This is the SRAM Red DUB 2x E1 Crankset Chainring Combo, Speed 12, Spindle 28.99mm, BCD Direct Mount SRAM 8 Bolt.

This is the lightest and stiffest crank ever.  A new optimized layup drops further grams from our hollow carbon arms, and to stay on top of current fit trends we’ve added our first carbon 160mm crankarm length option. 

The X-Range gearing keeps your cadence change during a front shift to the minimum, maximizing your ability to put power down.

Features:

• Optimized layup drops further grams from the hollow carbon arms
• X-Range gearing minimizes cadence change during a front shift
• One-piece 2x chainring results in a lighter weight, stiffer, more durable crankset
• 29 g lighter than the previous generation
• Crisp and accurate front shifts
• Ultra-light hollow carbon fiber crankarms
• DUB bottom bracket adds durability and simplicity
• Can be upgraded to a power meter
• 50/37T, 48/35T and 46/33T chainring combos available
• Available in 160, 165, 167.5, 170, 172.5, and 175 mm lengths
• SRAM Model ID: FC-RED-E1

Product Specifications:

• Speeds    12
• BB Compatibility    All SRAM Road DUB BBs
• Chainring Size    46/33T, 48/35T, 50/37T
• Crank arm length    160mm, 165mm, 167.5mm, 170mm, 172.5mm, 175mm
• Chainline    45.0mm
• BB Spindle Interface    DUB
• Crankset material    Carbon
• Chainring material    Aluminum
• Bolt Circle Diameter (BCD)    Direct Mount (DM)
• Power meter    No
• Power Meter Type    n/a
• Chain Technology    Road Flattop D1, Road Flattop E1
• Drivetrain Configuration    2x
• Technology (FD)    Road-Yaw
• Front Tooth Jump    13
• Weight (g)    545
• Weight Based On    172.5mm length with 48/35 chainrings

Vendor Item No:

• 00.6118.683.000 (Crank Arm Length 160mm, 50/37T) 
• 00.6118.683.001 (Crank Arm Length 165mm, 50/37T)
• 00.6118.683.002 (Crank Arm Length 167.5mm, 50/37T)
• 00.6118.683.003 (Crank Arm Length 170mm, 50/37T)
• 00.6118.683.004 (Crank Arm Length 172.5mm, 50/37T)
• 00.6118.683.005 (Crank Arm Length 175mm, 50/37T)
• 00.6118.683.006 (Crank Arm Length 160mm, 48/35T)
• 00.6118.683.007 (Crank Arm Length 165mm, 48/35T)
• 00.6118.683.008 (Crank Arm Length 167.5mm, 48/35T)
• 00.6118.683.009 (Crank Arm Length 170mm, 48/35T)
• 00.6118.683.010 (Crank Arm Length 172.5mm, 48/35T)
• 00.6118.683.011 (Crank Arm Length 175mm, 48/35T)
• 00.6118.683.012 (Crank Arm Length 160mm, 46/33T)
• 00.6118.683.013 (Crank Arm Length 165mm, 46/33T)
• 00.6118.683.014 (Crank Arm Length 167.5mm, 46/33T)
• 00.6118.683.015 (Crank Arm Length 170mm, 46/33T)
• 00.6118.683.016 (Crank Arm Length 172.5mm, 46/33T)
• 00.6118.683.017 (Crank Arm Length 175mm, 46/33T)