Argon 18 Sum Pro vs Cervélo S5: geometry and fit comparison
Matched sizes, stack and reach deltas, and a fit check against your own body instead of guessing from two separate size charts.
The Argon 18 Sum Pro is built as a race geometry frame, the Cervélo S5 as a race geometry frame. The Cervélo S5 cockpit runs about 13 mm shorter, a noticeably more compact position. Across matched sizes the Argon 18 Sum Pro and Cervélo S5 front ends are within a few millimetres of each other, so posture will depend more on cockpit setup than on the frame.
For the Argon 18 Sum Pro in XXS there is no Cervélo S5 size with a comparable position: the range simply does not reach there.
Switching from a Argon 18 Sum Pro?
Your closest Cervélo S5 size, and what will still feel different about the position.
| You ride the Argon 18 Sum Pro in | Take the Cervélo S5 in | The position will feel |
|---|---|---|
| XS | 51 | 26 mm taller · 6 mm shorterDifferent position |
| S | 51 | 3 mm taller · 13 mm shorter |
| M | 54 | 2 mm taller · 13 mm shorter |
| L | 56 | 13 mm shorter |
| XL | 58 | 4 mm lower · 13 mm shorter |
Which one fits you better?
Run the same measurements through both frames. The likely size and the full fit report can differ more than the spec sheets suggest.
What Argon 18 Sum Pro size fits you?
Get an instant frame estimate, then continue into the full fit report to check cockpit reach, bar drop, and setup risks before you buy.
No account needed for this check. The full report keeps this bike preselected.
What Cervélo S5 size fits you?
Get an instant frame estimate, then continue into the full fit report to check cockpit reach, bar drop, and setup risks before you buy.
No account needed for this check. The full report keeps this bike preselected.
FAQ
Which has the taller front end: Argon 18 Sum Pro or Cervélo S5?
Across matched sizes the Argon 18 Sum Pro and Cervélo S5 front ends are within a few millimetres of each other, so posture will depend more on cockpit setup than on the frame.
Can the same rider take different sizes on these two bikes?
Yes, and it happens often: frame labels are not standardized. Use the matched-size table for geometry, then run the fit check below with your own measurements for each bike.
Free tools are just the start
TrainCraft builds structured training plans and adapts them when life gets in the way — powered by real fatigue science (CTL/ATL/TSB). Free to start.