SRAM Backs New Boost 148 Standards

Words by Flow, SRAM | Images by SRAM

It looks like 2016 will be a year filled yet again with news of bike and component manufactures keeping up with new standards. SRAM have announced complete support of the Boost system. We feel that the dust has just settled with the wheel size debates. So what is Boost all about?

With the arrival of Boost spec components, we will now see wider spaced hubs on bikes to increase stiffness in the wheels. Trek initiated the whole movement this year with their Remedy 29er, using a 148mm wide rear hub on the bike (current standard is 142mm wide). Wider flanges on hubs will give the spokes a stronger stance, hence a stiffer wheel.

It’s said that a 29″ wheel with Boost 148 is just as stiff as a 27.5″ wheel.

To accommodate for a wider rear hub, the chain line is shifted outwards 3mm via a new chainring.

And up front a new hub spacing rounds out the Boost system. 10mm wider, using a new fork and hub to achieve a stiffer wheel.

Our thoughts? If this is in all aid of a stiffer 29er wheel, and the ability to run wider tyres, could this have been achieved any other way? Let’s see how it all pans out, if SRAM are backing the new standard that Trek seem to have let the licence available to all, maybe the improvements will be worth the hassle and confusion that comes along with the addition of a new standard.

Read on to hear SRAM’s take.


For a long time now, SRAM had been looking for a way to open up more room around the crankset for frame designers to further optimise their bikes.

SRAM 1x™ was the first step in this direction by eliminating the need for a front derailleur. However, SRAM also had hopes to move the chain line outboard as well. It wasn’t until an OE came to us with a similar goal that we were able to realise this hope.

SRAM_MTB_X0_Hub_Rear_Red_print copy

Boost 148 means wider spaced hubs and chainrings.

Screen Shot 2015-03-18 at 3.17.50 pm

Boost spec means the chain line shifts out 3mm.

Boost 148 compatible cranks provide increased clearance, which allows more options for tire choice and rear-end designs.

SRAM_MTB_XX1_Crankset_DM_ChainRing_Side_Red_MH

Cranks remain primarily the same, it’s the chainring that is moved 3mm out to give the chain a straighter path to the cassette which will sit further outboard.

Boost is a new wheel and drivetrain specification that provides:

  • Increased wheel stiffness and durability
  • Better riding efficiency and bike handling precision
  • Improved frame geometry with shorter chain stays
  • Wider and stiffer suspension pivots
  • Wider range of chainring options
  • More clearance for bigger tires
Screen Shot 2015-03-18 at 2.47.00 pm

The Boost system uses a front hub that is 10mm wider than a 100mm design

Each flange is 5mm farther from centre. The greater flange offset allows a stronger spoke-bracing angle resulting in a stiffer wheel.

Given the same rim and spoke spec, a 29” wheel built with a 15×110 Boost hub becomes as stiff as a 26″ wheel built with a standard 15×100 hub.

ROCKSHOX WILL OFFER BOOST 110 COMPATIBLE MODELS OF ITS MOST POPULAR FORKS:

• Available option for MY16 SID, REBA, PIKE

• All 29″ forks with Boost 110 compatibility also fit 27.5″ plus (27.5″ x 3.0 +tires)Screen Shot 2015-03-18 at 2.46.48 pm

REAR WHEELS

Much more than a new, wider axle standard, the Boost system uses a rear hub that is 6mm wider than a 142mm design—each flange is 3mm farther from centre.

The greater flange offset allows a stronger spoke bracing angle resulting in a stiffer wheel. Given the same rim and spoke spec, a 29″ Boost wheel will have the same stiffness as a 27.5″ wheel built on a 142mm hub.

Boost technology is available in ROAM 40 wheels

as well as X0 and MTH 700 Series hubs

AVAILABLE BOOST WHEELS

• ROAM 40 (27.5″, 29″)

AVAILABLE BOOST HUBS

• X0

• MTH 746/716

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