Functionally identical at the sizes most riders buy. At size 54, both bikes share a 555 mm stack, 384 mm reach, 71.2-degree head tube angle, and 58 mm trail. The only differences are 2 mm in chainstay length (CAAD13 408 mm, SuperSix EVO 410 mm) and 2 mm in wheelbase (1008 vs 1010). Cannondale designed the CAAD13 to share the SuperSix EVO's geometry on purpose — the two were built to be training-and-racing siblings, not different fits.

Both use variable fork rake across the size range (55 mm offset on smaller frames, 45 mm on larger) to keep trail constant at 58 mm.

Close, with caveats. Reviewers consistently say the CAAD13 delivers "as much as 90% of the performance" of comparable carbon at a much lower price (Cyclist) and that blindfolded "few people would notice immediately that they were riding an aluminium bike" (Cyclist).

The two real gaps are weight and aero. The CAAD13 105 Di2 weighs around 8.2–8.6 kg vs roughly 7 kg or less for higher-trim SuperSix EVO carbon builds, and the EVO Gen 4 saves a claimed 12 watts at 45 km/h over its predecessor thanks to deeper aero tubing and an integrated cockpit. On flats and long climbs, you'll feel both.

It's the single biggest long-term reliability difference between the two. The CAAD13 still uses BB30a press-fit, which has a well-documented history of creaks; multiple reviewers note that even when test bikes stay quiet during short reviews, longer-term ownership often brings issues.

The SuperSix EVO Gen 4 switched to threaded BSA, a change reviewers have called "monumental" for serviceability. If you're a home mechanic, prefer to do your own work, or just hate creaks, that's a real point in the EVO's column.

CAAD13: 30 mm officially, with some reviewers reporting 32 mm fits.

SuperSix EVO Gen 4: 32 mm officially, and reviewers have repeatedly fit 34 mm in practice.

Neither is a gravel bike. But the EVO's extra clearance makes it noticeably more capable on rough tarmac, light gravel, and broken pavement — useful if your typical roads aren't smooth.

Both have hidden mudguard mounts, which is unusual at this performance tier. The CAAD13 has the edge for hard winter use because the frame is cheaper to replace if it cracks, more tolerant of road salt, and arguably less worth crying over after an icy crash.

Reviewers have logged 16,000+ km on a CAAD13 through British winters with no frame issues. The SuperSix EVO will mount guards just as well — but most owners won't put $7k+ of carbon through that life.

Yes — and this is exactly the pairing Cannondale designed for. The geometry is shared, so your fit transfers without adjustment. You can move pedals, saddle, and bottle cages between the two and feel at home immediately.

Many riders use the CAAD13 as the bike that takes the salt, sees the trainer, and serves crit-race duty, while the EVO stays clean for fast group rides and Sunday efforts.

Wheels and tires, in that order. Multiple reviewers note the stock DT Swiss R470 alloy wheels and Vittoria Rubino Pro tires are the biggest performance ceiling. Velo's review specifically called out swapping the stock Rubinos for supple Vittoria Corsa Control tires with latex tubes as transformative.

A carbon wheelset upgrade ($1,000–$2,000 used) gets the CAAD13 to ride closer to a mid-tier carbon SuperSix EVO than the price gap would suggest. It's the path BikeRadar and Cycling Weekly both explicitly recommend.

On the CAAD13, the 105 Di2 build at $3,700 is the value sweet spot — wireless electronic shifting, the same frame as the cheaper rim-brake, and the only build where the components do justice to the chassis.

On the SuperSix EVO, the spread is wider. The EVO 3 ($6,999, 105 Di2) is the apples-to-apples comparison to the CAAD13's top build — same drivetrain tier, same wheels. If you're buying for carbon wheels and the SystemBar R-One cockpit, you need the Hi-Mod 2 ($9,999) or up. The entry-level 6 ($2,999) is the cheapest way into the carbon frame, but it ships with basic Vittoria Zaffiro Pro slicks and no electronic shifting.