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Yeti Cycles SB4.5 Turq X01 Eagle Complete Mountain Bike - 2018


Item # YTI00AE

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  • Raw, S ($6,999.00)
  • Raw, M ($6,999.00)
  • Raw, L ($6,999.00)
  • Raw, XL ($6,999.00)
  • Storm, S ($6,999.00)
  • Storm, M ($6,999.00)
  • Storm, L ($6,999.00)
  • Storm, XL ($6,999.00)
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Item # YTI00AE


Missing link.

If you're looking for a whip-fast bike that can handle some bigger terrain on occasion, look no further than Yeti Cycles' SB4.5 Turq X01 Eagle Complete Mountain Bike. It blends XC speed with geometry to handle the bigger stuff, so it's effectively the missing link between enduro and trail—something we'd feel comfortable with literally calling all-mountain.

This SB4.5 also carries Yeti's new Turq designation, which means the frame is even lighter and stiffer than the brand's standard carbon construction. It features 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 fewer grams where you don't. In the end, Yeti claims a reduction of 300g compared to the regular SB4.5 Carbon—a stat that lends the SB4.5 Turq more climbing pedigree and complements the ultimate bailout gear on the 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—if not stiffer than—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.

While Yeti's Shimano builds tend to feature Race Face cranks, this build takes full advantage of SRAM's Eagle gearing. The 30t chainring and comically huge 10-50t spread out back ensure you'll almost never find yourself without a gear whether you're burning up hardpack or laboring up a punishing grade. Either way, the finishing touch of Race Face's ever-popular Turbine dropper post ensures that you'll never be more than a switch throw away from keeping your saddle at the right height.

  • Turns out the missing link between trail and enduro is a 29er
  • 4.5in of Yeti's premier Switch Infinity devours big hits
  • Trail bike geometry remains stable across the funky stuff
  • Stubby stays keep wagon-wheel handling sharp
  • Turq carbon construction drops weight and bolsters stiffness
  • Massive BB shell and Boost spacing maintain stiff pedaling
  • Dropper post keeps your perch at the right height
  • SRAM's X01 Eagle drivetrain provides the ultimate bailout gear

Tech Specs

Frame Material:
Turq carbon fiber
Switch Infinity
Rear Shock:
FOX Factory DPS
Rear Travel:
FOX Factory 34
Front Travel:
Cane Creek 40
SRAM X01 Eagle
Front Derailleur:
Rear Derailleur:
SRAM X01 Eagle
ISCG Tabs:
30t SRAM X01 Eagle
Bottom Bracket:
10 - 50t SRAM 1275
SRAM X01 Eagle
Brake Type:
hydraulic disc
[front] 180mm, [rear] 160mm
Yeti Carbon
Handlebar Width:
Ergon GA2
Race Face Turbine Basic
Stem Length:
WTB custom
Race Face Turbine Basic
Seatpost Diameter:
[rims] DT Swiss XM421
DT Swiss 350
Front Axle:
15 x 110mm Boost
Rear Axle:
12 x 148mm Boost
Maxxis Ardent Exo TR
Tire Size:
[front] 29 x 2.4in, [rear] 29 x 2.25in
not included
Recommended Use:
Manufacturer Warranty:
5 years limited on frame



Claimed Weight

Claimed weights are provided by the vendor.

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Geometry Chart

Yeti Cycles

SB4.5 Carbon
140mm Travel Fork

Seat Tube

Effective Top Tube



Stand Over

Head Tube

Head Tube Angle

Seat Tube Angle

Bottom Bracket Height

Bottom Bracket Drop


S 16.5in 22.8in 23.9in 15.6in 29.6in 3.5in 67.4o 73.3o 13.1in   17.2in 44.4in
M 17.5in 23.8in 24.1in 16.6in 29.6in 3.7in 67.4o 73.3o 13.1in   17.2in 45.4in
L 19in 24.8in 24.5in 17.5in 29.6in 4.1in 67.4o 73.3o 13.1in   17.2in 46.4in
XL 20.5in 25.8in 25in 18.3in 29.6in 4.7in 67.4o 73.3o 13.1in   17.2in 47.5in

Reviews & Community


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Avg. ride time: 5h 39m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Almost a 5!

  • Familiarity: I've put it through the wringer

The bike has been a seriously great machine! Biggest challenge I had was that I’m between sizes and the L was likely too much...based on CC recs, I went with the M...and quickly changed the stem...It was a crowded cockpit...but after a 70mm stem it is fantastic. The reason for not getting a five is that the seat dropper is a challenge to push and it stopped working right after 100 miles...I have to pull on it to get it to go up the last inch or so. I’ve cleaned it and done adjustments, but it’s substandard for such a pricey ride.