3T Extrema Italia bike fit and size guide

Review the published geometry for the 2026 3T Extrema Italia, compare supported sizes, and open the TrainCraft calculator with this bike preselected.

Supported sizes

S, M, L, XL

Family

all-road geometry

This bike balances stability, comfort, and efficient power transfer for mixed-surface riding.

What to compare

Stack, reach, setup

Use this guide to compare stack, reach, and gravel-specific front-end assumptions before choosing a frame size.

Open calculator with 3T Extrema Italia Open generic bike fit tool View original geometry source

Geometry and size breakdown

The calculator button opens the bike step with this model and size already selected. Then enter rider measurements and run the fit report.

Size	Stack	Reach	Top tube	Head tube	Stem	Crank	Fit calculator
S	547 mm	358 mm	529 mm	142 mm	70 mm	170 mm	Use in calculator
M	570 mm	368 mm	547 mm	158 mm	80 mm	172.5 mm	Use in calculator
L	590 mm	376 mm	561 mm	175 mm	90 mm	172.5 mm	Use in calculator
XL	610 mm	384 mm	575 mm	196 mm	100 mm	175 mm	Use in calculator

How to use this guide

Start with the size table to narrow the geometry range you actually want. Then open the calculator to compare that geometry against your body dimensions, flexibility, and fit priorities.

The TrainCraft bike fit tool models saddle height, cockpit reach, and bar drop using the frame geometry plus stock cockpit assumptions for the 3T Extrema Italia.

That is more useful than a generic height chart because two sizes can both fit your height while requiring very different stems, spacers, or saddle positions.

FAQ

What sizes are available for the 3T Extrema Italia?

TrainCraft currently tracks these 3T Extrema Italia sizes: S, M, L, XL. The calculator uses each size's published geometry and stock cockpit assumptions to compare fit outcomes.

Can I use the TrainCraft calculator for 3T Extrema Italia sizing?

Yes. Open the calculator from this page to preload the 3T Extrema Italia, then compare sizes against your body measurements, fit priorities, flexibility, and riding posture preferences.

What should I compare on the 3T Extrema Italia before picking a size?

Start with stack, reach, effective top tube, and the stock stem/crank setup. TrainCraft uses those numbers to estimate cockpit reach, bar drop, saddle position, and how much adjustment headroom each size leaves.