What Is Boost Spacing In Mountain Bikes?

What Is Boost Spacing In Mountain Bike? – [Complete Guide]

I’ve tried a lot of different techniques and modifications to improve my mountain biking, but nothing has made as big of a difference as Boost spacing.

In the past few years, the mountain biking industry has made advancements in the field.

Among other advancements and developments, boost spacing in modern mountain bikes has become popular.

Hub spacing can be confusing in different aspects these days. But mountain bikers who prefer stability, rigidity, and speed most likely choose to enhance boost spacing on their bikes.

So the main question is whether to boost the space of your mountain bike or not. To clarify your confusion, we’ve compiled a comprehensive detail about boost spacing in mountain bikes.

Read on to find out what boost spacing is in mountain bikes.

What Is Boost Spacing In Mountain Bikes?

boost spaciing in mountain bike

One of the most recent developments in mountain biking is the switch to “Boost” hub spacing. Boost spacing, which was first used in 2015, is often referred to as:

  • Chainring/chaining of 52mm measured from the center of the bottom bracket shell
  • 148mm rear hub spacing with a 12mm rear axle
  • 110mm front hub spacing with a 15mm front axle

Boost spacing makes it possible to have wider hub flange spacing, which, when making wheels, translates to a superior spoke bracing angle and dish (this makes the wheels stronger).

The rear cassette and the brake rotor are 3 mm more forward than they were previously.

When attempting to jam large tires, wide-range 12-speed cassettes, and ultra-short chainstays into the same highly cramped real estate, boost also pushes the chain line somewhat outboard, which helps lessen chain/tire interference.

Boost also makes the chainlink slightly more horizontal.

The Advantages Of Boost Spacing On Mountain:

One benefit of the new, wider axle standard is immediately app that the wheel’s rigidity and stability are much improved due to the wider hub flange and the more vital spoke-bracing angle.

Manufacturer statistics show that a 29-inch rear wheel with a 148mm hub is equally rigid as a 27.5-inch wheel with a 142mm hub. But as SRAM asserts, Boost offers further benefits.

  • Because of the larger rear wheel, a shorter chain stay can be utilized.
  • Suspension pivots can be set farther apart, which results in enhanced rigidity.
  • The wider rear hub gives you more options when it comes to chainrings.
  • Boost spacing allows for greater compatibility with different tire and rim sizes, giving you more options for customizing your mountain bike setup.
  • Finally, Boost spacing can result in a stiffer frame and fork, as the wider hub spacing allows for larger, stronger axles and a more robust overall design.

Is It Worth Buy A Boost Spaced Mountain Bike?

Yes, to answer briefly. Boost width hubs contribute to the strength and stiffness of wheels, forks, and frames, resulting in a much more predictable bike.

You’ll notice the difference immediately if you ride two bikes with comparable equipment, but one has Boost and the other without, especially at the front end.

boost spaciing in bike

Despite the happily decreasing use of QR wheels, normal-width hubs are still present on many less expensive bikes with bolt-through axles.

However, they are fine since we were all riding them with pleasure back in the days before Boost. However, if your budget lets it, we advise choosing a bike with Boost.

What Are The Alternatives Of Boost Spacing In Mountain Biking?

Super Boost:

It makes the rear hub wider, at 157mm, allowing the spokes to rest at better angles for higher lateral rigidity.

However, only a few trail bikes from smaller manufacturers now have this feature. However, it’s likely a matter of time until it succeeds since major fish like Trek use 157mm on downhill bikes like the Session.

To further complicate things, note that the hub geometry differs between the Super Boost and the downhill 157mm width.

Ai (Asymmetric Integration):

Cannondale has developed its solution to the issue that asymmetrical spoke angles are naturally less stiff, constructed the wheel to be more symmetrical, and designed the frame to be asymmetrical.

An intrinsically stronger wheel may fit thanks to the company’s unique Ai (Asymmetric Integration) design, which includes sticking one chainstay out wider than the other.

Of course, the drawback is that there aren’t many options for good wheels if you wish to replace or enhance them.

When you’re in riding conditions like these, you want your bike to be as dependable and predictable as possible!

boost spaciing


MTBs with boost spacing is more stable while off-roading, making it simple to mount plus-sized or fat tires.

Nowadays, practically all mountain bikes have Boost spacing, except inexpensive bikes. Purchasing a mountain bike with Boost space is preferable if you like off-road riding.

However, if you mostly bike on the street, it won’t matter.

Additionally, if you want to modify your bike in the future, you should get a mountain bike with boost space since it will be simpler to obtain components for them.

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