2025 Giant Escape Disc vs 2026 Surly Preamble Flat Bar
The M is the Surly Preamble Flat Bar size closest to your M Giant Escape 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 Surly Preamble Flat Bar
Compared with the Giant Escape Disc in M, the Surly Preamble Flat Bar in M places the top of the head tube 11 mm higher and 19 mm further back, relative to the bottom bracket. Its wheelbase is 45 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +11 mm
- Higher front end
- Frame reach
- −19 mm
- Shorter frame reach
- Wheelbase
- −45 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- −10 mm
- Shorter: livelier
The two frames
Giant Escape Disc, MSurly Preamble Flat Bar, MDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Giant Escape Disc M | Surly Preamble Flat Bar M | Difference |
|---|---|---|---|
| Reach | 410 | 391 | −19 mm |
| Stack | 556 | 567 | +11 mm |
| Head tube angle | 71.0° | 72 | +1.0° |
| Seat tube angle | 73.0° | 72.5 | −0.5° |
| Effective top tube | 580 | 570 | −10 mm |
| Chainstay length | 445 | 435 | −10 mm |
| Wheelbase | 1075 | 1030 | −45 mm |
| BB drop | 60 | 66 | +6 mm |
| Standover | 754 | 826 | +72 mm |
| Seat tube length | 485 | 565 | +80 mm |
| Head tube length | 130 | 130 | ±0 mm |
| Fork length | not listed | 400 |
Differences are the Surly Preamble Flat Bar minus the Giant Escape Disc. Full charts: 2025 Giant Escape Disc, 2026 Surly Preamble Flat Bar.
Where each sits in its class
Giant Escape DiscSurly Preamble Flat Bar
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 | Giant Escape DiscDisc 2 | Surly Preamble Flat BarFlat Bar |
|---|---|---|
| Frame | Giant ALUXX-grade | Surly Preamble |
| Fork | Giant Sport | not listed |
| Shifter | microSHIFT Advent | microSHIFT Acolyte Xpress |
| Derailleur | Giant micoSHIFT Advent | microSHIFT RD-M5185M |
| Cassette | Giant micorSHIFT Advent | not listed |
| Chain | KMC X9 | KMC Z8.3 |
| Crankset | Forged Alloy | not listed |
| Chainring | 40 narrow-wide | not listed |
| Bottom bracket | sealed cartridge | not listed |
| Pedals | Giant Urban Fitness | not listed |
| Wheelset | Giant double wall aluminum | not listed |
| Tire | Giant S-X2 | Kenda Kwik Tendril |
| Brake | Tektro HD-R280, Tektro TKD143 | Avid BB5 |
| Rotor | Giant MPH | not listed |
| Handlebar | Giant XS:60cm | not listed |
| Stem | Giant Sport | not listed |
| Grips | Giant ErgoContact | not listed |
| Headset | Giant OverDrive | not listed |
| Seatpost | Giant D-Fuse | not listed |
| Saddle | Giant ErgoContact | Selle Italia X |
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