Absolute Black

SRAM BOOST Direct Mount Chainrings

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  • MSRP $67.99


Premium 1X Sram Direct-mount Oval Boost148 compatible traction chainrings. Fits SRAM and other Boost148 cranks. Also replaces 76bcd chainrings to convert to a direct-mount design.

Size (Mass +/-1g):

28T (50g), 30T (55g), 32T (59g), 34T(66g)

Color

Oval: Black, Green, Gold, Red

Round: Black

Compatibility

Compatible with Boost148 Style cranks/bikes

Material

CNC machined 7075 Txxx Aluminum.

Finish

type II anodizing

Chainline

50mm

Ovality

Optimized per individual chainring size. Range: 10.2-14.4% and Timing of 110.5-116.3 after TDC (top dead center) Patent Pending

 

Advantages of our direct-mount oval chainrings:
  • Finest design to provide excellent strength to weight ratio
  • Patent-Pending oval shape
  • Unique Patent Pending narrow-wide tooth profiles to keep your chain in place even in aggressive conditions
  • Special 3D teeth machining for ultimate mud relief, decreased wear and noise
  • Designed to handle the rigors of mud and grass
  • Lower weight by reducing the need for a spider and chainring bolts
  • Superb quality and look.
  • Riders will not "feel" the oval shape
  • Improves traction and climbing abilities
  • Reduces knee stress

HOW TO MOUNT OUR OVAL CHAINRING TO SRAM GXP AND BB30 CRANK:

You need to unscrew these 3 torx t-25 bolts from the crank. Then remove the spider+chainring combo you currently have there. Clean the splines and put some grease on them. Position the chainring in place (note there is only one way to fit this chainring to Sram crank, so you don't have to worry how to do it). Close all 3 bolts to about 5-7Nm.

 

Check below which Sram compatible oval narrow wide chainring you will require for your Sram crank type. All Sram Cranks have exactly same mounting interface regardless the model or axle type. The only thing you need to determine is chainring offset.

Which sram chainring should you choose

 

BB30 sram chainrings and axles explained

It is ideal for 1x 9/10/11/12 system and Singlespeeds!. Oval (elliptical) chainring does not compromise the work of clutch mechanism in rear derailleur(video at the bottom). It also does not require chain tensioner when using in singlespeed application. Riding out of saddle on the uphill will become more pleasant. These chainrings also help you to recover after knee injuries as pedaling becomes smoother and less exhausting. It is the most advanced oval chainring currently on the market.

The most advanced, Patent Pending alternate wide and narrow teeth profile currently produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.

The World's best oval (elliptical) mtb spiderless traction chainring - period!. Non circular chainrings, Non-round chainrings. Asymmetrical chainrings.

Designed in UK. Manufactured in Poland (EU).

Chain options

10, 11 or 12spd chain for geared bike or 6-8 spd for SS. If used in 1x9 drivetrain - 10spd chain must be used to obtain the performance. (yes - 10spd chain will work great on 9spd cassette)

Chainguide needed?

No. But if you want one then chain guide should have 2 teeth more capacity than nominal oval ring size.

 

NOT CONVINCED YET? READ REVIEWS

OVAL rings - unfair advantage in singlespeed? MTBR forum reviews.

oval rings bikerumor
Absolute Black Ovalized Wide Narrow Chainrings - bikerumor 

SRAM, GXP, Eagle and XX1 are trademarks of SRAM LLC and are used for informational purposes only.


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