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 Propel Advanced Pro 1 or Specialized Tarmac SL9?

Across matched sizes, the frame fronts of Giant Propel Advanced Pro 1 and Specialized Tarmac SL9 differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.

Language

Giant Propel Advanced Pro 1 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: these frames put you in effectively the same position, so geometry will not decide this pair. What can: the sourced differences below and, once you enter your measurements, your size and setup on each frame.

Compare them for me Compare geometry and sizes

In one look

Giant Propel Advanced Pro 1: race geometry. Specialized Tarmac SL9: race geometry.

Across matched sizes, the frame fronts of Giant Propel Advanced Pro 1 and Specialized Tarmac SL9 differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.
The forward length of the frame is nearly the same across matched sizes.

These two split on bottom bracket; the sourced values are below. What each difference means for your size, your setup and the riding you describe is in the full comparison.

Bottom bracketDiffersSource 1 Source 2
Giant Propel Advanced Pro 1
Press fit
Specialized Tarmac SL9
Threaded
A threaded bottom bracket is simpler to service and less prone to creaking; press fit saves weight and allows a wider shell.
Price
Specialized Tarmac SL9 is the dearer of the two, going by the cheapest build you can buy of each; Giant Propel Advanced Pro 1 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.

2025 • race geometry: Giant Propel Advanced Pro 1; Full size guide
2026 • race geometry: Specialized Tarmac SL9; Full size guide

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 does not separate these bikes: matched sizes put the rider in effectively the same position.

Typical difference across matched sizes: frame front height 1 mm, forward length 2 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 Propel Advanced Pro 1 and Specialized Tarmac SL9 sizes compare?

See the closest size matches and the differences in stack, reach, and riding position.

Giant Propel Advanced Pro 1: XS; Stack 517, Reach 376
Specialized Tarmac SL9: 49; Stack 514, Reach 375

Stack: 3 mm lower

Reach: practically identical

Giant Propel Advanced Pro 1: S; Stack 528, Reach 383
Specialized Tarmac SL9: 52; Stack 527, Reach 380

Stack: practically identical

Reach: 3 mm shorter

Giant Propel Advanced Pro 1: M; Stack 545, Reach 388
Specialized Tarmac SL9: 54; Stack 544, Reach 384

Stack: practically identical

Reach: 4 mm shorter

Giant Propel Advanced Pro 1: ML; Stack 562, Reach 393
Specialized Tarmac SL9: 56; Stack 565, Reach 395

Stack: 3 mm taller

Reach: practically identical

Giant Propel Advanced Pro 1: L; Stack 581, Reach 402
Specialized Tarmac SL9: 58; Stack 591, Reach 402

Stack: 10 mm taller

Reach: practically identical

Giant Propel Advanced Pro 1: XL; Stack 596, Reach 412
Specialized Tarmac SL9: 58; Stack 591, Reach 402

Stack: 5 mm lower

Reach: 10 mm shorter

Giant Propel Advanced Pro 1	Specialized Tarmac SL9	The position will feel
XSStack 517 · Reach 376	49Stack 514 · Reach 375	Stack: 3 mm lower · Reach: practically identical
SStack 528 · Reach 383	52Stack 527 · Reach 380	Stack: practically identical · Reach: 3 mm shorter
MStack 545 · Reach 388	54Stack 544 · Reach 384	Stack: practically identical · Reach: 4 mm shorter
MLStack 562 · Reach 393	56Stack 565 · Reach 395	Stack: 3 mm taller · Reach: practically identical
LStack 581 · Reach 402	58Stack 591 · Reach 402	Stack: 10 mm taller · Reach: practically identical
XLStack 596 · Reach 412	58Stack 591 · Reach 402	Stack: 5 mm lower · Reach: 10 mm shorter

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 Propel Advanced Pro 1 or Specialized Tarmac SL9?: Across matched sizes, the frame fronts of Giant Propel Advanced Pro 1 and Specialized Tarmac SL9 differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.

TrainCraft plans

Build training around the week you actually have

Set a goal, choose when you can ride, and get a structured plan that adjusts as your fatigue and availability change.

Build a free plan View pricing