Spezia Dura-Ace Di2 12 Speed

This road speed rating is tuned for paved riding - think steady fast tempo and easier acceleration. Compared with bikes built for pure pace, this build is 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.

How it climbs: 2.3/10. Within Road bikes, it lands below average. You may find yourself pushing a bit more on steeper grades. In numbers, the low gear is roughly 30.6 gear inches. In its peer group, it lands around the easier ~32% for low-gear climbing. We use “gear inches” as a shortcut for climbing gearing. Lower numbers mean you can spin more easily when it gets steep. A good middle-ground if you want mixed routes that include some hills. Different builds can shift the feel a bit, and some manufacturer specs aren’t always publicly listed, so consider this a helpful direction.

From a race-focused perspective, that 7.1/10 aero rating suggests that with tyres around 30mm, it aims for usable speed without big trade-offs without demanding big compromises elsewhere. The short version is: it’s a balanced middle ground: some streamlining, but not an extreme aero setup. Tyres around 30mm are a practical middle ground, with a small aero trade-off compared with narrower race tyres. It’s a middle-ground feel: not the fastest possible in the wind, but not holding you back either.

Sporty fit - a performance-leaning position that encourages speed. Race-focused geometry usually rewards a more tucked posture. Mostly geometry-based, with a small category-based estimate.

A modular front-end gives more freedom to change stem length or bar width, Routing is relatively straightforward, which helps when you change cockpit parts - Seatpost info looks fairly neutral, so most fit change comes from cockpit choices. That is why it is in the Adjustable bucket.

Comfort comes out to 3.5/10, which usually translates to a firm ride. That’s the reason it lands as Firm. It’s running about 30 mm tires on 700c wheels, and it softens the edges a little, without feeling plush on chipseal and broken pavement. The posture is race-leaning (posture 7/10), which puts more weight forward, so you notice more feedback through the hands and saddle.

This bike is best when your rides stay on clean tarmac. Tires around 30 mm usually mean it’s tuned for smooth-road speed. Overall, the setup matches this surface range well.