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  • Critical Cycles Diamond Frame 7-Speed Shimano Hybrid Urban Commuter Road Bicycle, Black, Small/50cm
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Critical Cycles Diamond Frame 7-Speed Shimano Hybrid Urban Commuter Road Bicycle

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Price: $275.00 - $299.99
  • Lightweight Hand-Built Diamond Steel Frame designed with an Upright position -- perfect for Urban City Commuting, Leisure Rides, or Exercise
  • Standard with Kenda Kwest Tires (50 Value), the perfect hybrid/touring tire designed with smooth rounded tread with large water dispersion grooves
  • Shimano 7-Speed Drivetrain utilized for the modern, urban hybrid rider, with retro appeal and admirable functionality
  • Commuter Bicycles are available in small & large sizes, as single-speed or 7-speed and all tools are included to build your own bike
  • Includes many add-on features such as Rear-Rack, Front and Rear Fenders, Vintage Style Chrome Bullet Headlamp
Need help buying the perfect bike? Visit our Bike Buying Guide with complete information on bike types, best uses, and how to measure for the right bike size and fit.

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Frequently Bought Together

Critical Cycles Diamond Frame 7-Speed Shimano Hybrid Urban Commuter Road Bicycle + Kryptonite Kryptoflex 815 Combo Cable Bicycle Lock
Price for both: $312.10

One of these items ships sooner than the other.

Buy the selected items together

Product Description

CriticalCycles City bicycles are hand built for the commuter lifestyle with a lightweight tig-welded steel frame and an advanced component set that is ideal for riding around town, on the beach boardwalk, and for exercise. The Diamond frame is designed for an ergonic and upright riding position for all kinds of urban riding. The steel tubing and progressive frame geometry are designed for a comfortable riding position and a softer ride than your typical city bike.

Incredible Components

Shimano 7-Speed Drivetrain is perfect for longer distance riding as well as easier pedaling on hills. For your convenience the Shimano Revo shifting mechanism is controlled via a grip-twister that allows you to shift gears without sacrificing control of the handlebars. Standard on each bike are Kenda Kwest Tires, the perfect hybrid/touring tire designed with smooth rounded tread with large water dispersion grooves. Many upgrades are also included such as front and rear fenders, vintage-style bullet headlamp (batteries not included), a mid-century bell, rear rack, and sealed bottom bracket. Upright handlebars will keep your eyes on the road while being easier on your back.

What is a Hybrid?

Hybrid Bicycles blends the features of more specialized bikes like road bikes, touring bikes, mountain bikes, and cruiser bikes to produce a user-friendly bicycle that fills general purposed such as commuting. They are some of the most popular bikes simply because they are comfortable, stable, and and easy to use for beginner cyclists, casual riders, and urban commuters. These hybrid bikes are designed for a happy medium between comfort and fitness.

Many Options

Diamond Seven-Speed City Bikes are available in Cream, Black, and British Racing Green. All three colors are available in two sizes: Small/Medium is recommended for riders 5'9 and under, while the Medium/Large is recommended if you are 5'10+. If you are in between sizes, we recommend going with the smaller size.

CriticalCycles is the premier commuter bicycle company with elegant design, artisan-built lightweight and durable frame, and factory direct prices.

Critical Cycles bikes are built to last with brand-name components. No matter if you use your hybrid City Bike to commute to the office, or for recreation and exercise, we've got you covered. Though our bikes offer a smooth and reliable ride above all, our bikes come in a wide variety of bold color combinations that will allow you to express yourself as a rider. Critical Cycles City Bikes can get you the look of a customized bike without the custom price tag. We want to see you get out of your car, out of your cubicle, off the sofa, and onto a Critical Cycles bicycle. Buying a bike has never been easier or more inexpensive! Each bike includes the tools you need to attach your front wheel, pedals, handle bars, and saddle in 20 minutes or less.

Critical Cycles
  • Assembly: We assemble the bike for you 90% so your first ride is shortly after it arrives at your front door
  • Included Accessories: Chain guard, Center Mount Kickstand, Classic Bell, Vintage Style Bullet Head Lamp, Fenders, Tools
  • Frame: Lightweight Hand-Built Diamond High-Tensile Strength Steel Frame with Rack and Fender Braze-Ons
  • Fork: Lightweight Hand-Built Classic Urban Fork
  • Bottom Bracket: Neco Sealed Cartridge Bearing 110.5mm
  • Headset: Neco 1-1/8” Steel
  • Handle-Bar: Alloy Riser City Bars 620mm, 60mm rise, 15° sweep, 25.4 Center
  • Stem: Alloy 30 Degrees Rise, 220mm, 25.4 Clamp
  • Grips: Extra-Soft Brown Rubber
  • Shifter: Shimano 7-speed Revoshift Grip-Twist Shifter
  • Brake & Lever: Alloy Dual Caliper Brake & Alloy Four Finger Lever
  • Rims: 700c Stars Deep-V Double-Wall Alloy Rim 30mm 32H w/ machined sidewall
  • Front Hub: KT 100mm spacing, 32H
  • Rear Hub: KT 135mm spacing, 32H
  • Derailleur: Shimano TX35
  • Tires: Kenda Kwest 700 x 35c
  • Tubes: Kenda 700 x 35c, Schrader Valve
  • Crank: Protek Alloy 170mm, 44T Chainring
  • Chain: KMC Z410, 1/2" 1/8"
  • Seat Post: Alloy 25.4 x 300mm
  • Seat Clamp: Alloy 28.6
  • Saddle: Synthetic Leather
  • Pedal: Urban Pedal Alloy 9/16"

Sizing Chart






Frame Size



Suggested Height





Seat Tube Length

50 cm

55 cm

Seat Tube Angle



Head Tube Length

15 cm

15 cm

Head Angle



Effective Top Tube



Chainstay Length

43.6 cm

43.6 cm


108 cm

108 cm

Front DropOut

102 cm

102 cm

Rear DropOutt

135 cm

135 cm

Product Details

  • Shipping Information: View shipping rates and policies
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Item model number: D7S-1010-55-PARENT
  • Average Customer Review: 3.1 out of 5 stars  See all reviews (50 customer reviews)
  • Amazon Best Sellers Rank: #159,674 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Reviews

That said, this bike has solid components.
Alicia M Guth
I called customer service because this is just getting ridiculous but they were unapologetic and took no responsibility for the bikes defects.
Had to take to bike shop for many adjustments.

Most Helpful Customer Reviews

23 of 24 people found the following review helpful By Don Gale on May 20, 2013
Color Name: CreamSize Name: 50cm/Small Verified Purchase
This review is for the Critical Urban Commuter 7-speed.

I got my Critical in April. I've ridden about 60 miles on both paved trails and city streets. Overall, I'm very happy with it. It's a great beginner bike. A few Pros/Cons, in no particular order:

Pro: Value - The price point on this bike ($300) is what attracted me. I shopped around my local bike stores. To get a basic road bike (without a rack, headlamp, or fenders) would cost $550-650 at most shops. With those extras, it's quite the deal. Quality might be a step down from a Giant or Trek, but it's probably not far off. You can get a cheaper bike at Wal-Mart or Target, I'm sure, but the quality won't be as good. If you're considering the bike, do factor in $50 or so for your local bike mechanic to tune it up before riding.

Pro: Shipping/assembly - I got everything out of the box fine, and nothing seemed missing or broken. I didn't have any instructions, and I couldn't find any online. I emailed Critical customer service and they sent me an assembly PDF within 30 minutes. It took me probably 40 minutes to put together. As recommended, I took it to a local bike shop to get it checked out. They straightened the tires, fixed the kickstand, set the handlebars and seat, and tuned up the brakes and derailleurs. After that, it was perfect.

Con: Adding accessories - There are no holes in the frame for bottle cages, frame pumps, etc, so you have to spend more money on clamps or Velcro when adding those things. The pedals don't have holes for toe clips. I wanted to add some clips as a cheaper alternative to clipless pedals/shoes. My options now are to either buy straps only, new pedals and clips, or new clipless pedals and shoes. Either way, it's more money than I was planning on.
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16 of 17 people found the following review helpful By Shannon on July 28, 2013
This bike was a lot more difficult to assemble than advertised and no instructions were included in the box. I was unable to get the handlebars in, the seat was missing a screw and the fender was far too close to the back wheel to the point where it wouldn't turn. I brought it to a bike shop that was able to put in the handlebars and replace the missing screw on the seat but were unable to fix the back fender. ($60 tune up charge) I contacted the company and they sent me a replacement fender. Great. Or so I thought.

After taking apart the back of the bike to get the fender off the last screw near the pedals was completely stripped (please note this is BEFORE I attempted to unscrew it at all) After trying for over an hour with various screwdrivers and pliers I was unable to take that last screw out and I had to return it to a bike shop and they had to drill the screw out. The new fender was also not a perfect fit and they had to add an extra washer to push the fender further back on the wheel. This was not a simple repair and not something I would have been able to do at home. ($25 more in repairs) I am hopeful that this will be the final repair necessary on this brand new bike but it is very discouraging that after spending $300 on a bike I had to put in an additional $85 in repairs to make it rideable.

*Important Edit*

One large pothole and the new fender is now also knocked out of place. I called customer service because this is just getting ridiculous but they were unapologetic and took no responsibility for the bikes defects. Overall I would not recommend this bike to any of my friends.
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The manufacturer commented on this review(What's this?)
March 20, 2014
Shannon, we're so sorry you've encountered such frustrating problems. Our instructions are available for download on each product page of our website (we're trying to minimize our carbon footprint by avoiding printing out instructions). Unfortunately because we don't have control over freight companies, we can't control how our boxes are treated, which means pieces like screws could fly out if the box is mishandled. We're especially sorry you've had so much trouble with the fenders. We want to make it right with you and we want you to enjoy your bicycle as much as we do. Please contact us at to get everything sorted.
The manufacturer commented on the review below
22 of 27 people found the following review helpful By John Schaefer on April 24, 2013
Color Name: CreamSize Name: 55cm/Large Verified Purchase
1. Both pedal cones were much too tight, so they didn't rotate freely. They're adjustable by prying out the black plastic cap if you have the right metric socket, but you have to know to set them about .010" too loose by feel so that when you re-tighten the locknut the clearance is just right.

2. Someone else said here that their bike came with the derailleur adjusted just right. Mine was way out of whack...which turned out to be because the frame tab that the derailleur mounts to was bent about 5 degrees off the correct angle to the bike axis. Fortunately (I guess) the low-strength steel used for the frame allowed the tab to easily be bent to the right angle. Then I had to reset all three setup screws and the cable length trim. This is kind of an exotic thing to be wrong with a brand new bike.

3. Both wheels are out of true...about a sixteenth of an inch in roundness and another sixteenth of an inch in flatness. I'd expect a factory-new bike's wheels to have been built in an indicator-jig so that they'd be almost exactly flat and round.

4. One frame mount for the front brakes is welded to the fork several degrees out of place around the tube, compared to the other the pads don't hit the wheel at the same angle, even after brake adjustment. (Which they totally needed, out of the box.) Unfortunately this frame situation is unfixable. It doesn't make the bike unrideable, but it's aggravating because the brakes have to be set substantially farther from the rim to avoid rubbing, due to the combination of the goofy pad angle and the out-of-flatness wheels.

5. I wanted to remove the rear fender to try to fix a shipping dent. Oops, the recess of the bottom Phillips-head mounting screw was stripped out.
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The manufacturer commented on this review(What's this?)
July 21, 2013
John, please see our comments about some of the points you have discussed. Many of the speculations you make about this bike are not accurate, while other points have more to do with your preference than the quality of the bicycle.

1- The loose ball bearing pedals are ideal for the casual city rider, and the stiffness you describe may have been specific to the set of pedals you received, or otherwise would be unnoticeable to the feet of most riders. It seems like you have a more acute taste for industrial mechanics than our average rider.

2, 3, 4 - The Derailleur, Wheels, Mounts are all checked and/or adjusted and/or configured during the manufacturing, pre-assemply, and packaging. It's not uncommon for these parts to slightly shift when the bike is shipped, and we recommend getting a bike checked out by a mechanic at your local bike shop or sporting goods store for this reason. Since the time of your review we have identified ways to improve our packaging so that the product is less vulnerable to any impact that occurs during shipping. Any customers that feel they received a bike that is not in "brand new condition" can contact us and we will do the best we can to take care of them.

5 - The philips head screw on the fenders would have only been stripped out if the wrong tool was used on them in the customer's assembly/disassembly process.

6 - The fenders have a tiny fold at the ends to protect the rider from scratching or cutting themselves on a rough or jagged edge. We are not sure why this would be viewed as a problem by you. Many of our customers ride their bike wearing shorts or skirts and occasionally brush their leg against the bike parts while riding or getting on/off the bike. We are very proud of the fold on our fenders as an important safety feature of the bike.

7 - We are the manufacturer with our own proprietary techniques and facilities for producing high quality bicycles. The bottom bracket (which is the correct name of the part you are referring to) is a sealed cartridge bottom bracket meaning there is no opening for crud to get in to the mechanical bearings. There is simply no need to be concerned about the "seal" of the bottom bracket.

8 - The kickstand is on the side of the bike and could have been slightly bent if other boxes were stacked on top of it during shipping. An easy fix for this would be to set the kick stand and apply weight down on the seat of the bike to bend the kickstand back into position. This is the same way a bike mechanic in a repair shop fixes a kick stand that appears to be too long.

9 - 90% of bicycles sold in the US are made in China (according to NBDA), and 90% of those bikes use paint from the same supplier called YS Paint. The paint we use is the same, and it is standard amongst almost all bikes imported the US. However, what we do differently as a manufacturer is a twelve step painting process that involves manually degreasing and preparing a raw frame, primer, painting, clear coating, etc that will ensure the paint will stick to the bike, and be protected from scratches. We are confident that there is no other manufacturer in the <$300 bike market that has such an extensive paint process for their bikes, and we take a lot of pride in our handsome and high quality finishes. It's simply unrealistic to expect a $300 bike to have the same quality paint as a car, but we do the best we can.

We hope our comments will help address some of your concerns, and if you have any further comments or concerns please don't hesitate to contact us. Our contact info is listed below. It would be our pleasure to be of service to you.

Phone: (888) 488-2369

Most Recent Customer Reviews