Dirty Sixer Allroad 2 5XL Review: A Serious Bike Built for Riders Over Seven Feet

Introduction

Most production road bikes top out somewhere around a 62 cm frame, and even those are aimed at riders a little over two metres tall. The Dirty Sixer Allroad 2 5XL starts where those bikes stop. Its seat tube measures 62 cm on its own, but the top tube stretches to 75 cm, and the wheels measure 36 inches in diameter rather than the 29 inches most riders are used to. Set beside a typical size 49 road bike with its 51 cm top tube and 46 cm seat tube, the difference stops being a matter of degree and becomes a matter of category.

That scale is deliberate. Dirty Sixer builds this bike for people roughly 7’1” to 7’5” tall, a group that has historically had almost nothing off the shelf to ride. The result is not a stretched version of a normal frame with awkward proportions bolted on. It reads like an ordinary modern allroad bike, just rendered at a size that finally matches the rider.

Who This Bike Is For

The Allroad 2 5XL is aimed squarely at very tall riders, which is not a small niche if you happen to be in it. Anyone between roughly 7’1” and 7’5” will find that the cockpit, the crank length and the wheelbase actually line up with their body rather than forcing them into a compromised position on a frame that was never designed for them.

It is also built with weight in mind. The frame is rated to carry up to 180 kg, which makes it relevant for heavier riders who find that standard frames and wheelsets feel flexy or come with restrictive load limits. The oversized wheels and the dual front rotor setup exist partly for that reason.

Main Strengths

The clearest strength is proportion. Nothing about this bike looks improvised. The component choices scale with the frame, and the geometry has clearly been worked out around the rider it serves rather than adapted from a smaller platform.

Wheel size matters more than it might sound. The 36-inch wheels wrapped in 57 mm tyres put the contact patch and the rollover behaviour in a different place from a standard 700c setup, which gives the bike a steadier, more planted character on imperfect surfaces. For a tall rider, that combination of a long wheelbase and big rubber translates into a confidence that smaller bikes cannot really replicate.

The smaller details follow the same logic. The handlebar diameter is noticeably larger than standard, which suits riders with genuinely large hands, and the whole build has the feel of something assembled around a specific set of bodies rather than around the middle of a bell curve.

Frame, Wheels, and Weight

The Allroad 2 5XL uses an alloy frame paired with steel forks, and it weighs around 15 kg complete. That is heavy next to a full carbon race bike, but it is a reasonable number for a machine of this scale, and the frame material choice keeps the cost and the durability trade-off in a sensible place for a bike that is expected to carry substantial load.

Crank length is 200 mm, which is a long arm by any standard and reflects the leg length the bike is designed around. The wheels measure 36 inches in diameter with 57 mm tyres, so the bike sits noticeably taller than anything in a normal shop. Storage, transport and doorways become practical questions rather than afterthoughts.

The stopping hardware is where the build gets interesting. The bike runs disc brakes with 203 mm rotors, and the front wheel carries two of them, a configuration the manufacturer says is there to handle heavier riders.

Braking and Control on the Road

That dual front rotor setup earns its place out on the road. Riders who have spent time on this bike describe a level of stopping control that stands out immediately, with the bike shedding speed in a straight, composed line rather than feeling like it is running out from under you. The large tyres add traction on top of that, so the braking force has something to work against.

It is easy to see why the design question gets raised: if two rotors and 203 mm discs can rein in a bike carrying a 180 kg rider, there is a fair argument that wider use of dual front rotors on ordinary bikes is worth considering. On this bike it does not feel like excess. It feels proportionate.

Things to Consider Before Buying

Size is the first consideration, and it cuts both ways. The bike is enormous, and a rider of average height will find mounting it a genuine challenge, with the saddle far out of reach and the pedals a long way down. That is not a fault in the design, it is the point of the design, but it does mean this bike only makes sense for the riders it was built for.

The 15 kg weight is worth going in with clear eyes. On climbs, a build of this mass asks more of the rider, particularly compared with a light carbon road bike. The trade-off is stability and carrying capacity rather than speed on an incline.

Practical logistics deserve a mention too. A 36-inch wheel bike takes up space, needs somewhere to live, and will not slot into a standard car rack without planning. It also draws constant attention, which is either a feature or a mild inconvenience depending on your preference.

Buying Advice

If you are between roughly 7’1” and 7’5”, the Allroad 2 5XL is one of the very few production bikes that will fit you properly, and the thought put into the details makes it a genuinely reasonable purchase rather than a novelty. The 180 kg capacity and the dual front rotor braking give it a safety margin that most large riders have never had access to.

If you are not in that height range, there is little reason to buy one, and that is fine. This is a specialist machine with a clearly defined rider in mind.

Before committing, think through where the bike will be stored and how it will be transported, and be honest about how much climbing you do. If those answers work for you, this is a bike that finally treats your size as a design brief rather than a problem to work around.

Conclusion

The Dirty Sixer Allroad 2 5XL is a rare thing: a well-considered bike built for riders that the industry has largely ignored. The 36-inch wheels, 75 cm top tube, 200 mm cranks, dual front rotors and 180 kg capacity all point in one direction, and that is a machine that fits a very tall or very heavy rider properly instead of approximately. For the right rider, the fact that it exists at all is the strongest argument for it.