Specialized Diverge 4 Sport Carbon vs Specialized Diverge STR
Both published charts held against each other, on the specs that decide what the bike carries.
The short answer
The Diverge 4 Sport Carbon takes price; the Diverge STR takes the rack path, fork cargo mounts and dropper compatibility. Which matters more is your route, not a scoreboard.
Assembled from the differences below rather than written over them, so it cannot drift from the table. Every figure is the manufacturer's; nobody here has ridden either bike.
Where they differ
4 of the 7 things we can compare come out differently. The rest are close enough not to decide anything.
Rear rack
Diverge STR is the one you can bolt a rack to without hunting for partsRead from each maker's own mount wording. An adapter is a real cost the price tag does not mention, and 'not published' is not the same as no — it just is not something to buy a rack on.
Fork cargo mounts
only the Diverge STR publishes somewhere to bolt a cageCage mounts on the fork blades. This moves weight low and off the bars, which is where a heavy bar roll does the most to the steering.
Dropper post
only the Diverge STR publishes dropper routingA dropper cannot be strapped to, so fitting one rules out almost every seat pack and leaves rail-mounted bags at a fraction of the volume. It is a capability and a constraint at once.
From
$699.99 between themManufacturer's cheapest complete build. Every spec above belongs to the frame and does not change between builds of the same model, so the cheapest build of the right frame is usually the right answer.
Side by side
Including the rows where the two are level, because a spec that doesn't separate them is still a spec you might be checking.
| Specialized Diverge 4 Sport Carbon | Specialized Diverge STR | |
|---|---|---|
| Frame bag space | 1653 cm² | 1612 cm² |
| Widest published tire | 50mm on 700c / 29in | 47mm on 700c / 29in, 53mm on 650b / 27.5in |
| Rear rack | Not published | Bolts straight on |
| Fork cargo mounts | None published | Published |
| Dropper post | Not published | Compatible |
| Chainstay | 430mm | 429mm |
| From | $3,500 | $4,199.99 |
| Sizes | 6 | 6 |
| Frame | Specialized Diverge FACT 9r carbon | Carbon |
Drawn to scale
Largest published size of each, built from the charts rather than illustrated. The front triangle is the part that decides frame bag fit.
