SHIMANO Y1RL98010 Deore Xt Left Crank Arm 689228677869 FC-M8000/T8000 170MM

( Brand: Shimano ), ( Manufacturer Part Number: Y1RL98010 ), ( Part Type: Hand Crank ), ( Crankarm Length: 170 Mm ), ( Manufacturer Warranty: 2 Years ), ( Color: Black ), ( Compatible Bike Type: Universal ), ( Material: Aluminum ), ( Country Of Origin: Japan ), ( UPC: 689228677869 )

Review SHIMANO Deore Xt Fc-m8000/t8000 Left Hand Crank Arm 170mm

The **Shimano Y1RL98010 Deore XT FC-M8000/T8000 Left Crank Arm (170mm)** is a precision-engineered component designed to deliver uncompromising performance and durability for cyclists seeking a seamless riding experience across a wide range of terrains. Part of Shimano s renowned Deore XT lineup, this crank arm is crafted to meet the demands of modern mountain biking and gravel riding, where reliability and efficiency are paramount. The **170mm length** strikes an optimal balance between power transfer and pedal clearance, making it ideal for riders who prioritize both climbing efficiency and aggressive descents. Constructed from high-strength aluminum, the crank arm is lightweight yet robust, ensuring it can withstand the rigors of rough trails, technical descents, and repeated high-stress pedaling without compromising structural integrity.

At its core, the **FC-M8000/T8000** series leverages Shimano s advanced **Hollowtech II** technology, which integrates a **12mm through-axle** for enhanced stability and reduced wobble, particularly beneficial on dropper post setups or when paired with modern suspension forks. The **left crank arm** features a **right-hand thread (RHT)** for secure mounting, ensuring a tight, vibration-dampening fit that minimizes energy loss during pedaling. The **spindle interface** is meticulously machined to accommodate Shimano s **8-speed cassette systems**, providing smooth, precise shifting whether you're navigating a singletrack climb or bombing down a technical descent. The **integrated chainring bolt** is designed for quick and easy adjustments, allowing riders to fine-tune chainline alignment with minimal fuss, a critical factor for maintaining optimal drivetrain efficiency.

Shimano s **Deore XT** branding signifies a blend of performance and value, offering components that are slightly more refined than the base Deore series while remaining accessible for riders who demand reliability without the premium price tag of higher-tier models like the SLX or XT. The **left crank arm** is engineered to pair seamlessly with its right-hand counterpart (Y1RL980010), ensuring symmetrical performance and balanced weight distribution. Whether paired with a **1x8 or 1x9 drivetrain**, this crank arm excels in reducing rotational mass while maintaining rigidity, which translates to quicker acceleration and improved handling key advantages for riders who demand responsiveness in both climbing and descending scenarios.

Beyond its technical specifications, the **Y1RL98010** is a testament to Shimano s commitment to innovation in drivetrain design. The **Hollowtech II** spindle not only reduces weight but also improves pedal stroke efficiency by minimizing friction, allowing riders to transfer more of their effort directly into forward motion. The **170mm length** is particularly well-suited for riders with a moderate Q-factor, offering a natural pedal position that reduces knee strain during prolonged rides. Additionally, the **durable anodized finish** provides corrosion resistance, ensuring longevity even in harsh conditions where salt, mud, or moisture might otherwise compromise performance.

For cyclists who demand a balance of strength, precision, and versatility, the **Shimano Y1RL98010 Deore XT FC-M8000/T8000 Left Crank Arm (170mm)** is an exemplary choice. Whether integrated into a full-suspension mountain bike, a hardtail rig, or a gravel-focused setup, this crank arm delivers the reliability and performance needed to tackle everything from technical singletrack to rough-and-tumble gravel roads. Its seamless compatibility with Shimano s broader drivetrain ecosystem ensures that riders can upgrade or customize their setup with confidence, knowing that every component is designed to work in harmony for an optimal riding experience.

### **Pros and Cons of buying a Shimano Y1RL98010 (Deore XT FC-M8000/T8000 Left Crank Arm, 170mm)**

1. **High Performance and Reliability** The Deore XT (XT-M8000/T8000) drivetrain is one of Shimano s most capable mid-range groupsets, offering smooth shifting, durable components, and strong chain retention. The Y1RL98010 is a left-side crank arm designed for this system, ensuring compatibility with other XT parts.

2. **Durability** Shimano s XT components are built for endurance, making them suitable for both road and light gravel riding. The crank arms are made from forged aluminum, which resists fatigue better than cast alternatives over time.

3. **Compatibility with Full Suspension** The 170mm length is standard for most modern mountain bikes, ensuring proper chainline alignment with most frames and forks. This makes it a versatile choice for trail, enduro, or cross-country bikes.

4. **Lightweight** While not as ultra-light as carbon cranks, the forged aluminum construction keeps weight reasonable ( 200 250g per crank arm), which is acceptable for most riders without sacrificing performance.

5. **Easy Maintenance** Shimano s XT components are widely available for repairs and upgrades. Spare parts, tools, and service knowledge are readily accessible, reducing long-term costs.

6. **Cost-Effective Upgrade** If you already own or plan to buy other XT components (e.g., derailleur, cassette, chain), this crank arm is a logical addition without breaking the bank.

7. **Proven Design** The FC-M8000/T8000 platform has been refined over years of use, with improvements in shifting consistency and durability. It strikes a balance between performance and affordability.

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1. **Not Entry-Level** While XT is more affordable than top-tier groupsets (e.g., Ultegra, Dura-Ace), it is still a mid-range option. If you re on a tight budget, cheaper alternatives (e.g., Deore SLX or older Deore) may suffice for casual riding.

2. **Weight Compared to Carbon** For aggressive riders or those seeking maximum efficiency, carbon cranks (e.g., SRAM s NEX or Shimano s PD-M9000) are lighter and stiffer. However, the difference may not be noticeable to most riders.

3. **Limited Customization** Unlike some high-end cranks, the XT crank arm doesn t offer bolt-on weight savings (e.g., hollow crank arms) or customizable bottom bracket spacing. If you need specific adjustments, you may need to source aftermarket parts.

4. **Potential for Wear Over Time** While durable, XT components will eventually wear out, especially the chainrings and bottom bracket. Replacement costs add up over the bike s lifespan, though this applies to all groupsets.

5. **No Hydraulic Disc Brake Compatibility (If Not Already Paired)** If your bike lacks hydraulic disc brakes, you ll need to ensure the rest of the drivetrain (e.g., derailleur, cassette) is compatible. The XT-M8000/T8000 works well with hydraulic setups, but this is a separate consideration.

6. **Market Availability** While widely available, some Shimano parts can be harder to find in certain regions or during supply chain disruptions. Always check stock before purchasing.

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The **Shimano Y1RL98010 (Deore XT FC-M8000/T8000 left crank arm, 170mm)** is a solid, reliable choice for riders who want a balance of performance, durability, and affordability. It excels in compatibility with the XT drivetrain, ease of maintenance, and long-term usability. However, it may not be the best option for riders prioritizing ultra-lightweight components or those on a very tight budget.

If you re building or upgrading a bike with the **XT-M8000/T8000 groupset** and need a left crank arm, this is a **highly recommended** part. For casual riders or those on a budget, a Deore SLX or older Deore crank might be sufficient. For performance-focused riders, consider carbon cranks if weight is a priority.

- You re using or upgrading to the **XT-M8000/T8000 drivetrain**.

- You need a **durable, reliable crank arm** for trail or enduro riding.

- You want **easy maintenance and part availability**.

- You re okay with the **weight and cost** of a mid-range groupset.

- You re on a **very tight budget** (e.g., Deore SLX or older Deore).

- You prioritize **ultra-lightweight components** (e.g., carbon cranks).

- You need **custom spacing or bolt-on weight savings** (e.g., hollow cranks).

For most riders building or upgrading an XT-equipped bike, this crank arm is a **wise and practical purchase**.

Details:

Used crank has normal wear, 170mm length .

part #: y1rl98010 prices

• $83.59-$94.91

specifications ribicycl:

• brand: Shimano
• mpn: Y1rl98010
• part type: Hand Crank
• crankarm length: 170 Mm
• manufacturer warranty: 2 Years
• color: Black
• compatible bike type: Universal
• material: Aluminum
• country of origin: Japan
• upc: 689228677869

general ribicycl:

• condition: Used
• Cycling > Bicycle Components Parts > Cranksets

offer ribicycl:

• quantity: 1
• started: March 7, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True

seller ribicycl:

• rating: 99.3%
• city: Cambridge, Massachusetts
• # reviews: 623

returns ribicycl:

• policy: No Returns

shipping ribicycl:

• transit: 5-11 Days
• cost: $12.37
• class: Expedited
• service: USPS Priority Mail
• carrier: USPS
• type: Calculated

payments ribicycl:

• other
• credit card: Mastercard
• wallet: Google-pay

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