Sum Pro Shimano Ultegra Di2

It lands in the middle: capable pace, but not optimized for outright speed. This road-speed measure focuses on efficient pace on asphalt, where drag and rolling resistance matter most. Key drivers include all-round road tires that balance speed and comfort, an aero-leaning setup that reduces drag at higher speeds, and a solid drivetrain that supports efficient riding.

Uphill performance score: 1.8/10. Within Road bikes, this comes out near the bottom. On climbs, the lowest gear feels tall. That lowest gear comes out around 32.4 gear inches. Compared with similar bikes, this low gear is easier than about ~18% of them. “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. Specs can vary by size and build, and some manufacturer details aren’t always published, so treat this as a strong guide rather than a guarantee.

As a race-focused bike, at 7.8/10 for aerodynamics, it’s built to waste less energy pushing air and it’ll feel quicker on open roads. 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. A lower front end can help you tuck in a bit, even if the bike itself isn’t built as an aero specialist. Rims around 45mm are more of an all-round choice than a pure aero choice. That wheel depth is more all-round than purely aero-focused. This tyre size generally plays nicely with aero goals compared with very wide all-road tyres. When you’re riding quickly, this kind of design can feel easier to keep rolling at the same speed.

Sporty fit - a performance-leaning position that encourages speed. You get this posture because handlebar height is roughly 106 mm lower than the saddle (large drop), and how far you'll be stretched forward is about 572 mm (long). Estimated lean is about 40 degrees. Race-focused geometry usually rewards a more tucked posture. Spacer height is roughly 6 mm.

Why this fit flexibility rating: Separate bar and stem components keep fit changes practical - Less routing complexity makes swaps and adjustments more practical. So it lands in Moderately Adjustable. This mainly reflects how easy it is to adjust or swap key fit parts over time.

Comfort comes out to 3.0/10, which usually translates to a more responsive than cushy ride. 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 puts more weight forward, so you notice more feedback through the hands and saddle.

This is priced well above what we’d usually expect for a similar setup. The value score is 1–10. Higher means better value for money; lower means the price is high for what you get. Uses MSRP as a baseline; real-world prices can be lower (discounts can change the value). On the spec comparison, it sits roughly 68% above what similar builds typically cost. Compared with similar bikes, it trends a little expensive (cheaper than about 26% of listings). To anchor it: price €9.136 versus an estimated €5.450 for a similar build. Bottom line: the price looks high for what’s included.

This bike is best when your rides stay on clean tarmac. The tire size is around 28 mm, which is typical for fast road setups. Overall, the setup matches this surface range well.