SB4.5 Turq X01 Eagle Complete Mountain Bike - 2017
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If you're looking for a whip-fast bike that can handle some bigger terrain on occasion, look no further than the 2017 Yeti Cycles SB4.5 Turq X01 Eagle Complete Mountain Bike. It blends XC speed with geometry to handle the bigger stuff, and now carries Yeti's new Turq designation for an even lighter footprint than its predecessor. Turq manifests as a more precise carbon layup that's carefully molded to reinforce key stress points without adding bulk, resulting in strength where you need it and light weight where you don't. In the end, Yeti claims that Turq construction nets a savings of 300g compared to the regular SB4.5 Carbon—a stat that lends the SB4.5 Turq more climbing pedigree and complements the bike's surprisingly climb-happy X01 Eagle drivetrain.
Yeti also says that the SB4.5 has a stiffer pedaling platform than most of its other bikes. While we don't have numbers to verify this claim, it's definitely a responsive go-getter when the going gets mashy, and we think the inclusion of a Boost 148mm rear axle is at least partially responsible for the bike's eagerness on climbs. Coupled with the innate aggression of 29in wheels and the stiff, collet-style hardware, the boosted rear triangle certainly feels every bit as stiff as any of Yeti's other models.
The frame's aggressive speed is not to be outdone by its slack front end and surprisingly capable Switch Infinity suspension, though. Its 67.4-degree head tube is one of the slackest we've seen on an XC-leaning 29er, and it makes for a boost of confidence while picking lines across terrain that would make a more typical 70-degree head tube stumble. The Switch Infinity suspension is equally confidence-inspiring, and its linear travel hits the sweet spot of anti-squat to keep pedaling sharp across rocky climbs. It also erases the momentary harshness that its predecessor, the Switch Link design, would display when pushed to the absolute limit.
Of course, most riders didn't experience that dead spot on the Switch Link, but the SB4.5 isn't for most riders. It's for the all-mountain racer who demands that their machine flattens big hits with the same tenacity that it cleans long climbs. In our experience, the SB4.5's Switch Infinity suspension isn't quite as soft off the top as the 5.5 and it finds the bottom when we overshoot a landing. That said, the steeper head tube produces sharper handling and rewards technique while picking lines, making the SB4.5 more fun if you value finesse over just bombing terrain.
Details
- A mid-travel 29er with expanded capability
- 4.5in of smooth Switch Infinity suspension
- Geometry balances slack and moderate for confident handling
- Turq carbon construction drops weight and bolsters stiffness
- Boost axles track on descents and transfers power on climbs
- SRAM's X01 Eagle drivetrain provides the ultimate bailout gear
- Item #YTI006V
- Frame Material
- Turq carbon fiber
- Suspension
- Switch Infinity
- Rear Shock
- Fox Float Factory
- Rear Travel
- 114mm
- Fork
- Fox 34 Factory
- Front Travel
- 140mm
- Headset
- Cane Creek 40 inset taper
- Shifters
- SRAM X01 Eagle 12-speed
- Front Derailleur
- n/a
- Rear Derailleur
- SRAM X01 Eagle 12-speed
- Crankset
- 30t, SRAM X01 Eagle Carbon 12-speed
- Bottom Bracket
- SRAM GXP BB92
- Cassette
- 10 - 50t SRAM 1295 Eagle 12-speed
- Chain
- SRAM Eagle 12-speed
- Brakeset
- SRAM Guide RS
- Brake Type
- hydraulic disc
- Rotors
- [front] 180mm, SRAM Centerline, [rear] 160mm, SRAM Centerline
- Handlebar
- Yeti Carbon
- Handlebar Width
- 740 mm
- Grips
- Yeti lock-on
- Stem
- Easton Haven
- Stem Length
- 55mm
- Saddle
- Yeti WTB Custom
- Seatpost
- Race Face Turbine Dropper
- Seatpost Diameter
- 30.9mm
- Wheelset
- DT Swiss W/XM421 Boost
- Hubs
- DT Swiss 350
- Front Axle
- 15 x 110mm Boost thru-axle
- Rear Axle
- 12 x 148mm Boost thru-axle
- Tires
- Maxxis Ardent EXO Tubeless
- Tire Size
- [front] 29, x 2.4in, [rear] 29, x 2.25in
- Claimed Weight
- 27.2lb
- Recommended Use
- cross-country
- Manufacturer Warranty
- 5 years limited on frame
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