2021 Trek FX Disc vs 2021 Giant Roam 4 Disc
The S is the Giant Roam 4 Disc size closest to your L Trek FX Disc. 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 Giant Roam 4 Disc
Compared with the Trek FX Disc in L, the Giant Roam 4 Disc in S places the top of the head tube 20 mm higher and 6 mm further forward, relative to the bottom bracket. Its wheelbase is 18 mm longer, which can contribute to stability at speed.
- Frame stack
- +20 mm
- Higher front end
- Frame reach
- +6 mm
- Longer frame reach
- Wheelbase
- +18 mm
- Longer: steadier at speed
- Head angle
- −1.0°
- Slacker: calmer steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek FX Disc numbers we have for size L are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek FX Disc L | Giant Roam 4 Disc S | Difference |
|---|---|---|---|
| Reach | 398 | 404 | +6 mm |
| Stack | 586 | 606 | +20 mm |
| Head tube angle | 71.5° | 70.5° | −1.0° |
| Effective top tube | 571 | not listed | |
| Chainstay length | 450 | 450 | ±0 mm |
| Wheelbase | 1070 | 1088 | +18 mm |
| BB drop | 65 | 62 | −3 mm |
| BB height | 296 | not listed | |
| Standover | 799 | 725 | −74 mm |
| Seat tube length | 508 | 420 | −88 mm |
| Head tube length | 160 | 115 | −45 mm |
| Seat tube angle | not listed | 73.0° |
Differences are the Giant Roam 4 Disc minus the Trek FX Disc. Full charts: 2021 Trek FX Disc, 2021 Giant Roam 4 Disc.
Where each sits in its class
Trek FX DiscGiant Roam 4 Disc
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 Disc1 Disc | Giant Roam 4 DiscRoam 4 Disc |
|---|---|---|
| Frame | Trek Alpha Gold | not listed |
| Fork | Trek FX | SR Suntour NEX |
| Shifter | Shimano Altus EF500 | Shimano Altus |
| Derailleur | Shimano Tourney TY510, Shimano Acera M310 | Shimano Tourney, Shimano Altus |
| Cassette | SunRace MFM300 | Shimano HG200 |
| Chain | KMC Z7 | KMC Z7 |
| Bottom bracket | VP BC73 | not listed |
| Tire | Bontrager H2 Comp | Giant Crosscut |
| Hub | Formula DC20, Formula DC-31 | not listed |
| Rim | Bontrager Connection | not listed |
| Brake | Tektro MD-U310 | Tektro TKB-172 |
| Wheelset | not listed | Giant GX03 |
| Handlebar | not listed | Giant Sport XC |
| Stem | not listed | Giant Sport |
| Seatpost | not listed | Giant D-Fuse |
| Saddle | not listed | Giant Sport Comfort |
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