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: Specialized Tarmac SL9 or Winspace M6 Aero 105 Di2?

Across matched sizes, the frame fronts of Specialized Tarmac SL9 and Winspace M6 Aero 105 Di2 differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.

Specialized Tarmac SL9 vs Winspace M6 Aero 105 Di2: 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

Specialized Tarmac SL9: race geometry. Winspace M6 Aero 105 Di2: cross-country geometry.

Across matched sizes, the frame fronts of Specialized Tarmac SL9 and Winspace M6 Aero 105 Di2 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.

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; Winspace M6 Aero 105 Di2 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.

2026 • race geometry: Specialized Tarmac SL9; Size guide and geometry for the Specialized Tarmac SL9
2026 • cross-country geometry: Winspace M6 Aero 105 Di2; Size guide and geometry for the Winspace M6 Aero 105 Di2

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 2 mm, forward length 1 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 Specialized Tarmac SL9 and Winspace M6 Aero 105 Di2 sizes compare?

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

Specialized Tarmac SL9: 44; Stack 501, Reach 366
Winspace M6 Aero 105 Di2: XS; Stack 507, Reach 365

Stack: 6 mm taller

Reach: practically identical

Specialized Tarmac SL9: 49; Stack 514, Reach 375
Winspace M6 Aero 105 Di2: S; Stack 521, Reach 374

Stack: 7 mm taller

Reach: practically identical

Specialized Tarmac SL9: 52; Stack 527, Reach 380
Winspace M6 Aero 105 Di2: M; Stack 535, Reach 383

Stack: 8 mm taller

Reach: 3 mm longer

Specialized Tarmac SL9: 54; Stack 544, Reach 384
Winspace M6 Aero 105 Di2: M; Stack 535, Reach 383

Stack: 9 mm lower

Reach: practically identical

Specialized Tarmac SL9: 56; Stack 565, Reach 395
Winspace M6 Aero 105 Di2: XL; Stack 564, Reach 400

Stack: practically identical

Reach: 5 mm longer

Specialized Tarmac SL9: 58; Stack 591, Reach 402
Winspace M6 Aero 105 Di2: XXL; Stack 593, Reach 407

Stack: practically identical

Reach: 5 mm longer

Specialized Tarmac SL9: 61; Stack 612, Reach 408
Winspace M6 Aero 105 Di2: XXL; Stack 593, Reach 407

Stack: 19 mm lower

Reach: practically identical

Specialized Tarmac SL9	Winspace M6 Aero 105 Di2	The position will feel
44Stack 501 · Reach 366	XSStack 507 · Reach 365	Stack: 6 mm taller · Reach: practically identical
49Stack 514 · Reach 375	SStack 521 · Reach 374	Stack: 7 mm taller · Reach: practically identical
52Stack 527 · Reach 380	MStack 535 · Reach 383	Stack: 8 mm taller · Reach: 3 mm longer
54Stack 544 · Reach 384	MStack 535 · Reach 383	Stack: 9 mm lower · Reach: practically identical
56Stack 565 · Reach 395	XLStack 564 · Reach 400	Stack: practically identical · Reach: 5 mm longer
58Stack 591 · Reach 402	XXLStack 593 · Reach 407	Stack: practically identical · Reach: 5 mm longer
61Stack 612 · Reach 408	XXLStack 593 · Reach 407	Stack: 19 mm lower · Reach: practically identical

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: Specialized Tarmac SL9 or Winspace M6 Aero 105 Di2?: Across matched sizes, the frame fronts of Specialized Tarmac SL9 and Winspace M6 Aero 105 Di2 differ by only a few millimetres. Stem and spacer choices will have more effect on handlebar position.

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