This is the size of the rear hub, which is wider than the other "boosts". You might say to yourself "to hell with all these new standards". But the context is broader than just "let's invent a new standard that people will have to buy":

The SuperBoost+157 uses a chainline developed for downhill bikes, but combined with a classic "trail" center and cranks. The existing Boost 148 standard moved the chain 3mm off the longitudinal axis of the bike (giving the rear tire +6mm of extra room). This is great for XC and 27.5" enduro bikes, but not enough for AM/Trail/EN 29ers (and 27.5+"). Hence the creation of the Super Boost+157. It allowed for a substantially shorter rear setup, giving the bike previously unattainable handling characteristics. It preserved the permeability of the massive tyres even in real traffic when they are covered in mud. 27.5+" will spin up to 3" tyres and 29" will spin with a 2.6" margin. The stiffness of the frame and the wishbones has been increased. The stiffness of the dropouts has been increased, which also puts it on par with the stiffness of the front Boost dropouts.
And we can elaborate even further.
Let's start with the idea: a high-stroke enduro bike that retains handling thanks to a short rear structure, while still having enough room for the rear tire when it gets covered in mud. It's important that the specification "tyres up to xxx width" is not just a marketing phrase, but works in the real world. And then, of course, there's the stiffness of the frame as a whole - another must. We all want a stiff bike.
A short rear structure with enough room for a wide tire is actually a contradiction in terms when using a virtual suspension system. That is, to get a wide tire close to the pedal center and still fit the suspension wishbones, you need the center as wide as possible. But you can't widen the centre indefinitely, because you're limited by the transducer and it just sort of has to be there.
Pivot has solved this by using the Super Boost Plus157 standard, i.e. a wide rear wheel axle, specifically 157mm (as opposed to 148mm of "standard" boost).
How is this related?
The wider rear axle allows the cassette and pinions to be moved further out from the longitudinal axis of the wheel. This also shifts the chainline, and therefore the derailleur can also be moved further out from the wheel. The result is more space at the pedal centre and with it enough room for a shorter and wider rear structure. In addition, you also get a more rigid dropout thanks to the wider rear hub. So all positive, right?
Maybe only with the Pivot, which doesn't compromise. A wide axle alone may solve one problem, but it creates another - namely a wide rear structure. The only way to manage this without the rider banging his heels into the frame or having his feet ridiculously far apart is with a pronounced profile. The most technologically complex and expensive solution, but the only one that leads to an uncompromising whole.
That's why the SuperBoost+157 standard axle, combined with the complex rear construction solution, puts the Pivot wheels a step ahead of the competition, because Pivot doesn't compromise.

In our shop you will find the Super Boost Plus hub from Trailmech, a company that produces original and uncompromisingly crafted hubs.
