This bike is an excellent option. After about 4 weeks I can tell ...
927374
This bike is an excellent option. After about 4 weeks I can tell you that the bike rides very smoothly and is has a very comfortable seat. One thing I liked about the monitor is that if you leave it on scan it goes threw all the features as you ride so you don't have to keep switching them. If I had to change one thing about the monitor it would be km to miles just cause I like to keep distance in miles. But overall this would be a very good choice.
4838551
I really like this bike. It has a lot of support parts since its a big seller.  Lots of forums and videos on how to upgrade its weak points ie bearings and brakes.  Plus it is made of steel and has twist grip shifters which makes it great for an electric bike conversion which is what I did.  I went with majic pie version 5 and panasonic battery and am quite pleased with both the bicycle and conversion.

Edit: several months later.  What I said above still stands.  This is the 'jeep' of fat bikes- so many upgrades available it is great. Also after riding this fat bike with electric conversion I will never go back to skinny size tires again.  Fat tire bikes give much more confidence on all riding surfaces.  Some say to replace twist grip shifters: what I say is don't replace them if you are doing a magic pie v5 electric conversion which is what I did.  Twist grip shifters take up much less room than trigger type- leaving you with room for electric components.  Also on the megarange: great mod but if doing electric conversion you shouldn't need it.  Overall if you tinker and mid-sized you will love this bike!
4862109
Update 2:  This is truly a great basic commuter bike . Two problems that a have arisen were an inner tube valve that split at the base, easy fix. I gave the seat on this bike a few weeks to wear in and it was not happening. I got sick of my pelvic bones being mashed every day and purchased another saddle. There is also room on the handle bar for a bell, which is essential for urban commutes.

Update : I have been commuting on this bike for 1 week and absolutely love it. I did not feel it was safe for urban riding with just coaster breaks . I did install front side pull breaks size 61-79mm. This has perfected the stopping power in the bike.  It is impressively quick for a 1 speed bike and takes hills well with a little extra leg power.  Full disclaimer; I have only had this bike for 1 day, but have ridden a high quality road bike for a quite some years. If you are looking for a long distance, clip-in, wear your tightest spandex bike, stop reading right now. This is a BASIC bike, no frills, bells or whistles.

Pros: This is the lightest weight bike I could find. This is important because I am 5'1/ 110lbs and need to carry the bike within a building and up some steps before riding it . It is easy to pick up and even easier with carry straps.

The bike folds down in under 1 minute (novice) and has a low learning curve.

This a quick bike that rides smoothly and takes bumps, small curbs and uneven roads very well.

The color (grey) is more a purplish gunmetal color that is very pretty.

Both the front fork and back sections have holes where you can install side-pull brakes.

Cons:

If you do not have decent upper body strength, the frame latch may present a problem. It CAN be adjust but still takes a decent amount of strength to open and close.

I would NOT purchase this bike if you are over 150lbs, The frame is well made, but I just would not risk any issues..

The kickstand is cheaply made but can be replaced or removed.

The coaster breaks are just so-so. If you will be commuting in a city and need to come to sudden, fast stops, you WILL need to install hand breaks for safety.

Take away: This an awesome little bike that seems excellent for 1-5 mile rides. It is light weight and easy to carry. The price is on point and most of the cheaply made options can be replaced with whatever you choose. I would recommend it for anyone looking for that "last mile" option.
1115377
My 3yr old son absolutely loves this bike! He has gained confidence in his riding and balance. This bike is very very sturdy. My son rams this bike into everything, stands on the frame and it is still going strong. (He is very rough with this bike). We've had this bike for about 4 months, and is probably one of the best purchases we've made for our son. I highly recommend this bike.
2368986
This is a solid bike, especially considering the price. We've had it for about a month now and it gets used most days.
3106111
Knowing that I wanted a hybrid bicycle, I was torn between this bike and a Schwinn. The frame is well constructed and its light weight. It came well packaged, and even though the box had no damage, there were scuff marks and scratches on the bike itself from the zipties used to hold everything together. Putting the bike together is straight forward when some research online as the information provided is lacking. The bike did not come tuned and I had to spend some time fixing the gears and brakes. As a matter of fact, two of the shifter cables were damaged during shipping and I had to replace them. The bike did not include a tool kit either but all you need is a 5MM allen wrench and 15mm open wrench. I contacted Amazon regarding the condition of the bike received and they were extremely helpful; unlike Diamondbike themselves. Chances are I would buy the bike again as it works well and feel great after you spend sometime getting it right.
2299671
I decided a few weeks ago to buy a fixed gear bike, after many days of research and looking around I ended up with this one.  For the price, you really can't beat it. When it arrived, the box was in great condition.  It took 15-20 minutes to put everything together and I was on the road.  Like many other reviews say, the seat is quite uncomfortable.  I ended up paying an 20 bucks for a nice Retrospec seat.  Also, I have gotten a few other things for the bike but out of box it's most definitely rideable. The description says that it's a no-name brand but after research I believe that it, or atleast the frame, is made by Vilano.  I've only had this bike for a week now, but I've riden an easy 40 miles and have had NO problems at all.  I would highly recommend this bike to anyone who is thinking of getting a fixed/single speed bike!
3638635
This is a wonderful bike.  It went together easily and is very well made.  We also paid less (about $20) thru this website.  The colors on this bike are absolutely gorgeous!  My son just turned 3 and started riding (in circles of course).  The bike is a good size for him.  I would buy the bike again without a second thought.
2724932
I wanted to wait some time and use this bike to make a good review on the product and I have had this bike for about 4 months.  I have a few bike snob friends, many who swear up and down to use the local bike shop or craigslist but I hadn't biked in over 10 years and didn't know how serious I would get into it.  If I was going to go the lbs or used bike route I would need to spend at least $300 dollars for a bike I deemed reasonable and the GMC Denali was half that price.  This bike isn't spectacular but it gives you a good bang for your buck if you have just started biking, wanting to get into racing or need something simple to get you across town.  If you already know you are planning on biking a lot or have trouble with putting things together this may not be the way go.

Problems Encountered:

The tires and tubes are definitely on the cheap end, but they work for what they are supposed to do, but if you plan on riding on anything that isn't like super awesomely paved and clear you may encounter problems.  I generally have to pump my tires once a week to ensure they are okay, but when I go into the downtown area and there is all bricks it generally loses air quick.  If you are only using this for say once or twice a week, it wouldn't be a big deal, but if you plan on biking everyday you will need to get this fixed.  Tubes aren't that much to replace... tires on the other hand... it depends...

The worst thing about this bike are the brakes, they are really cheap and honestly it's coming through a shipment.  If you don't have anyone who knows how to properly tighten your brakes, you are probably better getting a bike through a local bike shop because you will end up having to take this there if you don't know what you are doing.  Lucky me I know some people and it is pretty simple if you know what you are doing.

Now with a price tag of $150 I can deal with these problems, because they are something I can personally fix.  The gears are excellent, and I have had a lot of fun starting to bike again that I plan on getting a better bike now in the near future, but I will still keep this one.  In the long run I can still use the frame and have a decent bicycle.  I am really glad I purchased this bicycle first so I could gouge what price I should spend when I want a better bike.

So In Summary...

If you are a beginner and a good handy man this bike is for you, otherwise stop looking on the internet.
1540483
We did a bit of (internet) research before we bought this bike for my (then) 6.5 year old daughter, Christmas 2013. She had well outgrown her 16" bike. It's now Fall of 2014 (she's 7.5 now), and she's finally riding it comfortably.  She's average height, so I'd say this bike is a "big" 20 inch wheel bike.  So we had a few frustrating months there.  But the bike assembled easily, and rides very well; smooth and sturdy.  She loves it now.  It looks great too.  Even after a fair amount of use, the white hasn't dirtied.
1433138
This bike is great in my opinion. I am new to mountain biking and this is the first bike I have ever owned that has dual suspension. It is awesome to feel the bike react to going over bumps and uneven terrain. This is also my first time assembling a bicycle. I had a bit of trouble getting the front wheel and brake correct. The directions are a bit difficult to follow, but that shouldn't be surprising.  When are directions for putting together anything easy to follow?  The problem I was having was after I had the wheel on, I simply spun it to ensure it would spin, and I could tell it was dragging against something because it would only spin for a second then stop.  It took a lot of reajusting, loosening, and tightening before I got it correct with the break and wheel combination.  A bit more work than I expected. Now the wheel spins freely.

The other problem I am having is with the left gear shifter. On the third gear the bike sounds like it is having trouble shifting. I am reluctant to fooling with the gears to fix the problem because I am afraid that I might mess up the smoothness of the other gears shifting into action. Every other gear shifts perfectly fine and quietly. It's just the third gear on the left shifter that seems to be bad. I am new to mountain biking, perhaps I just haven't figured out how to shift correctly yet.

Also I want to make mention of the weight of the bike. It is a bit heavy but I am a firm believer that it isn't the bike, it's the ridder. I'm sure Lance Armstrong on this bike can beat me any day in a race against me riding one of his light weight million dollar bikes.  With a little practice and confidence, I can see this bike being very efficent in strong mountain biking exercise, training, and racing. I am also 5'10", 168 lbs and I believe this bike fits me perfectly- for those of you who were like me, hesitant to buy because you aren't quite sure this bike will fit your stature. I would say this bike is good for those who are 5'9" and taller. I am close to the bottom setting on the seat. Also, the bar in the middle makes me a bit nervous. It would have been nice if GMC angled the bar just a little bit lower. Hopefully I will never meet it, if you know what I mean.

I think the bike is great for the price.  It works just how I expected it to.
3288333
After putting this bike together (which wasn't bad...except for figuring out the fork lock), the bike looked beautiful.  The only problem is it needed to be adjusted by a local bike tech because it didn't shift well.  It was all out of alignment.  It took him about 20 minutes to get it fixed and now it shifts beautifully.  Drops right into gear.  If you are buying here on Amazon to save a little money, I would factor in about a 20-30 minute visit to your local bike shop to get the gears and chain aligned.

The bike is a pleasure to ride and I usually do about 6 miles a day on it minimum.  I haven't noticed anything to be concerned about except the following:
1.  The Disc Brakes rub every so slightly.  My bike tech said this is the nature of disc brakes and unless they are slowing down the wheel a lot, just ignore it.
2.  I have a new sound developing in the front wheel which sounds a little like "metal on metal"  It is only when I am leaning forward and putting more weight up there.  Probably the disc brakes too but I am not sure.
3.  There is a slight clicking "tick" sound on every rotation of the pedals.  It happens in the same place every time when pedaling a little hard. It's not a huge problem, but I haven't been able to pinpoint its source yet.

I would certainly recommend this bike to anyone looking for a fair price for a great bike. Also, my neighbor ordered the black version of this bike without the hydraulic brakes and the locking fork.  I guess you could go either way on that one, but I really like the locking fork when pedaling hard up hills (no bouncing around).  Also the hydraulic brakes are VERY responsive.

Enjoy!
2227082
This bike is very well made, the frame components seem strong and the welds seem  solid.  The pedaling motion is smooth and quiet and the seat is comfortable. When unboxing, the individual  components do not weigh much so you can carry each one to the assembly point without carrying the entire box there.  All the tools needed for assembly are included, if you have your own tools, they would probably be of better quality and easier to use.  It took about 2 hours to assemble working at a slow relaxed pace.

My bike arrived with large deep scratches on the top of the two-piece plastic cowling due to the rear seat frame contacting it during shipping.  They were actually more like broad gouges with the top color layer scrapped off exposing white plastic underneath.  Some other reviewers mentioned this so there appears to be a problem with the packaging design.  I called the support number in the manual and they sent me what they termed left and right covers for free with free shipping and told me to discard the old ones.  I got the feeling that they will make right anything that is wrong.

Replacing the covers was not difficult and it gave me a chance to inspect the internals which appear to be very well made.  There is a one piece Ashtabula style crank with an adjusting nut so that if the crank ever develops play, it could be adjusted and bearing replacement would also seem possible. There is a flat rubber belt driving the flywheel that is also adjustable.  A parts list diagram is included in the manual so spare parts can be ordered if needed.

We originally tried to buy a comparable bike at some local stores but they did not have much selection or stock.  It would have been hard to load it in and out of the car as well so I think the best bet is to buy it here and get it delivered.

UPDATE: 4/22/2014 - I had bought the above bike for my parents, it was very good so I just bought another one for myself. I took me 2 hours to assemble it, not including a half hour to unpack everything so 2.5 hours total (even after having assembled the other one previously).  Assembly is long but easy, take your time and relax.  There are two identical cables for the pulse sensor that thread through the frame, one for each hand grip. Don't worry about crossing these connections, it won't matter and there are no instructions or markings indicating how to keep them straight. My bike came delivered with a cracked Rear Stabilizer End Cap but I called the number in the manual and they shipped me a replacement at no charge. Given the high quality, great design, low cost, good support and delivery directly to your door, I highly recommend this bike.
2861594
I have had this bike for over 4 years now and I use it 5-6 days a week and it is awesome. In this price range this bike continually is a category winner for the belt drive and the ability to get setting right for smaller riders which I am. Belt drive is a must because of the smoothness, quiet and the low cost of maintenance since there are far fewer parts that can wear down.  Additionally I have only a small space and it has one of the smaller footprints which is a huge help. The bike has a basic computer and connects to blue tooth HR. Fundamentally, the company invested in the physical bike and the belt drive system which is why the price is so reasonable. Only other category options are over 2x price (excluding their SB900) in the Kieser M3i or Peloton for which most of the additional cost is in tech upgrades and not bike technology itself.  If you want belt drive which I consider a must to keep cost of ownership down. Mine is used a lot (avg 5K+ miles a year) it needs a service every couple of years. Parts are reasonable price and generally limited to bearings and belt being needed to be replaced.  I tricked mine out with a couple of essentials for comfort,  logitech comfort lapdesk which fits perfectly on the handlebar area to convert it to a flat surface i can have IPAD and coffee on while I ride, bike handlebar tape and gel grips for handlebar comfort, a proper bike saddle and bike pedals.  Motifit is a great app that you can use to track HR more effectively.  As long as you don't need Wattage this is the best bike hands down.

What compelled me to make a review was their customer service. After over 4 years of continual use , after my most recent service I started having issues with the belt. I spoke with their service team and they could not help and they asked me to speak to their returns.  They technically could have done nothing but they replaced the bike so they could figure out why the repairs had not worked. This blew me away.  Cant wait for the next 20K miles on this bike ...
3764174
Great bike!  Just the right size for my 7-year old.  This is his second bike and he was able to jump right on and ride it.  We like that it has a coaster brake as well as the hand brake.  This will be a nice transition.  The colors are as brilliant as shown in the description.

It took me about 20 minutes to put together and all the hardware and tools were included.  The wrench for the axles is a little cheap and it bent open before the axle was as tight as I preferred (which was probably overkill).  I used one of my wrenches to tighten it a little more.  The tires were a little low, but he was able to ride the bike before I got around to filling them up the rest of the way.

We have a gravel driveway and he leaves a 10' skid mark every time he comes in the yard.  The rear tire will have to be replaced soon, but that's no fault of the bike...
1356212
This bike is very expensive but worth every penny IMO. It is just like my old Schwinn Airdyne AD4. The seat is pretty comfortable too but I plan on switching seats. I keep the bike outside in a utility bldg. so I will need to buy a windscreen when I ride during the winter months. My old Schwinn Airdyne lasted me over 11 years. I am hoping this one will last me at least 20 years. It should bc I am the only one who uses the bike and this bike is better built than the AD4's. I do ride it about 12 miles / 5 days a week, sometimes six. The bike was also very easy to assemble. Just watch the video here at the Amazon website or you can find the same video on youTube and enlarge the video to full screen. I would start and pause the video during the assembly instructions. It should not take more than 30-45 minutes tops to assemble. I don't do any of the HIIT. I simply use the bike at a moderate pace for overall cardiovascular fitness. Bike was delivered very quickly via FedEx and I am not even an Amazon Prime member.

Update (1/24/2017) : I will also add as some others have said that LifeCORE Fitness customer service is second to none. They had to send me another monitor. The one that came with the bike stopped displaying RPMs for some reason, even after making sensor proximity adjustments. The bike was also making a squealing sound that I did not like and the two linkage arms that connect the handlebars to the crank assembly had to be replaced. LifeCORE Fitness sent me all the parts and tools need to do the job free of charge. Now, bike is running great and I hope get many years of enjoyable use out of the bike than I got with my old schwinn airdyne AD4 which was a terrific bike I might add. Schwinn made a huge mistake when they quit making this bike IMO. They have now introduced the schwinn AD Pro to try and compete with the Assault but it is belt driven. I like the chain personally. They say the Schwinn AD Pro is one helluva bike, but I am happy with my assault. Thank you LifeCORE Fitness for the wonderful customer service when I had a problem. Also, I suggest you watch the bike maintenance video on youTube and do the things suggested. They are very easy to do and will extend the life of the bike. They are just checks. I have not had to do must adjusting. Just get on and go. March 2017 will be my one year anniversary.
1856253
I purchased this Schwinn partly because they seem to have maintained a long-standing  reputation for quality and also because I loved mine when I was younger. I primarily wanted a relatively lightweight , solidly built frame and this bike has it. The 700c wheels seems rather popular for hybrid bikes and have been well -received by many commuters. This wheel does not have nearly as much drag as a mtb tire and more protection and gripping power than a thin road bike tire.

The bike comes nearly fully assembled and is well packaged, inside an inner and outer protective carton. Setting up the handlebars, pedals and seat were a snap.

The whole process took about 15 minutes.

The frame is painted a very nice black (So I'm told, It actually looks dark green to my eyes), though it isn't the same frame seen in the product photo (The down tube is much thicker on the bike I received). The saddle is very, very comfortable and the adjustable sprung aluminum stem is a nice bonus, accommodating a variety of preferred sitting/riding styles.

Braking is very even and responsive with little fade. The bike feels well balanced while maneuvering and provides  very forgiving handling characteristics. The front suspension fork is lightweight and mostly responsive on the rebound. IMO, it needs a bit more pressure but I've yet to get to it.  I'd recommend experimenting with the proper pressure based on your weight and riding style.

The cables are well protected and insulated from the frame to avoid scratches.  The fenders and baskets are easily removed, should you choose to do so (I did. It took about 12 minutes because you need to remove the rear tire to get at a screw for the rear fender). Adding a quick release hub to the rear tire (the front tire already has one) would be an inexpensive and highly useful tool, IMO.

I'm about average height and weight (5'7"@ 165lbs) and I can ride for hours without discomfort on the stock saddle. Shifting is easy and  smooth and the system never skipped a gear, even when pedaling uphill and changing gears.

I recently compared this model to a few local bike shop products that cost $200+ more than the Schwinn. The overall workmanship/fit and finish of the Schwinn holds up well compared to the popular models I saw.

The bike is equipped with bike shop quality components, albeit not the high end, that will generally perform quite well.
After checking out several department store bikes from Walmart and Target, I'd definitely recommend staying away from the lesser quality bikes commonly sold in department stores. With few exceptions they tend to have cheaper, heavier frames and poor quality components and poor fit and finish in the assembly.

Comparing frames among several bikes (including this one) ranging in price from ~$300 to ~$900 yielded components of Chinese manufacture with finish of the welds, weight and general construction approximately equal.

I'm not suggesting the Schwinn Crrest is better than a well build bike shop bicycle like a mid-grade  Giant, Trek or Santa Cruz, but the latter could set you back anywhere from $600 to $2000, easily.

I am suggesting that, this bike is comparable, for the average, casual road or paved trail rider, to much more expensive bikes I've looked at and ridden.

Happy trails.. or roads