- Giant Defy Advanced Pro
- XS
- Stack 527, Reach 369
- Specialized Tarmac SL9
- 52
- Stack 527, Reach 380
Stack: practically identical
Reach: 11 mm longer
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Giant Defy Advanced Pro vs Specialized Tarmac SL9: which bike is right for you?
Compare ride character, intended rider, geometry, and fit. Add your measurements to see which bike suits you better and which size to choose on each.
Fit verdict: the frame positions differ enough to matter. Compare the geometry below, then use your measurements to identify the safer size and setup.
In one look
Giant Defy Advanced Pro: endurance geometry. Specialized Tarmac SL9: race geometry.
- The frame front of Giant Defy Advanced Pro is slightly higher, by about 4 mm. That difference alone does not settle your position.
- The frame front of Specialized Tarmac SL9 is about 9 mm longer. Handlebar position also depends on the stem and spacers.
The frame standards line up and we hold no sourced weight or performance claim that separates them. What is left to decide is your size and setup on each frame.
- Price
Specialized Tarmac SL9 is the dearer of the two, going by the cheapest build you can buy of each; Giant Defy Advanced Pro starts lower.
Subjective findings from independent tests on stock or near-stock builds. Tyres, pressure and size change how a frame feels.
We compare differences at frame and model level. Components, current price, and availability depend on the exact build and seller.
What do you need from this comparison?
Start with the decision you are making. We will ask only for the details needed to answer it.
Step 1/1
What are you trying to understand?
Your answer decides which questions follow and what the result focuses on.
Fit and size differences
Geometry can separate these bikes: matched sizes create a meaningfully different position.
Typical difference across matched sizes: frame front height 4 mm, forward length 9 mm.
For a personal answer, the fit-and-size path uses your measurements to show only the relevant frame sizes. The full chart remains available as a reference.
View geometry for every size
How do Giant Defy Advanced Pro and Specialized Tarmac SL9 sizes compare?
See the closest size matches and the differences in stack, reach, and riding position.
- Giant Defy Advanced Pro
- S
- Stack 541, Reach 375
- Specialized Tarmac SL9
- 54
- Stack 544, Reach 384
Stack: 3 mm taller
Reach: 9 mm longer
- Giant Defy Advanced Pro
- M
- Stack 558, Reach 380
- Specialized Tarmac SL9
- 54
- Stack 544, Reach 384
Stack: 14 mm lower
Reach: 4 mm longer
- Giant Defy Advanced Pro
- ML
- Stack 577, Reach 384
- Specialized Tarmac SL9
- 56
- Stack 565, Reach 395
Stack: 12 mm lower
Reach: 11 mm longer
- Giant Defy Advanced Pro
- L
- Stack 596, Reach 393
- Specialized Tarmac SL9
- 58
- Stack 591, Reach 402
Stack: 5 mm lower
Reach: 9 mm longer
- Giant Defy Advanced Pro
- XL
- Stack 615, Reach 402
- Specialized Tarmac SL9
- 61
- Stack 612, Reach 408
Stack: 3 mm lower
Reach: 6 mm longer
The same size label can create a different position on each frame. Stack and reach are one part of the decision; the personalized comparison connects them to your body and each bike’s ride character.
FAQ
- Can the same rider take different sizes on these two bikes?
- Yes. Frame labels are not standardized, so the same rider may need different sizes. This comparison deliberately avoids a generic matched-size answer and hands your measurements to Bike Fit instead.
- Which frame has the higher front: Giant Defy Advanced Pro or Specialized Tarmac SL9?
- The frame front of Giant Defy Advanced Pro is slightly higher, by about 4 mm. That difference alone does not settle your position.
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