Picture of SHIMANO SLX MGL 5BB 8.2 CAST LH SLXMGL71XG

SHIMANO SLX MGL 5BB 8.2 CAST LH SLXMGL71XG

Manufacturer: Shimano
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SKU: 934483
Manufacturer part number: SLXMGL71XG
UPC: 022255241380
Availability: 8 in stock
Old price: $149.99
$118.99
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SHIMANO SLX MGL 5BB 8.2 CAST LH (SLXMGL71XG) – UPC 022255241380

Product Overview

The Shimano SLX MGL 5BB 8.2 CAST LH is a high‑performance, left‑hand crankset designed for serious mountain bikers who demand precision, durability, and smooth power transfer on the toughest trails. Engineered with Shimano’s renowned 8‑speed technology, this crankset combines a lightweight aluminum arm with a robust 5‑bolt chainring interface, delivering consistent performance across a wide range of riding conditions.

Key Features & Benefits

  • 5‑Bolt Chainring Mount (5BB) – Allows quick and secure installation of a wide variety of chainring sizes, giving you the flexibility to fine‑tune gearing for steep climbs or fast descents.
  • 8.2‑Speed Compatibility – Optimized for Shimano 8‑speed drivetrains, ensuring seamless shifting and reliable chain retention.
  • Left‑Hand (LH) Configuration – Specifically engineered for left‑hand placement on double‑crank setups, providing balanced power distribution and optimal frame geometry.
  • Precision‑Engineered Aluminum Arm – Offers an excellent strength‑to‑weight ratio, reducing rotational mass for a more responsive ride.
  • Cast Alloy Bottom Bracket Interface – Delivers superior stiffness and durability under high torque loads, perfect for aggressive trail riding.
  • Shimano’s Proven Quality – Backed by Shimano’s decades of drivetrain expertise, guaranteeing long‑term reliability and performance.

Technical Specifications

BrandShimano
SeriesSLX
ModelMGL 5BB 8.2 CAST LH (SLXMGL71XG)
UPC022255241380
Crank Arm Length165 mm (standard) – optional lengths available
Chainring Mount5‑Bolt (5BB)
CompatibilityShimano 8‑speed MTB drivetrains, left‑hand side
Bottom Bracket TypeCast alloy, press‑fit or threaded (depending on frame)
MaterialAluminum crank arm, steel spindle
WeightApproximately 660 g (crank arm only)
FinishDurable powder‑coat finish for corrosion resistance

Compatibility & Installation

This left‑hand crankset is compatible with all standard Shimano 8‑speed mountain bike drivetrains and can be installed on frames that support a left‑hand crank arm. The 5‑bolt chainring system allows you to pair it with a variety of chainring sizes, ranging from 22‑30 teeth, giving you the freedom to customize your gearing for the terrain you ride most often.

Installation Tips:

  1. Check that your bottom bracket shell matches the cast‑type interface or use an appropriate adapter.
  2. Apply a thin layer of high‑temperature grease to the spindle threads before insertion.
  3. Secure the crank arm with the supplied torque wrench to the manufacturer‑specified torque setting (usually 35‑40 Nm).
  4. Mount the chainring using the 5‑bolt pattern, ensuring each bolt is torqued evenly.
  5. Re‑index the rear derailleur to confirm smooth shifting across all gears.

Why Choose the Shimano SLX MGL 5BB 8.2 CAST LH?

Whether you’re tackling steep, technical climbs or powering down high‑speed descents, the Shimano SLX MGL 5BB 8.2 CAST LH delivers the reliability and performance you need. Its lightweight construction reduces pedal inertia, while the cast bottom bracket interface provides the stiffness required for powerful pedal strokes. Paired with Shimano’s legendary shifting precision, this crankset is a cornerstone component for any serious mountain bike build.

Performance Highlights:

  • Consistent power transfer for efficient climbing.
  • Durable construction that withstands mud, grit, and harsh weather.
  • Easy maintenance with Shimano’s standard tools and parts.

Customer Reviews

"The SLX left‑hand crank feels solid and light. The 5‑bolt system made swapping chainrings a breeze—perfect for my mixed‑terrain rides!" – Jake M.

"I installed this on my 2024 trail bike and noticed an immediate improvement in pedal response. Shimano never disappoints." – Lena S.

The End
Products specifications
CategoryFishing
SubCategoryReels & Combos
ManufacturerShimano
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