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Yeti Cycles SB4.5 Turq Mountain Bike Frame - 2017

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Item # YTI006U

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  • Black, L ($3,400.00)
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Cross over.

Yeti Cycles is well known for its big hit, big travel enduro sleds, so it should be no surprise that its shorter travel bikes bring a bit of that heritage along for the ride. The 2017 SB4.5 Turq Mountain Bike Frame blends a focus on XC speed with geometry that pushes its capabilities into much larger terrain. This particular frame also carries the new Turq designation, which provides strength where you need it, and lightness where you don't. For the SB4.5 Turq, that means a more precise carbon layup, carefully molded to reinforce key stress points along the frame without adding bulk and claimed to reduce weight by 300g compared to the regular version.

Yeti claims 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 70-71 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 will never 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 — a rare breed in the enduro scene as a whole, but common enough in Yeti's following of enduro, bikepacking, and XC rocket ship pilots. 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're into finesse over just bombing terrain with your eyes closed.

  • An XC machine that pushes the boundaries of 29in wheels
  • 4.5in of smooth Switch Infinity suspension
  • Geometry straddles the boundary of slack and moderate
  • Steep angles (for Yeti) reward a surgical approach to terrain
  • Turq carbon construction drops weight and bolsters stiffness
  • Boost axle tracks transfers power more effeciently on climbs
  • Built for one-by drivetrains only

Tech Specs

Frame Material:
Turq carbon fiber
Suspension:
Switch Infinity
Wheel Size:
29in
Rear Shock:
Fox Float Factory
Rear Travel:
114mm
Head Tube Diameter:
44/56mm tapered inset
Headset Included:
no
Bottom Bracket Type:
PF92
Cable Routing:
internal
Front Derailleur Mount:
n/a - one-by only
Brake Type:
post-mount disc
Seatpost Diameter:
30.9mm
Rear Axle:
12 x 148mm Boost thru-axle
Claimed Weight:
5lb 4.5oz
Recommended Use:
cross country
Manufacturer Warranty:
5 years limited

sizing chart

SB4.5 size by rider height

|

Geometry chart

Yeti Cycles

Geometry Chart

 

SB4.5 Carbon
140mm Travel Fork
 

Seat Tube

(c-t)

Effective Top Tube

(eTT)

Stack

(S)

Reach

(R)

Stand Over

Head Tube

(HT)

Head Tube Angle

(HTo)

Seat Tube Angle

(STo)

Bottom Bracket Height

(BBH)

Chainstay

(CS)

Wheelbase
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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Best bike I have ever ridden.

  • Familiarity: I've put it through the wringer

I spent several months researching what bike I wanted to purchase and landed on this or the 5.5. I ended up going with the 4.5 due to the amount of climbing I do. I got this bike in an XL with me being 6ft 3in 185lbs. The only thing that I have changed on the bike is my stem length. I went from a 50mm to a 35mm and the bike fits like a glove. I have put over 300 miles and almost 27000 of elevation gain. All the reviews don't lie this bike is a climbing machine. I never lock out my suspension on this bike. I'm not sure what else to say about the bike it was worth every hard earned penny I spent on it. I ended up doing a custom build and Andrew Meehan helped me out and was even looking at bike dimensions that competitive cycles doesn't sell when describing what I liked/didn't like about different bikes. He was also on the taller side of your typical rider which was very useful I highly recommend him for anyone help you need on a bike. If you have specific questions fire away. Final thought is this bike rocks! would buy again.

pretty awesome with a few flaws

    this bike is pretty epic to put it short, downside is there is no good way to carry a water bottle, there is technically a downtube spot but those are not very useful, the paint and quality is amazing, it comes with these clear stickers to put on the frame with no directions and they only last about a day or so before they peel off. would buy it again because its just simply amazing, only gave one star because of bottle cage placement, internal routing very easy to handle. bike performs perfectly

    Too much fun!!!

    • Familiarity: I've used it once or twice and have initial impressions

    As a whole, Yeti makes some of my favorite bikes and the SB4.5 is one of the most fun in their entire fleet. This 29er blended with 114mm of rear travel in the Switch Infinity suspension system make this one of the most versatile bikes of 2017. This thing can race XC and enduro with no problem, or can serve as your go-to everyday dirt crusher... there's a reason it's one of the most popular Yetis out there.

    Without an overbearing amount of suspension, this bike feels absolutely efficient on climbs and long, endurance oriented rides. However, if you're coming from a hardtail or strictly XC oriented bike, you'll notice that the head tube angle is slightly slacker. Because of this, you'll also notice its confident handling on the descents. Many people won't need anymore than the 114mm of rear travel, but if you're a trail ripper that tends to choose the gnarlier lines through rock gardens and prefers to push the limits of your suspension... you may want to check out the SB5.5

    With that being said, this bike holds plenty of suspension for the vast majority of riders and climbs very efficiently. The SB4.5 Turq is the higher end of the two carbon layups that Yeti offers for this model and is the only available for custom builds. This gives you the ability to get creative and really dial in the exact build that you'd like.

    I'm 5'9" and found the medium to fit me perfectly. Please feel free to reach out to me to discuss the many different build options available for the SB4.5 Turq!

    Avg. ride time: 9h 46m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Trail or XC or just all day fun

    • Familiarity: I've used it several times

    I ride road during the week and long marathon mtb rides on the weekends. After riding my 29er hardtail on everything from local So Cal trails, long drawn out climbs in the Cleveland National Forest, and pushing my limits on the trails in Sedona where I only saw one other hardtail on I decided I needed a trail bike that I could do 50+ miles on regularly and handle some chunky terrain.

    I demo'd a 4.5 and initially wasn't super impressed but I decided to pull the trigger anyway when they were clearing out the 2016s. I love building bikes from the wheels up and Zach Lassek helped me out a ton.



    Now about the bike. First time out I put about 30 miles on it with 5,000 feet of climbing with steep, and rocky descents in between. I immediately noticed the slack front end on the steep stuff and how well the suspension took the edge off rock gardens, and allowed me to pop the bike around in switchback and little jumps. KEEP IN MIND I'M COMING FROM A HARDTAIL. It didn't feel like I was using all the rear end suspension but after looking down I in fact did use it all. In comparison to an full suspension bike I had 2 years ago that had 140mm of travel in the rear I felt way more confident on the bike but did realize that there are limits to the rear suspension.



    Second outing worth mentioning was another 30 mile ride with 20 miles of fire road and a quick loose, rocky descent back. After my first outing I decided to put the suspension on firm and see how the bike handled. AMAZING. It made me understand why other people praise this bikes climbing ability. It felt like my hardtail with a longer front end.



    If you’re an xc, marathon, or road guy looking for a bit more bike than take my stamp of approval and do yourself a favor and treat yo’ self to a 4.5. If you’re a trail bro than this bike can be awesome if you aren’t looking to be the last one getting to the gnar and realize that there are limits to the rear suspension.

    Trail or XC  or just all day fun

    XC with an All Mountain Mentality

    • Familiarity: I've used it once or twice and have initial impressions

    Let me just start by saying... the 4.5 blew my expectations out of the water/(dirt)!



    I've heard from many of my clients and colleagues how capable this ride is, but after demoing it at the Moab Thaw the other weekend (1st trip down to southern UT this year! whoop whoop) I truly felt how capable and versatile it really is.



    With 140 mm of travel up front and 114 mm in the rear, the 4.5 is built to be an efficient XC machine with the ability to handle aggressive and burly terrain. I have to woefully admit, before hopping on to test it out I thought to myself, "I'm going to bottom this thing out within minutes." To my surprise, I couldn't have been more wrong. Where this bike shines is on the technical climbs, steep ascents and bumpy/rocky flowy trails. I wanted to test how the bike handled some drops and rowdier lines so went and did just that. The bike continued to shine even on those technical and rowdy descents. What Yeti has done with their Switch Infinity technology is truly impressive... The "translating main pivot" is especially advantageous on steep and rocky climbs and burly descents. The 4.5 handles just about everything you can throw at it.



    I have ridden a 29er since I got my first full suspension bike back in 2012 and have never looked back. With the advent of BOOST technology 29ers have now taken over (in my opinion) the xc/all-mountain/enduro scene.



    My only complaints with this build was the narrow feel of the handlebars and the lack of engagement of the DT swiss hubs. After a couple component swaps this build would be perfect!



    If you have any questions on this bike, a custom build variation of the 4.5 or anything else feel free to reach out to me directly and I'll get you all squared away.

    XC with an All Mountain Mentality