bolts. Even the logo decals are cheap, and had partially flaked off in transit. Like other reviewers, despite this arriving fully assembled, I was frustrated by the lack of English instructions. As you can see from my photos, the diagram is so poorly photocopied, that even that part is virtually unreadable.I'm just getting back to using rollers after a long time, so I wasn't sure I wanted to spend a fortune on them. These will get me through the rest of the spring, but eventually, I will most likely upgrade to something better.