Oval Boost for Shimano DM 12sp MTB

Chainring 1-speed direct mount narrow-wide Oval for Shimano DM 12sp MTB Boost ELM 3 mm offset

Size: 26T
Color: Black


Processing time: up to 10 business days


Shipping time: 2 to 7 business days. Provided by FedEx

  Return Policy

You can return an unused product within 30 days

The original design ALUGEAR chainring “ELM”



  • Offset: 26T-38T  3,0mm; 40T-42T  2,0mm

  • Chainline: 26T-38T  52,0mm; 55,0mm; 56,5mm (depending on used crank)

  • Weight: 26T- 46g; 28T- 51g; 30T- 57g; 32T- 62g; 34T- 69g; 36T- 73g; 38T- 79g; 40T- 83g; 42T- 86g

  • Diameter: 26T- 120mm; 28T- 128mm; 30T- 136mm; 32T- 144mm; 34T- 152mm; 36T- 162mm; 38T- 170mm; 40T- 178mm; 42T- 186mm

  • Timing: 108° (top dead center)

  • Ovality: 12%

  • Material: 7075-T6 aluminum

  • Made: CNC milling

  • Surface coating: Anodizing



  • For Shimano Direct Mount 12 speed cranksets: XTR M9100/9120/9125/9130, XT M8100/8120/8130, SLX M7100/7120/7130, Deore M6100/6120/6130, MT900, MT610

  • Cranksets M9100/9120, M8100, M7100, M6100, MT900, MT610 will use with a Boost chainring (3mm offset), and it is compatible with 142 mm or 148 mm O.L.D. frames

  • Cranksets M9125, M8120, M7120, M6120 have a longer spindle and also use a Boost chainring (3mm offset). It is compatible with 148 mm O.L.D. frames

  • Cranksets M9130, M8130, M7130, M6130 have an even longer spindle and also use a Boost chainring (3mm offset). These cranks should use with 157 mm O.L.D. frames

  • MTB chainrings you may use the following chains: all 10sp; 11sp; 12sp Shimano Hyperglide+ and 10sp, 11sp, 12sp SRAM



ALUGEAR chainrings are some of the lightest chainrings on the market. Using our experience and vigorous testing, we tweaked the arm design and strategically machined the chainrings so that only minimal sacrifices were made in impact strength in exchange for large gains in weight reduction

The chainrings are CNC machined from 7075 T6 aluminum and hard coat industrially anodized to provide protection from mechanical impacts, a good look, and an excellent tactile feel to each of the chainrings that lasts a long time

A unique tooth profile eliminates chain noise, reduces wear, and provides smooth operation on the entire system of all the most common combinations, such as 10, 11, and 12-speed drives. The Narrow Wide teeth guide the chain reliably

The tooth profile is specially designed for use with MTB chains.

ALUGEAR chainrings are the best choice if you are looking for a technologically sound chainring with a unique design and low weight



  • We recommend the use of a clutch system rear derailleur for the best chain security

  • It is also a good idea to use a new chain with your new ALUGEAR chainring


Data sheet

Shimano XTR M9100, XT M8100 / 8120 single and double cranks, SLX M7100 / 7120, MT900 crank
3 mm
Direct Mount
for Shimano DM 12sp

Specific References

  • Register

New account register

Already have an account?
Log in instead Or Reset password