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2016 Yeti SB5.5

2016 Yeti SB5.5

Size Tested: Medium

Geometry: (Here)
Build Overview:

  • Drivetrain: Stram X01
  • Brakes: SRAM Guide RSC
  • Fork: Fox 36 Factory FIT4
  • Rear Shock: Fox Float X Factory
  • Wheels: DT Swiss 350 / XM481

Wheels: 29′′

Travel: 140 mm rear / 160 mm front

Blister’s Measured Weight: 28.4 lbs (12.9kg) without pedals

Reviewer: 5’9”, 155 lbs.

Test Location: Montana, British Columbia

Duration of Test: About 2 months

MSRP: $6,999.00

Noah Bodman reviews the Yeti SB5.5 for Blister Gear Review.

Yeti SB5.5

The Yeti SB5.5, released last spring to much internet bed wetting, is Yeti’s longest travel 29er. The only longer travel bike in Yeti’s current lineup is the SB6 (which runs on 27.5” wheels).

It’s been a while since I’ve spent much time on a Yeti, and this was my first opportunity to ride one of the latest SB bikes that have Yeti’s new Switch Infinity suspension design. And I’ll admit to being slightly skeptical about the new design, as I often am about linkages that are new and different. But maybe more than any other bike brand, Yeti has a loyal cadre of followers, and the brand has a long history of winning races that doesn’t appear to be letting up any time soon. So maybe all these people know something I don’t, and maybe my skepticism is unfounded.

I’ve spent the last two months or so on the SB5.5, and I’ve arrived at a tentative conclusion. I think this is the fastest bike I’ve been on to date.

Frame

The SB5.5 is only available with a carbon frame, and Yeti has recently released their 2017 lineup which sees the SB5.5 come in two flavors – “Carbon” and “Turq.” The new Carbon version is essentially the same as the 2016 model that I rode, while the “Turq” version uses a higher end, lighter weight carbon layup (but geometry and frame details are the same).

The heart of the SB5.5, along with all of Yeti’s full suspension bikes, is their Switch Infinity system. It looks kind of complicated, but in reality it’s fairly straight forward.

Yeti SB5.5 Switch Infinity

Yeti SB5.5 Switch Infinity

In terms of the basic suspension layout, I like to think of the Switch Infinity system as a modified single pivot. Those little sliders allow the main pivot to move up and down a little bit (they only move about 1.5 cm’s through the entire arc of the travel), which in turn allows Yeti to place a swing link near the shock.

That swing link is key, and does a couple things. First, it substantially stiffens up the rear end – rather than all of the forces being focused on the main pivot, they’re spread between the main pivot and the swing link. Second, the swing link allows Yeti to dictate the suspension kinematics much more precisely – the leverage rate and anti-squat curve, both of which have a big impact on how the suspension moves, can be dialed in by adjusting the size and position of that swing link and its relation to the Switch Infinity sliders.

Noah Bodman reviews the Yeti SB5.5 for Blister Gear Review.

Noah Bodman on the Yeti SB5.5.

All that suspension is running on high quality pivots – a collet system helps keep everything snug, and the SB5.5 has nice, custom hardware. In my time on the bike, all the pivots stayed tight and everything is still spinning smoothly.

Cable routing is internal, running through small rubberized ports to help keep the elements out. There isn’t any internal piping in the frame, so running cables on the SB5.5 is a frustrating exercise that requires magnets, swearing, and strong temptations to cut larger holes into your expensive frame. Yeti’s new SB5 frame incorporates a larger port to make this task easier, so hopefully Yeti will incorporate something similar on the SB5.5 in the future.

The rear axle is from Shimano – nothing exotic, but it works well and it’s reasonably low profile. The drive side dropout and derailleur hanger are a single aluminum piece that’s replaceable in case you crunch a derailleur or bung up the axle threads.

The frame gets a small rubberized guard on the downtube as well as some protection on the chainstay. Again, nothing too crazy, but it gets the job done and looks cleaner than most integrated guards I’ve seen.

My biggest gripe about the frame is the lack of a good water bottle mount. There’s one mount on the underside of the downtube which is better than nothing, but it’s a crappy place for a water bottle. And I mean that in a literal sense, since I occasionally end up with horse droppings on my bottle.
NEXT: The Build, Fit and Geometry, Etc.

3 Comments

  1. Brian Williams October 13, 2016 Reply

    Thanks for calling out and articulating the seat tube angle issue, which as you mention is one of the most important factors for climbing on a long travel bike. We have reach and stack to accurately define hand and front wheel position but “effective seat angle” is a shot in the dark that’s interpreted differently by each manufacturer. Hopefully some will start to listen.

    Cheers

    BW

    • Dave March 24, 2017 Reply

      This is a huge problem for taller riders. Many bikes just don’t work for them on climbs because they have too slack seat tube angles paired with short chainstays. When the seat tube is fully extended, for optimal climbing condition, weight balance gets all wrong. Bikes with a big kink in the seat tube, very slack real STA, have real world ESTAs much slacker then claimed. I seriously doubt that 2017 29er Trek Slash works for taller guys. On climbs that is.

      Speaking of Evil. They actually changed their official reported ESTA on The Insurgent from the bikes inception, making them slacker. If you bother to calculate you will see that their geometry numbers don’t add up.

  2. Rob Nowakowski October 21, 2016 Reply

    Of note, my Santa Cruz Hightower setup with a 160 36 on the front and Float X2 rear has numbers almost identical to the Yeti 5.5, although slightly shorter chainstays. I’ve found very much the same thing coming off my previous Nomad 3, all my Strava DH times in Western Canada terrain have come down without trying as hard.

    Those of us that have tried the longer travel 29ers in my crew really think we’ll see more and more in this Enduro segment as the speed advantage seems to be a reality for most people. Interesting also to follow along on EWS setups on the few teams that have equivalent choices in 27 and 29 and ultimately what they choose. Except for Rude boy, most seem to be going the 29 route.

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