Gold STC Dura Ace Di2/Zipp Bike Limited Edition

When the riding is smooth, speed comes down to resistance and weight, and that's what this rating emphasizes. The biggest contributors are all-round road tires that balance speed and comfort and a high-end drivetrain that tends to feel crisp under load. Under the hood, aero efficiency is a major part of the speed feel here.

How it climbs: 1.8/10. Within Road bikes, it ranks 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. On the ‘easier low gear’ scale, it sits around ~18% versus similar bikes. Think of “gear inches” like a difficulty score for your easiest gear: lower = more spin-friendly on climbs. 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.

Aero-wise, at 6.8/10, it’s aero-aware without going extreme so it feels versatile, not single-purpose. The short version is: it’s a balanced middle ground: some streamlining, but not an extreme aero setup. Tyres around 28mm fit a faster road setup and usually keep drag in check. A more integrated front end usually reduces minor drag points around the cockpit. That typically means solid everyday speed without forcing an aggressive position or race-only parts.

Comfort fit - a relaxed road posture that stays friendly on longer rides. Mostly geometry-based, with a small category-based estimate.

With a one-piece cockpit, the bike is more fixed in its stock position, and Cable routing is on the simpler side, which helps adjustability. Net result: Limited Adjustment.

Comfort comes out to 4.2/10, which usually translates to a quite direct ride. That’s why it’s labeled Firm. It’s running about 28 mm tires, and narrow tires usually mean higher pressure, so more buzz comes through on chipseal and broken pavement. The posture is neutral (posture 5/10), which keeps things neutral and easy to live with.

This sits in a nice value spot for its category. 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 estimate, the price is close to what we’d expect for a comparable build. In its peer group, it tends to be better-priced than many, beating about 69% of listings. Quick reference: €6.667 listed versus about €6.754 for a comparable build. Overall, it looks like a strong buy in its category.

This setup is focused on speed and efficiency on paved roads. The tire size is around 28 mm, which is typical for fast road setups. Even though it’s tagged Endurance, the spec pushes it toward Road Only.