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GMC Topkick Dual-Suspension Mountain Bike Shimano 21-speed index gearing; Dual suspension with 4 bar linkage system; Suspension fork with 90mm travel
Customer Review: Great bike for most users
I purchased this bike because the price was great and it came with dual suspension and front/rear disc brakes. The only problem with the bike is that beginner tuners will have a hard time getting the brakes right as well as the gearing. I paid a shop to get it all right for me, the bike works perfect now.

Azonic B52 Downhill and Freeride Dual Suspension Mountain Bike Frame The 2007 version of the Azonic B52 Downhill/Freeride frame is made of aircraft-quality 6061 aluminum tubing. The Horst Link suspension is fully active under both pedaling and braking, which helps prevent brake jack. It also features a replaceable derailleur hanger, a heavy-duty sealed cartridge bearing 4 bar linkage, and a Marzocchi Roco World cup rear shock with easily adjustable geometry.

2007 K2 Lithium 3.0 For 2007 K2’s Lithium series delivers serious all mountain performance with a price that’ll help make those trips to your mountain bike mecca a reality. An all mountain 4 bar linkage and a stable platform suspension package combined with a great parts package make this ride a huge step up in performance.

Azonic B52 Downhill and Freeride Dual Suspension Mountain Bike Frame The 2007 version of the Azonic B52 Downhill/Freeride frame is made of aircraft-quality 6061 aluminum tubing. The Horst Link suspension is fully active under both pedaling and braking, which helps prevent brake jack. It also features a replaceable derailleur hanger, a heavy-duty sealed cartridge bearing 4 bar linkage, and a Marzocchi Roco World cup rear shock with easily adjustable geometry.

Azonic B52 Downhill and Freeride Dual Suspension Mountain Bike Frame The 2007 version of the Azonic B52 Downhill/Freeride frame is made of aircraft-quality 6061 aluminum tubing. The Horst Link suspension is fully active under both pedaling and braking, which helps prevent brake jack. It also features a replaceable derailleur hanger, a heavy-duty sealed cartridge bearing 4 bar linkage, and a Marzocchi Roco World cup rear shock with easily adjustable geometry.

Mongoose Pro Wing Comp Dual Suspension Mountain Bike The Mongoose Pro Wing Comp 26-Inch Mountain Bike has a dual suspension 7005 alloy main frame with a steel rear triangle and features a four-bar linkage design with cartridge bearings in six main pivot points. It is equipped with a front suspension fork with 70 millimeters of travel and an RST-22 rear coil shock. It has a suntour cold-forged alloy crankset and True Technologies handlebar and stem. Its 24-speed gear set is navigated with Shimano EF-29 easy-fire shifters and Shimano C-050 front and Altus rear derailleurs. The bike has a Speed V sport saddle and Kenda Koyote tires with GSW 32H rims, suitable for riding on trails and mountain terrain.

Specifications:

• Fork: Spinner Grind 1, 70 mm
• Rear Shock: RST-22
• Crankset: RPM cold forged alloy, 42/34/24T
• Bottom Bracket: Semi cartridge
• Pedals: Alloy Platform with Mongoose logo
• Front Derailleur: Shimano C050
• Rear Derailleur: Shimano Altus
• Shifters: Shimano EF-29 EZ Fire
• Freewheel: Sunrace CSM62 11-34t 7sp
• Chain: KMC Z-51
• Rims: Alex SCE17 with GSW 32H
• Tires: Kenda Koyote 26×1.95
• Front Hub: Alloy Q/R with Mongoose logo 32H
• Rear Hub: Alloy Q/R with Mongoose logo 32H
• Spokes: Stainless steel
• Front Brake: ProMax linear pull
• Rear Brake: ProMax linear pull
• Brake Levers: Shimano EF-29
• Handlebar: True Technologies Steel 30mm rise
• Stem: True Technologies Alloy Ahead
• Grips: Mongoose Pro logo grip
• Headset: 1 1/8 Zero stack steel cups
• Saddle: WTB Speed V Sport
• Seat Post: Alloy with integral head 300mm length
• Seat Clamp: Alloy Q/R

Assembly of the Bike:
This bike comes mostly assembled. Minor assembly is required before the bike can be used.

Amazon.com Bicycle Buying Guide
Finding the Right Bike
To really enjoy cycling, it’s important to find a bicycle that works for you. Here are some things to keep in mind when you’re in the market for a new bike:

The Right Ride
In general, bikes are broken down into three major categories:

• Road and Racing Bikes–As a general rule, road and racing are built for speed and longer distances on paved surfaces. Thinner tires, lightweight 29-inch (700c) wheels and drop bars that allow for a more aerodynamic position are the norm. Most road bikes, regardless of price, offer many gears for tackling both hilly and flat terrain.
• Mountain Bikes–With their larger tires, hill-friendly gearing and upright position, mountain bikes are very popular for all types of riding, both on pavement and off. Mountain bikes that are designed specifically for rugged trail use typically feature a suspension fork. Some may have rear suspension, as well. A quick change of the tires on any mountain bike–even one that you use regularly on trails–adds to its versatility and makes it a worthy street machine.
• Comfort/Cruiser Bikes–For tooling around on bike paths, light trails, or for cruising a quiet beach-side lane, comfort/cruiser bikes are the ticket. With a super-relaxed riding position, padded seats, and limited or no gearing, these bikes are made for enjoying the scenery and having fun with the family.

The Right Price
A bike’s price boils down to three essentials: frame materials, bike weight, and component quality and durability.

• Entry-level–You’ll find a wide range of comfort and cruiser bikes in this category, as well as some lower-end mountain bikes and road bikes. Most will have steel frames and components that are designed to last for several years with frequent use.
• Mid-range–Bikes in this range may feature a lighter aluminum frame with mid-range components that keep performing after miles of use. If you’re looking for a quality bike that is relatively lightweight and will stand up to abuse, this is the “sweet spot.” Most serious commuter and touring bikes fall into this category, as do mid-range mountain bikes with a decent front suspension.
• High-end–Racers and serious enthusiasts who expect lightweight, high-performance components will want to stick to this category. For road bikes, exotic frame materials (carbon fiber, titanium) and ultra-lightweight components can add thousands to the price tag. Mountain bikes in this class often feature advanced front and rear suspension technology, as well as components designed to handle lots of rugged trail action.

The Right Size
Fit is crucial for comfort, control, and proper power and endurance on a bike. Here are some basic bike fit tips:

• Stand-over Height–To find out if a bike’s overall height fits your body, measure your inseam. Next, determine how much clearance you’ll need between your crotch and the top tube of the bike. For a mountain bike, you’ll want three to five inches of clearance. A road bike should offer between one and two inches of clearance, while a commuter bike should have two to four inches. Compare the stand-over height for a given bike to your measurements (inseam + clearance) to determine the right bike height.
• Top Tube Length–You can measure your torso to get a good estimate of proper top tube length. First, make a fist and extend your arm. Measure from the center of your fist to the end of your collarbone (the part that intersects your shoulder). Next, measure your torso by placing a book against your crotch with the spine facing up. Measure from the spine to the bottom of your throat (the spot between your collarbones). Finally, add the two measurements (arm length + torso length), divide the number in half and subtract six inches. This is your approximate top tube length. Compare this number to a bike’s posted top tube length. You can allow for about two inches longer or shorter, as most bikes can be adjusted via stem length/height and saddle fore/aft position to make fine adjustments to the fit.
• Bikes for Women–Proportionally, women tend to have a shorter torso and longer legs than men. Bike makers design women’s bikes that offer a shorter top tube and many comfort/cruiser bikes built for women may also provide more stand-over clearance.

The Right Accessories
When you make a bike purchase, don’t forget these crucial add-ons:

• Helmet (this is a must!)
• Seat pack
• Lock
• Hydration pack, or water bottles and bottle cages
• Spare tubes
• Portable bike pump
• Gloves

Customer Review: Disappointed
One of the main reasons I chose this bike (and thought I was paying a little extra) was because it was advertised with 24 speeds, which I wanted for the hilly gravel roads we have here. Once I had it all assembled, I realized it only has 21 speeds. Assembly takes about an hour to unpack, inflate tires, mount front tire, attach handle bar, attach & adjust seat, and attach pedals. A tune-up would take several hours more as the brakes, the wobble in the front wheel, and both derailleurs need adjusting at the very least. For this I recommend the book Bicycle Maintenance & Repair (by Bicycling magazine). The documentation provided with the bike is thorough, but really intended for someone with technical knowledge and know-how. The stamped serial number is not legible - half of it’s missing - so it can’t be used for identification purposes if the bike is stolen. The bike appears to be of good average quality, but is not as advertised, and has to be returned.
Customer Review: missing part
everything about the bike was great but……………it came missing a kickstand. now I have to contact the manufacturer and have it sent.