Round AERO for 104 BCD MTB

Chainring 1-speed narrow-wide Round for 104 BCD MTB AERO (for QUARQ)

Size: 32T
Color: Silver

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Processing time: up to 9 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 



  • Weight: 32T- 38g; 34T- 46g; 36T- 54g; 38T- 61g

  • Diameter: 32T- 138,6mm; 34T- 148mm; 36T- 154,2mm; 38T- 161,3mm

  • Material: 7075-T6 aluminum

  • Made: CNC milling

  • Surface coating: Anodizing



  • For PowerMeters: SRAM Quarq Eagle Spider 104 mm BCD 4-bolts

  • Compatible with all common cranks that have a 104 BCD 4-arm bolt circle diameter

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



The ALUGEAR AERO chainrings 104BCD are compatible with QUARQ SRAM Eagle, SRM Origin MTB or other 104BCD cranks. It's compatible with SRAM Eagle 12s (XX1, X01, GX, NX & SX) and Shimano Hyperglide + 12s chains (XTR, XT, SLX, Deore). Compatibility with 11-speed chains is also guaranteed. It is attached to the PowerMeters or spiders with 4 pieces of nuts and bolts with a thread length of 6,5 mm

The chainrings are characterized by a quiet running of the chain and good self-cleaning in muddy conditions. With the alternating narrow wide tooth profile, which is matched to the bicycle chains, the chainrings keep the chain always securely in place. The chainrings are available with 32 to 38 teeth

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 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



  • Use Bolts and Nuts for mounting: 5mm Nuts and 6,5mm Bolts are required

  • Tool holder: Nut 6 mm and Bolt 5 mm hexagon socket, maximum permissible torque: 12 Nm

  • We recommend the use of an increased cage tension system rear derailleur for the best chain security

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

  • It is recommended to use a well-lubricated chain on every ride




Data sheet

For all cranksets with a mounting type 104 BCD and SRAM Quarq AXS Powermeter Spider 104 mm BCD 4-bolts
for 104 BCD

Specific References


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