2024 Trek FX Gen 3 vs 2026 3T Primo
The L is the 3T Primo size closest to your L Trek FX Gen 3. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the 3T Primo
Compared with the Trek FX Gen 3 in L, the 3T Primo in L places the top of the head tube 11 mm lower and 8 mm further back, relative to the bottom bracket.
- Frame stack
- −11 mm
- Lower front end
- Frame reach
- −8 mm
- Shorter frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Trek FX Gen 3 numbers we have for size L are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Gen 3 L | 3T Primo L | Difference |
|---|---|---|---|
| Reach | 398 | 390 | −8 mm |
| Stack | 586 | 575 | −11 mm |
| Head tube angle | 71.5° | 72.5 | +1.0° |
| Effective top tube | 571 | 571 | ±0 mm |
| Chainstay length | 450 | not listed | |
| Wheelbase | 1070 | not listed | |
| BB drop | 65 | 70 | +5 mm |
| BB height | 296 | not listed | |
| Standover | 799 | not listed | |
| Seat tube length | 508 | not listed | |
| Head tube length | 160 | 150 | −10 mm |
| Seat tube angle | not listed | 72.5 |
Differences are the 3T Primo minus the Trek FX Gen 3. Full charts: 2024 Trek FX Gen 3, 2026 3T Primo.
Where each sits in its class
Trek FX Gen 33T Primo
Each bike is ranked against the other gravel bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Trek FX Gen 31 Gen 3 | 3T PrimoGRX 1X12 |
|---|---|---|
| Frame | Trek Alpha Gold | 3T Primo2 |
| Fork | Trek FX | 3T Fango Primo2 |
| Shifter | Shimano Altus EF500 | Shimano GRX RX610 |
| Derailleur | Shimano Tourney TY510, Shimano Acera M310 | Shimano GRX RX822 SGS |
| Cassette | SunRace MFM300 | Shimano Deore M6100 |
| Chain | KMC Z7 | not listed |
| Bottom bracket | VP BC73 | not listed |
| Tire | Bontrager H2 | Pirelli Cinturato Adventure |
| Hub | Formula FM21, Formula FM31 | not listed |
| Rim | Bontrager Connection | not listed |
| Crankset | not listed | Shimano GRX RX610 |
| Wheelset | not listed | Fulcrum Rapid Red 900 |
| Brake | not listed | Shimano GRX RX400 |
| Rotor | not listed | Shimano SM-RT64 |
| Handlebar | not listed | 3T Superergo PRO |
| Stem | not listed | 3T Apto |
| Seatpost | not listed | 3T Primo |
| Saddle | not listed | fizik Vento Argo X5 |
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