# e*thirteen Helix Race Alloy e*spec Crank Arm Set - BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset 165mm Self Extractor Silver

A high-performance weight-optimized alternative to carbon fiber for riders who prefer alloy cranks. These 24mm ISIS interface cranks are engineered for compatibility with Bosch Gen 4 Brose S Mag TQ HPR 50 Fazua Yamaha Maxon and Specialized Brose motor systems. They come in short lengths starting at 155mm for improved pedal clearance and are tested to E-Enduro standards.

Color

Silver

Crank Length (mm)

165

Pedal Spindle

9/16"

Spindle Interface Type

ISIS

Designed for ebike

Yes

Defined Color

Silver

## Details

- **Price:** 219.95 USD
- **Vendor:** Gio's Outdoors
- **Type:** Cranksets and Arms
- **Tags:** Gio's Outdoors, Shopify Collective

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 219.95 USD | In stock |

## Images

- e*thirteen Helix Race Alloy e*spec Crank Arm Set - BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset 165mm Self Extractor Silver

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> Source: [Smart supply deals](https://smartsupplydeals.com/products/e-thirteen-helix-race-alloy-e-spec-crank-arm-set-bosch-sx-brose-s-mag-tq-hpr50-21-5mm-offset-165mm-self-extractor-silver)
> Updated: 2026-07-22