2017 Specialized Sirrus Disc vs 2018 Surly Ogre
The S is the Surly Ogre size closest to your XS Specialized Sirrus 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 Ogre
Compared with the Specialized Sirrus Disc in XS, the Surly Ogre in S places the top of the head tube 29 mm higher and 8 mm further forward, relative to the bottom bracket. Its wheelbase is 7 mm shorter, which can contribute to quicker direction changes.
- Frame stack
- +29 mm
- Higher front end
- Frame reach
- +8 mm
- Longer frame reach
- Wheelbase
- −7 mm
- Shorter: quicker to change direction
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- −5 mm
- Shorter: livelier
The two frames
Specialized Sirrus Disc, XSSurly Ogre, SDrawn to scale and lined up at the bottom bracket.
Geometry side by side
| Measurement | Specialized Sirrus Disc XS | Surly Ogre S | Difference |
|---|---|---|---|
| Reach | 388mm | 395.5 | +8 mm |
| Stack | 563mm | 592 | +29 mm |
| Head tube angle | 70.5° | 71.5° | +1.0° |
| Seat tube angle | 73.5° | 73.0° | −0.5° |
| Effective top tube | 555mm | 575 | +20 mm |
| Chainstay length | 445mm | 440 | −5 mm |
| Wheelbase | 1056mm | 1049.4 | −7 mm |
| BB drop | 70mm | 68 | −2 mm |
| BB height | 281mm | not listed | |
| Standover | 716mm | 763.5 | +48 mm |
| Seat tube length | 395mm | 406.4 | +11 mm |
| Fork length | 410mm | 447 | +37 mm |
| Head tube length | 130mm | 110 | −20 mm |
Differences are the Surly Ogre minus the Specialized Sirrus Disc. Full charts: 2017 Specialized Sirrus Disc, 2018 Surly Ogre.
Where each sits in its class
Specialized Sirrus DiscSurly Ogre
Each bike is ranked against the other commuter 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 | Specialized Sirrus DiscDisc | Surly OgreOgre |
|---|---|---|
| Shifter | Shimano EF500 | Shimano Deore |
| Derailleur | Shimano Tourney, Shimano Altus | Shimano Deore Front, Shimano Deore Rear |
| Chain | KMC X8 | KMC X10 |
| Crankset | Specialized Stout | Shimano T551 |
| Tire | Specialized Nimbus Reflect | Surly Extraterrestrial |
| Saddle | Specialized Canopy Sport | WTB Volt Sport |
| Frame | not listed | Surly Ogre |
| Cassette | not listed | Shimano HG50 |
| Chainring | not listed | Shimano T551 |
| Bottom bracket | not listed | SRAM PowerSpline |
| Rim | not listed | WTB i29 |
| Brake | not listed | Avid BB7, Tektro FR5 |
| Handlebar | not listed | Surly Moloko |
| Stem | not listed | Kalloy AS-008 |
| Grips | not listed | Velo Black |
| Headset | not listed | Cane Creek 40 |
| Seatpost | not listed | Kalloy SP-342 |
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