Forged and CNC-Machined, Not Just Machined from Stock

The SL1 arms start from a forged 6061-T6 aluminum blank rather than bar stock, giving the crank arm a stronger internal grain structure for high stiffness and crack resistance under hard pedaling — the factory quotes roughly 15% lower weight and 20% higher stiffness.

Gap Adjustment Ring

A preload adjustment ring on the non-drive arm takes up the play between the crank and the bottom bracket, then locks in place with a small pinch bolt — so the crankset spins freely without side-to-side movement.

DUB 28.99mm Spindle

The spindle follows the SRAM DUB standard, so it works with DUB bottom brackets as well as the EVOSID threaded bottom bracket offered below.

One Piece of CNC 7075 Aluminum, With Shift Ramps

Both rings are CNC-machined from a single piece of 7075 aerospace-grade aluminum and finished in sand-blasted anodized black, staying rigid without the extra hardware of two separately bolted rings. Dedicated tooth profiles and chain-guide ramps on the big ring catch the chain cleanly as it climbs from the small ring, and width-optimized tooth tips reduce chain and ring wear. The factory rates the ES1204 for 8 to 12-speed drivetrains.

50-34T

The easier-spinning ratio — more manageable on long climbs and rolling terrain.

Chainring weight: 169g

52-36T

A taller top end for faster group rides and flatter routes.

Chainring weight: 170g

EVOSID BC1.37"×24T Threaded Bottom Bracket

A BSA (English) threaded bottom bracket for DUB spindles. Overall width is 90mm and it fits bottom bracket shells from 68mm to 73mm wide, with spacers included (two 2.6mm, one 3mm and one 4.5mm) to take up the difference. Threading directly into the shell avoids the creaking press-fit bottom brackets are known for.

×1 pair

EVOSID SL1 Crank Arms (length as selected)

×1

EVOSID ES1204 Double Chainring (fitted, as selected)

×1

EVOSID BC1.37"×24T Bottom Bracket + Spacers

Check Your Bottom Bracket Shell

The included bottom bracket fits BSA (English) threaded shells 68-73mm wide. It is not a press-fit design. If your frame uses a press-fit or other shell standard, this bottom bracket won't fit, so you'll need a DUB bottom bracket made for your frame.

A Front Derailleur Is Required

This is a double crankset, so your bike needs a front derailleur and a 2X shifting setup to move between the two rings.

Pedals Not Included

Pedals are sold separately.