Mafia Chonky 27.5 Inch Wheelie Bike

Stock Arriving Soon

Ever since Mafia started making cruisers designed for wheelies, customers have begged them to design and manufacture a fat Bike. It’s taken over 2 years of meticulous design, prototyping, and testing to perfect the “CHONKY”.... Read More

Ever since Mafia started making cruisers designed for wheelies, customers have begged them to design and manufacture a fat Bike. It’s taken over 2 years of meticulous design, prototyping and testing to perfect the “CHONKY”.

The result is a class-leading machine that’s lightweight, high spec, with strength and durability in all the right places.

Featuring their own hydroformed tubing (not to be found on any other brands), the frame looks totally sick with carefully selected geometry, smooth lines and ultra-fine detailing. You will not find a more unique, cleaner looking fat cruiser on the market with so much attention to detail.

The first bikes will feature VEE 3.0” tyres but later production runs will come with our upcoming new SNAKESKIN 3.0 wheelie specific tyres (later In 2022). The forks and bars are constructed from 4130 Chromoly and are designed to look clean and take a beating. The rims are wide and double skinned and the cranks are 2 - piece hollow tech with a 6061 T6 CNC alloy chainring.

Of course, Mafia’s signature wheelie seat is included along with their forged top load alloy stem. The Rear wheel control and stopping power is courtesy of a Zoom hydraulic disk brake. Thanks to the fully sealed construction, the ride is as smooth as it gets. Mafia know what geometry works for you to get the best out of a cruiser, so you can rest assured knowing this bike will work straight out of the box.

Wanna be the best?? Then you need the best bike and CHONKY is hands down the best fat Bike money can buy...


  • 6061 T6 Aluminium Frame
  • Complete With Front & Rear Disc Brakes
  • Sealed Bearings Throughout
  • Samox 24MM Hollowtec Cranks
  • Chromoly Forks & Handlebars
  • Vee Speedster Tyres 27.5” X 3.0”



  • 6061 T6 Aluminium
  • External Seat Clamp
  • ISO Threaded Bottom Bracket
  • CNC headtube
  • Tapered chain/seat stays
  • Ø31.6mm Seatpost


  • 4130 Chromoly
  • Internally threaded
  • CNC compression cap
  • Taper blades w/ peg recesses
  • Handlebars: High Tensile
  • Headset: 1 1/8” Sealed Integrated Bearings
  • Stem: Mafiabikes Forged Topload
  • Grips: Mafiabikes Lucky 6
  • Pedals: 9/16” Mafiabikes Plastic
  • Saddle: Mafiabike Railed Wheelie Seat
  • Brake: Zoom Hydraulic Rear Brake 160mm
  • Front Hub: 3/8” Chromoly Heat Treated Quick Release Axle W/Sealed Bearings, Disc Hub
  • Rear Hub: 3/8” Chromoly Heat Treated Axle W/Fully Sealed Bearings, 12t Cassette
  • Sprocket: 25t Direct Mount CNC 6061 Alloy
  • Rims: Wide Double Wall Alloy
  • Cranks: Samox 170mm Forged Alloy Cranks With 24mm Hollow Spindle
  • Tyres: Vee Speedster 27.5”X3.0”
  • Headtube: 1 1/8” Sealed Integrated Bearings
  • Seat Clamp: Ø35mm External
  • Chain: KMC 1/2" X 1/8"
  • Gearing: 25/12T
  • Chainring/Sprocket: 25T Direct Mount CNC Steel



  • Top Tube Length: 23.8”
  • Chain Stay Length: 17.4”
  • Head Tube Angle: 70°
  • Seat Tube Angle: 72°
  • Stand Over: 26.7”

Handle Bars:

  • Width: 30”
  • Rise: 6”


  • 22mm Offset
  • Lead Time: 0
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New Rider?

Choosing the correct bike for your discipline is extremely important, and sometimes for those new to the sport it can be difficult to know or decide, so we’ve broken down the main differences to help you make a decision. 

Freestyle bikes are designed for the skatepark, the streets or the trails.  They are constructed from strong, hard wearing materials and usually feature Steel or Chromoly frames.  This means that the bike can stand up to a certain amount of impacts and hard landings, but remember no bike is indestructible.  For riders looking to learn tricks and stunts, then a freestyle bike is the correct choice.

Race bikes are designed specifically with the track in mind, they are nimble lightweight machines for putting down quick lap times.  Typically, they are constructed from lightweight materials like aluminium and carbon fibre to keep the weight down and the rider at the front of the pack.  These bikes are strong enough for smooth landings on race and pump tracks but will not take the abuse that a freestyle bike would in concrete skateparks.  If you’re looking to set fast lap times or begin your competitive career on the track, a race bike is the right choice. 


Choosing the correct size BMX bike is very important, bikes that are too large will be cumbersome and hard to manoeuvre and bikes that are too small can feel cramped and hard to keep under control.  

Youth freestyle bikes are sized depending on the diameter of the wheel staring at 12” all the way through to 18”, at a 20” wheel the bike is considered an adult size.  Adult freestyle bikes are sized on top tube length, a 18.5” top tube is extra small for younger teenagers who have just moved up to an adult bike, a 20” top tube is small, 20.5” a medium and anything over a 21” is considered large.

Race bikes feature 20-inch wheels on all models, but the components and frame are sized dependent on age and height.  Youth race bikes start from a Micro size for very young riders and offer a range of sizes through to expert XL.  Pro size and upwards are considered adult bikes and are usually offered up to a Pro XXXL or larger for very tall riders. 

We recommend consulting our height charts from the link below to help you choose your perfect sized bike:




Choosing the right level bike for your riding ability is important.  Components that are not suitable for your level of riding can wear or fail much sooner than expected.  Although BMX bikes can look very similar, under the surface components and materials used can vary greatly. 

All our bikes are cherry picked from the very best BMX specialist brands, and all our bikes are designed specifically for use at the skatepark or on the track. 


For first time riders new to the sport our entry level bikes, priced from £200-£400, are perfect, most of these are made from high tensile steel which means they are still relatively strong, but can be slightly heavier than higher end models.  You might find you’ll want to upgrade to something lighter sooner than you’d think.  If you are planning on using the bike in rain or bad weather, we do strongly advise choosing a model with fully sealed bearings all round. 

If you are already confident on a bike and have some experience in skateparks or performing tricks and jumps then we would recommend choosing a mid-range bike, priced from £400 to £700, with a full Chromoly frame, fork, and bars.  This will be lighter and stronger than an entry level model.

 For an experienced person that is already capable of performing most tricks and has previously owned BMX bikes then a high-end complete bike, or full custom would be suggested to meet the demands of this rider, these bikes are priced from £700 plus. 


Our range of entry level race bikes are perfect for first time racers, usually priced between £200 and £400 most of these are constructed of heavier steel rather than aluminium. These are great to get a feel for the sport but would not be able to keep up in a competitive environment. 

Our mid-range race bikes are the perfect for riders who are beginning their path to competitive racing.  Priced between £400 and £800 these are not quite the high-end steeds you see at national level races, but they all feature lightweight aluminium frames and are designed specifically with the racetrack in mind.

For experienced riders who are already racing confidently at a competitive level we offer a small range of high-end complete bikes.  These are usually priced between £800 and £1500 and feature many aftermarket components like carbon forks, disc brakes and folding tyres.  However, at this level we highly recommend building a full custom bike, usually costing between £1500 and £3000 all components can be chosen specifically with the rider in mind.  For help on building a custom bike give us a call or drop us an email!


One of our most frequently asked questions in freestyle is, which rear hub do I want, a freecoaster or a cassette?  Most experienced riders know their preference, but if you’re new to the sport it can be difficult to know which choice to make. 

The main difference between the two is the way the bike performs when going backwards.  A traditional cassette hub requires the rider to pedal in time with the rotation of the wheel while travelling backwards, while a freecoaster allows the rider to travel backwards while keeping the pedals level in the same position as riding forwards.

Although this may seem like a brilliant feature, it does come at a price!  Freecoaster hubs feature a “Slack” before engagement while pedalling forward.  This means that you can turn the crank a set amount (Usually an adjustable amount) before the drivetrain engages.  This is referred to as the “Slack”, when riding backwards you must keep your feet positioned within the slack, if your pedals rotate too much the drivetrain will engage and your pedals will start to rotate.  The smaller the slack, the harder it is to keep your pedal positioned within it while riding backwards.  This means that certain tricks are harder to perform, especially those that rely on pedal pressure, for example Tire Taps.