Cube Attain C:62 SLT Review: Endurance Comfort With Shimano Ultegra Di2

Introduction

The Cube Attain C:62 SLT is the most relaxed road bike in Cube’s range. It is a full carbon endurance machine built around a Shimano Ultegra Di2 12-speed group set, with a claimed weight under 8 kg. Cube’s own description of the concept is race bike performance with touring bike comfort, and the £3,099 price tag is the detail that makes people look twice: the Ultegra Di2 group set alone carries an RRP of £2,328.

That number sets the tone for the whole bike. You are paying a little more than the group set costs on its own and getting a carbon frame, a carbon fork and a complete set of finishing parts around it.

The paint is worth a mention before anything else. Depending on the angle and the light, the finish reads somewhere between purple and blue, and it shifts as you walk around the bike. It is a striking, deep finish that stands out without being loud.

Who this product is for

This is an endurance road bike, so the fit and the ride position are the headline. If you want a bike that stays comfortable deep into a long ride but still feels quick when you push on the pedals, the Attain C:62 SLT is aimed squarely at you.

It also has room for tyres up to 34mm, which opens up rougher back lanes and light gravel without changing bikes. Cube adds extra mounting points for accessories from Acid, including a frame bag that fixes to two mounts inside the front triangle and a matching saddle bag. That makes it a practical option for long days out where you want to carry food, tools and a layer without stuffing everything into jersey pockets.

It is less suited to riders chasing a low, aggressive race position, and it is not a dedicated bikepacking platform.

Main strengths

The frame and fork are carbon, and Cube has shaped the rear of the bike with comfort in mind. The seat stays are very slim, and the company says this design delivers all-day comfort regardless of the road surface underneath you. The seat tube is deliberately slim as well, so it can flex as the rear wheel passes over bumps and take the edge off rough tarmac.

The details around the frame follow the same logic. The handlebar is carbon, and the saddle is a short-nosed Newance Pro, a shape that has become popular because it supports an upright, sustainable position. Cube also kept the seat post to a standard 27.2mm round profile. That is increasingly rare on modern road bikes, and it is a genuine plus: if you want a different post or a different amount of compliance, swapping it is straightforward.

What stands out most is how few compromises there are in the component list. Nothing here feels like it was chosen purely to hit a price.

Geometry and ride character

Endurance geometry is the reason this bike behaves the way it does. The head tube is taller, which means you can run the stem lower with fewer spacers and still sit in a comfortable position. The wheelbase is slightly longer than a race bike, and the fork carries more trail, so the front wheel sits further ahead of you. The result is a bike that is less twitchy and more stable, which matters when you are tired or riding in a group.

Cube has also spent time on aerodynamic development, but you will not find extreme tube shapes here. The tubes stay relatively round and shallow. That is intentional: very deep profiles flex less and absorb less vibration, which works against comfort. Classic round tubes are comfortable for exactly that reason, and the Attain follows that principle.

Components and specification

The wheels are Newman Advanced A50 carbon items, 50mm deep. That depth is a sensible middle ground for most riders in most conditions, and a modern U-shaped 50mm rim is stable enough to ride almost anywhere. Internal width matters more than depth when you are choosing wheels, and 21mm is the figure to look for at minimum. There is also a useful guideline for pairing rims and tyres: the external rim width should be about 105% of the measured tyre width.

Cube has paired those wheels with 30mm Continental Grand Prix 5000 STR tyres. That is a performance tyre at the top of Continental’s road range, and putting it on a bike at this price is a meaningful choice rather than a cost-cutting one. It is also the right width for this kind of bike, where 28mm, 30mm or 32mm rubber makes far more sense than a narrow tyre on a skinny rim.

The drivetrain is Shimano Ultegra Di2, 12-speed. It is top-tier electronic shifting performance, and the only meaningful step above it is a lighter Dura-Ace group with no real performance advantage.

Up front there is an integrated aero stem with the cables routed through it, which keeps the lines clean and saves a little drag.

Things to consider before buying

There are no bolts on the fork and no top tube storage, so this is a bike with one eye firmly on performance rather than on maximum carrying capacity. If your plans involve multi-day loaded trips, the mounting options are more limited than on a dedicated adventure bike.

The integrated stem and internal cable routing also mean fewer easy adjustments at the front end. That is a common trade-off on modern road bikes, but it is worth knowing before you buy.

The position is relaxed by design. Riders who want a long, low race fit will find the taller head tube and stable front end working against them rather than for them.

Buying advice

The value case here is simple. You get a carbon frame and fork, Shimano Ultegra Di2 12-speed, 50mm carbon wheels and 30mm Continental Grand Prix 5000 STR tyres for £3,099, a price that sits only a little above the £2,328 RRP of the group set by itself. That is top-tier shifting performance without world-tour bike pricing, and it is the main reason this bike is worth a serious look.

Before ordering, focus on two things: fit and tyre plans. Sit on the geometry, or have it checked against a bike you already ride comfortably, because the endurance position is the whole point of the Attain. Then decide whether you want to run the stock 30mm tyres or move to something wider, since there is clearance up to 34mm. If you plan to use the Acid frame and saddle bags, confirm the mounting points on your chosen size line up with the accessories you want.

Conclusion

The Cube Attain C:62 SLT does exactly what an endurance road bike should do. It pairs a comfortable, stable, flex-tuned carbon frame with a specification list that most brands would reserve for far more expensive machines, and it does so with a paint finish that looks genuinely special in the sun.

For riders who want one fast, comfortable bike for long road days and mixed surfaces, with electronic shifting and carbon wheels already fitted, this is a rare case where the price and the parts list tell the same story.