Sum Pro Shimano Dura-Ace Di2

For road riding, the score leans toward outright pace rather than comfort-first priorities. In real riding, it's one of the more speed-focused builds in its group. The score is largely shaped by all-round road tires that balance speed and comfort and a high-end drivetrain that tends to feel crisp under load. From the ingredients, aero efficiency is a major part of the speed feel here.

Overall on climbs: 1.8/10. Within Road bikes, this comes out near the bottom. You may find yourself pushing a bit more on steeper grades. In numbers, the low gear is roughly 32.4 gear inches. In its peer group, it lands around the easier ~18% for low-gear climbing. “Gear inches” sounds nerdy, but it’s just a quick way to describe how easy your lowest gear is to turn uphill. Lower usually means easier. This is happiest on flatter terrain; steep stuff will feel demanding. Build kits can differ by size and spec level, and not every detail is published by every brand, so use this as a practical guideline.

Seen as a race-focused option, with a 7.8/10 aero score, it’s shaped to hold speed once you’re moving quickly so it tends to hold speed efficiently. What that means on the road is: it’s built with speed in mind, with choices that reduce wind drag once you’re riding faster. Its race label helps explain the balance between speed, comfort, and versatility. Rims around 45mm are more of an all-round choice than a pure aero choice. These wheels lean more toward stability and versatility than pure aero. This tyre size generally plays nicely with aero goals compared with very wide all-road tyres. Not every brand publishes the same detail, so this leans on the clearest available specs. In real riding, it tends to reward holding speed: the faster you go, the more the aero design helps.

Sporty fit - more tuck for efficiency, but still manageable for many riders. That's driven by the front end is large, with ~106 mm of saddle-to-bar drop, with a long stretch forward at ~572 mm. Plan for roughly 40 degrees of lean.

In Road / Race, That is why we tag it Moderately Adjustable. This rating is mainly driven by the parts that affect adjustability: Because the bar and stem are separate, changing reach or bar shape is usually straightforward; Cable routing is on the simpler side, which helps adjustability.

This scores 3.0/10 for comfort, so it feels firm out on the road. That’s why it’s labeled Firm. It’s running about 28 mm tires on 700c wheels, and you feel more of the road texture with narrow tires on chipseal and broken pavement. The posture is race-leaning (posture 7/10, torso ~40°), which tends to feel more direct, especially over rougher sections.

This looks like a high asking price for the build level. Value is scored 1–10: higher is better value, lower means you’re paying more than similar bikes. Uses MSRP as a baseline; real-world prices can be lower (discounts can change the value). On the spec comparison, it sits roughly 69% above what similar builds typically cost. Compared with similar bikes, it trends a little expensive (cheaper than about 26% of listings). Quick reference: €10.343 listed versus about €6.136 for a comparable build. Overall, you can likely find better value elsewhere.

This bike is built for smooth pavement and fast road riding. Tires around 28 mm usually mean it’s tuned for smooth-road speed. The wheel setup (700c) supports that direction.