Overview
The Yeti SB120 is one of the most versatile trail bikes in Yeti’s lineup, offering 120mm of rear travel paired with a 130mm fork. It sits between the XC-focused ASR and the more aggressive SB140, making it an ideal choice for riders who want a bike that climbs efficiently but handles technical descents with confidence. The SB120 uses Yeti’s Switch Infinity suspension platform with 29-inch wheels across all six sizes (XS–XXL). The frame is available in both Turq and Carbon Series layups.
New to bike geometry? Our complete guide to mountain bike geometry explains every measurement and what it means for your riding. You can also learn how to read a geometry chart to compare this bike against other models.
The SB120 runs a 66.2° head angle with a 76.1–76.2° effective seat angle — numbers that balance descending confidence with climbing efficiency. Reach ranges from 391mm (XS) to 511mm (XXL), with size-specific chainstay lengths starting at 432mm and growing progressively to 442mm on the XXL. The BB height is consistent at 338mm across all sizes. The SB120 also comes in a Lunch Ride (LR) configuration with a 140mm fork for riders who want slightly more downhill capability from the same platform.
Geometry Diagram
Geometry Table
| Measurement | XS | SM | MD | LG | XL | XXL |
|---|---|---|---|---|---|---|
| Head Tube Angle | 66.2° | 66.2° | 66.2° | 66.2° | 66.2° | 66.2° |
| Seat Tube Angle (eff.) | 76.1° | 76.2° | 76.2° | 76.2° | 76.2° | 76.2° |
| Seat Tube Length | 345mm | 366mm | 399mm | 439mm | 470mm | 485mm |
| Reach | 391mm | 422mm | 452mm | 473mm | 498mm | 511mm |
| Stack | 607mm | 612mm | 617mm | 627mm | 638mm | 658mm |
| Wheelbase | 1125mm | 1161mm | 1194mm | 1219mm | 1252mm | 1278mm |
| Chainstay Length | 432mm | 434mm | 437mm | 439mm | 442mm | 442mm |
| BB Height | 338mm | 338mm | 338mm | 338mm | 338mm | 338mm |
| Head Tube Length | 91mm | 99mm | 104mm | 114mm | 124mm | 147mm |
| Standover | 709mm | 711mm | 716mm | 721mm | 724mm | 727mm |
| Fork Offset | 43mm | 43mm | 43mm | 43mm | 43mm | 43mm |
Geometry Analysis
The SB120’s 66.2° head angle is slightly steeper than the SB140 (65°), reflecting its shorter-travel, trail-oriented character. The near-identical effective seat angles (76.1–76.2°) across the size range ensure consistent climbing positions regardless of frame size. Yeti’s size-specific chainstays (432–442mm) are a standout feature — smaller riders get shorter chainstays for better maneuverability, while larger frames maintain proportional handling. The 338mm BB height is a reasonable middle ground that avoids excessive pedal strikes while keeping the center of gravity low. The consistent 43mm fork offset across all sizes maintains trail (mechanical trail) at a level that delivers predictable, confidence-inspiring steering.
Ride Characteristics
The SB120 is the quintessential ‘do-everything’ trail bike. The Switch Infinity suspension provides excellent pedaling efficiency on climbs — you can leave the shock wide open and still feel efficient on long ascents. On descents, the 120mm of travel is remarkably capable, soaking up roots, rocks, and small drops with composure. The 29-inch wheels maintain speed through rough sections, and the moderate geometry makes the bike feel balanced and intuitive whether you’re climbing a fire road or navigating technical singletrack. The Lunch Ride variant adds a 140mm fork for riders who favor descending, effectively creating a mini-enduro that still pedals well.
Key Specs
Frame: Carbon (Turq and C Series). Wheel Size: 29″. Travel: 130mm fork / 120mm rear (LR: 140mm fork). Suspension: Switch Infinity. Drivetrain: SRAM/Shimano (build dependent). Fork: FOX 34/36. Shock: FOX Float. Sizes: XS, SM, MD, LG, XL, XXL.
What’s New vs Previous Generation
The current SB120 features refined Switch Infinity kinematics for improved small-bump sensitivity and a wider range of adjustability. The frame has been optimized for weight savings while improving stiffness at key junctions. Internal cable routing has been updated for easier maintenance, and the addition of a Lunch Ride (LR) option with a 140mm fork gives riders the ability to bias the platform toward descending without committing to a larger-travel bike.
Who Should Consider This Bike
The SB120 is perfect for trail riders who value versatility — those who want a bike that climbs efficiently enough for all-day epics but has enough travel and capability for technical terrain. If your rides are roughly balanced between climbing and descending, and you don’t need 150mm+ of travel, the SB120 is an outstanding choice. XC racers should look at the ASR, and aggressive enduro riders should consider the SB140 or SB160.
Comparable Models
The SB120 competes with the Santa Cruz Tallboy (130/120mm), Specialized Stumpjumper 15 (140/130mm), Trek Fuel EX (140/130mm), and Pivot Trail 429. All offer short-to-mid travel in the 120–140mm range with 29-inch wheels. The SB120 differentiates itself with Switch Infinity suspension and the Lunch Ride option. The Tallboy uses VPP suspension with slightly more travel, while the Stumpjumper 15 EVO offers a broader range of geometry adjustment. The Pivot Trail 429 uses DW-Link and is similarly versatile.
Related Geometry
More Yeti geometry: 2023 Trek Remedy Geometry, 2023 Yeti SB120 Geometry, 2023 Yeti SB135 Geometry, 2023 Yeti SB140 Geometry, 2023 Yeti SB160 Geometry.
Compare trail bikes: 2023 Giant Stance Geometry, 2023 Giant Trance Geometry, 2023 Norco Fluid FS Geometry.
Frequently Asked Questions
What is the difference between the SB120 and SB120 LR?
The SB120 LR (Lunch Ride) uses the same 120mm rear-travel frame but pairs it with a longer 140mm fork instead of the standard 130mm fork. This slackens the head angle slightly and increases front-end height, biasing the bike toward descending performance while still using the same efficient Switch Infinity platform. The LR is ideal for riders who want more downhill capability without stepping up to the SB140.
How many sizes does the Yeti SB120 come in?
The SB120 comes in six sizes: XS, SM, MD, LG, XL, and XXL. This is one of the widest size ranges available and ensures a good fit for riders from approximately 5’0″ to 6’6″+.
What suspension does the Yeti SB120 use?
The SB120 uses Yeti’s Switch Infinity suspension, developed in partnership with FOX Racing Shox. It features a translating pivot on vertical rails rather than a traditional rotating pivot, providing excellent pedaling efficiency and small-bump sensitivity throughout the travel.
Is the Yeti SB120 good for racing?
The SB120 is an excellent trail racing bike and performs well in endurance events and stage races. Its efficient pedaling platform, moderate weight, and capable descending make it competitive in downcountry and trail categories. For pure XC racing, the lighter ASR would be a better choice.
Does the Yeti SB120 have adjustable geometry?
The SB120 does not feature a flip chip or adjustable geometry. The geometry is fixed to optimize the Switch Infinity suspension performance. Riders wanting geometry adjustability should consider the Lunch Ride variant with the longer fork as an alternative way to change the bike’s handling character.