3T Extrema Italia vs MMR Simun: 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 3T Extrema Italia is built as a all-road geometry frame, the MMR Simun as a race geometry frame. The MMR Simun cockpit runs about 32 mm longer, a noticeably more stretched position. Across matched sizes the 3T Extrema Italia and MMR Simun front ends are within a few millimetres of each other, so posture will depend more on cockpit setup than on the frame.
For the 3T Extrema Italia in XL there is no MMR Simun size with a comparable position: the range simply does not reach there.
Switching from a 3T Extrema Italia?
Your closest MMR Simun size, and what will still feel different about the position.
| You ride the 3T Extrema Italia in | Take the MMR Simun in | The position will feel |
|---|---|---|
| S | M | 3 mm taller · 32 mm longerDifferent position |
| M | L | 5 mm taller · 32 mm longerDifferent position |
| L | L | 15 mm lower · 24 mm longerDifferent position |
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 3T Extrema Italia 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 MMR Simun 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: 3T Extrema Italia or MMR Simun?
Across matched sizes the 3T Extrema Italia and MMR Simun 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.