My son has had the bike since the end of September, the paddle broke two months ago. Today the chain is completley rusted, and the brake broke. This all while just riding the school. He is 16 and uses his bike only to bike a half mile to school. I never had these problems with my department store bikes.

For me, product and support go hand-in-hand. Regardless of quality, if you can't support me in a timely, friendly manner, then I can't support you. With 6KU, there's no question that the quality in these bikes is there when we're talking a $200-$400 price range. Sadly though, my experience with 6KU's customer service has been subpar -- and that's being generous.

Back on July 10th, the pedal thread on my left pedal arm unfortunately stripped within the first 30 days of the purchase date. While it doesn't sound like much, let me say that having a wobbling pedal makes the experience of riding far less enjoyable. I figured, "Eh, first 30 days, no big deal. I'll contact support, and they'll review the inquiry and get a replacement part shipped to me by next week." Wrong. It is now July 28th (18 days later), and my contacts are as follows: 3 e-mails, 3 phone calls, and a chat session, all of which I have had to initiate, and with only -- one -- follow-up from support to show for, even though they've assured me multiple times that they would. That said, the funny part is that I am still getting the run around! My most recent contact (which was the chat session), I was redirected to speak with the agent handling my case, which I completely understand, but what do you when they don't respond, and when they only provide empty promises?

Anyway, all the while, I have a brand new bike that is parked over a situation that, I feel, should have been resolved already.

My advice: Consider other companies first.

You get what you pay for, and then a little more....problem is your not paying very much. Overall this is a solid bike for the price, but don't expect any frills or reliable parts. I ride this bike every day as my primary mode of transit, probably around 50 miles every week.

My 5 month review (part by part):
Frame & Fork - 4.5/5: Very happy, minor gripes are a 'hard shell' enamel style paint that chips easily and the lack of mounting points for any sort of water-bottle holder etc.
Wheels 5/5: No complaints here, just know the black paint/coating will be quickly worn off the rim by the break-pads.
Flipflop Hub 2/5: This had a little 'grind' and uneven resistance right out of the box. After months of riding it has only gotten worse. Unimpressed, soon to be replaced.
Tubes 4/5: Had some ruptures fairly quickly, though I do ride it hard over rough city streets.
Breaks 4/5: They work well, and I am glad to have front and back. However the front breaks came a little bent meaning the pads are impossible to correctly align and wear faster. Also the pads it comes with are fairly stiff but get the job done.
Crank and Sprocket 5/5: I want to rate them lower as they seem very cheap. That being said I have had no problems so....
Pedals 4/5: They are nice and large!! Though the plastic does give a little flex under full weight when peddling. Could be more sturdy. I upgraded to metal fairly quickly.
Handlebars and Neck 5/5: I was expecting to buy a set of bullhorns, but these really do feel great. The short length and angle of the neck make them feel very aggressive.
Seat 2/5: I mean technically there is nothing wrong with this. But I am used to riding BMX plastic seats, and even those were somehow more comfortable. It really put a lot of uncomfortable pressure on me when seated in almost any position. I replaced this within a week.

TLDR: The big parts they get right, everything else is where they save money and bring the cost down. Still a good deal, expect to replace a bunch of parts in the near future.

First I don't ride every day, when I do once a week I ride about 30 miles on it. I have had it for about a month now so I have a bit over 100 miles on it. With that said this is what I think about this bike.

The bike is solid, nothing sound on it even though I did not fine tune it just put it together, well pack and easy to put together. It's fast and I feel the gear ratio is perfect,I live in Florida everything is flat here so it's perfect, even when I'm climbing it feels nice and light. Brakes are good too, everything feels of good quality till you get to the pedals. In fact the treat in one of them was almost bad I had a hard time to install it. Saddle I ok as well, after 20-25 miles it hurst without bicycle shorts with bike shorts it's not so bad.

In general I think the bike is got all it needs to exceed expectations of anyone that understand how much this bike cost.

Update: 17 Aug 2017

I wanted to wait until 500 miles to give an honest update, but I don't see the point.

- I never received the promised replacement tire, which had a defective wall, allowed rim slippage, and blew several tubes tubes (images attached).
- I did receive a replacement tube, which was nice but didn't address the problem.
- At 200 miles every.single.bolt/nut/washer/etc began rusting. Now at 414 miles, they are *all* gruesome, requiring replacement.
- At 300 miles all of my spoke attachment points began rusting (freaky - never experienced something like that).
- Crossing the 400 miles threshold saw my bottom bracket begin making creaking noises normally associated with heavy wear and poor maintenance (400 miles? I know how to maintain a bb).
- Positives: great stem; light frame; spirited (if not sporty) handling; and, sleekness.

Riding conditions: flat urban start/stop commute
Location: Boston
Weather conditions: all weather, but stored in dry conditions only
Rider: 123lbs

I lowered my previous 3-star review to 2-stars.

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I will update this review again when I can actually ride the bike.

I built it tonight - if you've put together a bike in the past nothing will surprise you. It's incredibly light, and packed *very* well.

Unfortunately, the final step after truing the rims and setting the brakes is to air the tires. The Kenda tires say that the max is 110psi. My target was to have been 100psi (I have a high end pump with a reliable pressure gauge and I've used these same tires in the past).

About two minutes after airing up the front tube popped. And when I write popped I mean blew the side wall of the tire out from behind the rim's edge. In over 35 years of riding I've never had that happen. The size of the hole is such that it could have only been a structural issue during manufacture.

Unfortunately, this made a bad first impression since I can't ride it until I get a replacement tube ...for a new bike. Woe is me.