Velopedia Bicycle Archive
Surly Krampus Front Suspension - Blue Oyster Coat
Mountain bicycle from the Velopedia specification archive.
- Model year
- Not published by manufacturer
- Original MSRP
- $2,699.00
- Sizes
- S, M, L, XL
- Colors
- Blue Oyster Coat
- Weight
- 34 lb. 9 oz. for Medium
- Geometry
- 4 manufacturer sizes · Ride analysis
- Archive ID
- 900000932
- Catalog verified
- August 19, 2026
Current market
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Velopedia analysis
What the specifications mean
Suspension is concentrated at the fork, so fork setup and rear-tire pressure are the main tools for balancing front and rear behavior. The 464% cassette range describes the available gearing more clearly than the component-group name alone. The rims and tires are tubeless-ready, but that label does not confirm the bike is currently set up without tubes; tape, valves, sealant and tire condition still matter.
Suspension setup
Front only
Fork settings affect the front while rear-wheel behavior remains dependent on tire and wheel setup.
Gearing
464% cassette range
Calculated from the published 11–51-tooth sprocket span.
Tire setup
Tubeless-ready
The rims and tires may support tubeless use, but the bike may still be running tubes.
Frame material
Steel
Paint damage and moisture entry matter because corrosion can start externally or inside the frame.
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameCheck paint chips, vent holes and the inside of the seat tube for corrosion. Also look for dents, bent tubes and cracking around welded or brazed joints.Inspect the frame and fork →
- BrakesTest each brake separately and confirm it stops firmly and releases cleanly. Inspect the pads and braking surfaces for wear or contamination, and check the cables or hoses for damage.Inspect the brakes →
- SuspensionAsk when the fork was last serviced. Check the stanchions for damage, look for oil at the seals and make sure the fork moves smoothly without bushing play.Evaluate the suspension →
- DrivetrainShift through every gear under light load and measure chain wear. Confirm that the shifter, derailleur, chain and cassette belong to the same 12-speed system.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads. If it is set up tubeless, confirm both tires hold pressure and ask when the sealant was last refreshed.Check wheels and tires →
Bike-specific inspection checklist 21 checks based on 6 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: Surly Krampus Front Suspension - Blue Oyster Coat · Mountain · Published sizes: S, M, L, XL
Frame and fork
Inspect the frame and fork →Archived: Frame: Surly Krampus - 100% Surly Chromoly Steel, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated · Fork: RockShox 35 Gold RL, 29", 15 x 110mm, 120mm Travel, 51mm offset
Suspension
Evaluate the suspension →Archived: Fork: RockShox 35 Gold RL, 29", 15 x 110mm, 120mm Travel, 51mm offset
Drivetrain
Check drivetrain wear →Archived: Shifters: Shimano Deore XT M8100 · Rear derailleur: Shimano M8100 XT SGS · Crankset: Shimano MT511, 30T · Bottom bracket: Shimano MT501, BSA · Cassette: SunRace CSMZ800, 11-51t, 12-spd · Chain: KMC X12 Anti-Rust
Brakes
Inspect the brakes →Archived: Brakes: Brake Calipers: Tektro HD-M3520; Brake Levers: Tektro HD-M3520; Rotors: Tektro 180/160, 6-Bolt
Wheels and tires
Check wheels and tires →Archived: Wheel size: 29" · Rims: WTB ST i30 TCS 2.0 · Hubs: (F) Novatec 15x110mm, 32h, 6-bolt / (R) Novatec 12x148mm, 32h, 6-bolt · Front tire: Surly Dirt Wizard 29 x 2.6", 60tpi, Tubeless Ready · Rear tire: Surly Dirt Wizard 29 x 2.6", 60tpi, Tubeless Ready
Controls and contact points
Archived: Headset: Cane Creek · Handlebar: Salsa Rustler 31.8 · Stem: ProMax 31.8mm · Seatpost: Trans X JD-YSP15, 30.9mm, 120mm travel · Saddle: WTB Volt
Before and during the test ride
Follow the full used-bike inspection order →Interpretation based on the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Frameset
| Frame Construction | Surly Krampus - 100% Surly Chromoly Steel, Natch tubing, double-butted main triangle, trumpet flared tubes, TIG welded, E.D. coated |
|---|---|
| Frame Material | Steel |
| Fork | RockShox 35 Gold RL, 29", 15 x 110mm, 120mm Travel, 51mm offset |
Drivetrain
| Shifters | Shimano Deore XT M8100 |
|---|---|
| Front Derailleur | N/A |
| Rear Derailleur | Shimano M8100 XT SGS |
| Crankset | Shimano MT511, 30T |
| Bottom Bracket | Shimano MT501, BSA |
| Cassette | SunRace CSMZ800, 11-51t, 12-spd |
| Chain | KMC X12 Anti-Rust |
Brakes
| Brakes | Brake Calipers: Tektro HD-M3520; Brake Levers: Tektro HD-M3520; Rotors: Tektro 180/160, 6-Bolt |
|---|
Cockpit & Contact Points
| Headset | Cane Creek |
|---|---|
| Handlebar | Salsa Rustler 31.8 |
| Stem | ProMax 31.8mm |
| Saddle | WTB Volt |
| Seatpost | Trans X JD-YSP15, 30.9mm, 120mm travel |
Wheels & Tires
| Hubs | (F) Novatec 15x110mm, 32h, 6-bolt / (R) Novatec 12x148mm, 32h, 6-bolt |
|---|---|
| Rims | WTB ST i30 TCS 2.0 |
| Spokes | 14G Black |
| Front Tire | Surly Dirt Wizard 29 x 2.6", 60tpi, Tubeless Ready |
| Rear Tire | Surly Dirt Wizard 29 x 2.6", 60tpi, Tubeless Ready |
| Wheel Size | 29" |
Size-specific frame data
Geometry
Manufacturer-published geometry normalized for consistent archival comparison. Effective top tube and reach remain separate measurements because they describe different aspects of fit.
| Measurement | Small | Medium | Large | X-Large |
|---|---|---|---|---|
| Seat tube | 368 mm | 419 mm | 470 mm | 521 mm |
| Effective top tube | 587 mm | 612 mm | 637 mm | 662 mm |
| Head tube | 90 mm | 100 mm | 110 mm | 120 mm |
| Head-tube angle | 68.4° | 68.4° | 68.4° | 68.4° |
| Seat-tube angle | 72.4° | 72.4° | 72.4° | 72.4° |
| Chainstay / rear center | 435 mm | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1096 mm | 1121 mm | 1147 mm | 1173 mm |
| Bottom-bracket drop | 60 mm | 60 mm | 60 mm | 60 mm |
| Reach | 397 mm | 419 mm | 442 mm | 464 mm |
| Stack | 597 mm | 607 mm | 616 mm | 626 mm |
| Standover height | 776 mm | 803 mm | 832 mm | 861 mm |
| Fork offset / rake | 51 mm | 51 mm | 51 mm | 51 mm |
| Fork length / axle-to-crown | 498 mm | 498 mm | 498 mm | 498 mm |
| Crank length | 165 mm | 170 mm | 170 mm | 175 mm |
| Stem length | 70 mm | 70 mm | 70 mm | 80 mm |
| Handlebar width | 750 mm | 800 mm | 800 mm | 800 mm |
Geometry source: Manufacturer HTML geometry table ↗ Measurements can vary by configuration, wheel size, or flip-chip position where noted by the manufacturer.
Geometry interpretation
What this geometry means
Small geometry
Riding position
The 597 mm stack is tall relative to the 397 mm reach, pointing to a more upright front-end position rather than an especially long, low cockpit. The 72.4° effective seat angle is comparatively relaxed for a modern mountain bike, placing the seated position farther behind the bottom bracket than a steep climbing-oriented layout.
Handling tendencies
A 68.4° head angle combined with a 1096 mm wheelbase points to quicker-steering and more responsive steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Medium geometry
Riding position
The 607 mm stack is tall relative to the 419 mm reach, pointing to a more upright front-end position rather than an especially long, low cockpit. The 72.4° effective seat angle is comparatively relaxed for a modern mountain bike, placing the seated position farther behind the bottom bracket than a steep climbing-oriented layout.
Handling tendencies
A 68.4° head angle combined with a 1121 mm wheelbase points to quicker-steering and more responsive steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Large geometry
Riding position
The 616 mm stack is tall relative to the 442 mm reach, pointing to a more upright front-end position rather than an especially long, low cockpit. The 72.4° effective seat angle is comparatively relaxed for a modern mountain bike, placing the seated position farther behind the bottom bracket than a steep climbing-oriented layout.
Handling tendencies
A 68.4° head angle combined with a 1147 mm wheelbase points to quicker-steering and more responsive steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
X-Large geometry
Riding position
A 464 mm reach paired with 626 mm of stack gives this size a moderate frame proportion: roomy enough when standing without pushing strongly toward either a very low or very upright front end. The 72.4° effective seat angle is comparatively relaxed for a modern mountain bike, placing the seated position farther behind the bottom bracket than a steep climbing-oriented layout.
Handling tendencies
A 68.4° head angle combined with a 1173 mm wheelbase points to quicker-steering and more responsive steering and chassis behavior. The longer the chassis and slacker the front end, the more the bike tends to favor composure over very quick direction changes.
Across the size range
From Small to X-Large, reach grows by 67 mm and stack by 29 mm, showing how the frame becomes both longer and taller through the published size range. The rear center stays essentially constant at about 435 mm across sizes, so most of the wheelbase growth happens in the front half of the bike rather than by lengthening the rear triangle.
Geometry describes frame proportions and likely tendencies, not a ride test. Rider proportions, cockpit setup, tires, suspension settings, wheel configuration, and component choices can materially change how a bicycle fits and feels.
Gallery
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.