RockShox Maxle Ultimate Rear
Maxle Ultimate Rear
Maxle Ultimate Rear
Maxle Ultimate Rear
RockShox

RockShox Maxle Ultimate Rear

In Stock

OEM replacement RockShox Maxle Ultimate rear thru-axle — CNC aluminum body with a non-tooled lever for fast, secure wheel changes on Boost 12x148mm hubs.

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Available Options

Option Price Availability
RockShox, MAXLE ULTIMATE, Thru Axle, Rear, 12x148mm TA, Length: 188mm, Thread Length: 20mm, Thread Pitch: M12x1.75, Boost — In Stock
RockShox, MAXLE ULTIMATE, Thru Axle, Rear, 12x148mm TA, Length: 180mm, Thread Length: 20mm, Thread Pitch: M12x1.75, Boost — Out of Stock
RockShox, MAXLE ULTIMATE, Thru Axle, Rear, 12x150mm TA, Length: 182mm, Thread Length: 20mm, Thread Pitch: M12x1.75, Standard — Out of Stock
RockShox, MAXLE ULTIMATE, Thru Axle, Rear, 12x197mm TA, Length: 229mm, Thread Length: 20mm, Thread Pitch: M12x1.50, Fat Bike Custom — Out of Stock

Product Details

Overview & Technology

RockShox Maxle Ultimate Rear (PN 00.4318.005.010, SRAM ID AX-ULT-MXLR-A1) is a direct-replacement rear thru-axle engineered for modern mountain bikes. It uses a precision-machined aluminum shaft and a non-tooled cam lever mechanism to deliver a balance of stiffness, low weight and reliable retention for 12x148mm Boost rear hubs. The axle features an M12x1.75 thread, 20mm thread engagement and a 180mm skewer length in the Boost 12x148mm variant. The non-tooled lever provides fast, tool-free wheel removal while the robust aluminum construction resists flex under heavy loads — giving predictable wheel alignment and confident handling on rough trails.

Key Features

Built for performance and simplicity. The Maxle Ultimate Rear is CNC-machined from aluminum for consistent dimensions and an excellent stiffness-to-weight ratio. The cam-based, non-tooled lever closes securely with a positive engagement to prevent loosening under vibration. • Material: Aluminum construction for durability and reduced weight. • Thread spec: M12 x 1.75 with 20mm thread length for secure engagement. • Axle spacing: 12x148mm Boost (other variants available for Standard and Fat frames). • Lever: Tool-free quick-release style cam lever for fast wheel swaps.

Fit & Compatibility

The listed SKU fits rear Boost spacing (12x148mm) hubs and frames that accept an M12x1.75 rear thru-axle with 20mm of thread engagement. Available variants cover common rear standards: 12x148mm Boost, 12x150mm Standard, longer 12x197mm Fat configurations, and select 12x148mm Boost lengths for different frame/hub offsets. Before ordering, confirm your bike's rear axle spacing, thread pitch and required overall length. Using the wrong thread pitch or insufficient thread engagement can damage hub endcaps or frame threads — the Maxle Ultimate is intended as a direct replacement where specifications match.

Who It's For

This is aimed at mountain riders, mechanics and shops who need a reliable OEM-quality replacement or spares axle for RockShox-compatible rear hubs and frames. It's a great choice if you value quick wheel changes and a proven cam-lever retention system without adding unnecessary weight. Gravel or road users with compatible spacing won't typically need this axle — it's optimized for modern trail and enduro-style mountain bikes that use Boost spacing and want a strong, low-weight rear thru-axle solution.

Key Features

  • ✓ Direct-replacement RockShox Maxle Ultimate rear thru-axle, OEM spec
  • ✓ CNC-machined aluminum construction for strength and low weight
  • ✓ Non-tooled cam lever for fast, positive wheel removal and install
  • ✓ Thread: M12 x 1.75 with 20mm of thread engagement
  • ✓ Specifically available for Boost 12x148mm rear spacing variants
  • ✓ Multiple length/thread variants cover standard and fat-bike needs
  • ✓ Compact 180mm skewer length (Boost 12x148mm variant)
  • ✓ Lightweight shipping weight: 0.2 lb, small footprint for spares

Specifications

Hub Axle Thread M12x1.75
Position Rear
Primary Color Black
Skewer Length 180mm
Axle/Hub spacing 12x148mm TA
Thread Length 20mm
Thru Axle Compatibility Boost
Lever Mechanism Non-tooled
Material Aluminum

Product Identifiers

Vendor Item # 00.4318.005.012
UPC 710845768149

Frequently Asked Questions

Is this Maxle compatible with my 12x148mm Boost rear hub?

Yes — the Boost 12x148mm variant of the Maxle Ultimate Rear uses an M12x1.75 thread and 20mm thread engagement designed for Boost rear hubs. Confirm your frame/hub accepts an M12x1.75 rear axle before purchase.

Can I replace just the lever or parts of the Maxle Ultimate?

Some RockShox replacement parts support swapping lever assemblies or small internals, but availability depends on the exact model and production run. Check RockShox parts lists or contact Forest Bikes support with the part number (00.4318.005.010) for spares availability.

What happens if I use the wrong thread pitch or axle length?

Using the incorrect thread pitch or insufficient/incorrect axle length can cross-thread hub or frame threads, leading to damage. Always match thread pitch (M12x1.75 or M12x1.50 for fat variants), axle length, and spacing to your hub/frame specifications.

How do I maintain the Maxle Ultimate rear axle?

Regularly clean the axle and interface surfaces, inspect the threads for damage, and apply a thin film of anti-seize or light grease to the threads to prevent corrosion. Periodically check lever engagement and re-tension as needed following manufacturer guidance.

Can I use this axle with non-RockShox hubs?

Yes, provided the hub and frame match the axle's thread pitch, length and spacing. The Maxle Ultimate is a thru-axle standard part — compatibility is determined by dimensions, not brand — but always verify fit before install.

Which variant should I choose for a fat-bike rear hub?

Choose the 12x197mm TA variant with M12x1.50 thread pitch listed as the Fat Bike Custom option. Fat-bike setups require longer overall axle length and a different thread pitch in some cases, so confirm your hub spec first.

Buying Guide

When buying a replacement rear thru-axle, first measure your bike's rear axle spacing (commonly 12x148mm Boost for modern mountain bikes), the thread pitch on your hub endcaps (M12x1.75 or M12x1.50 for some fat-bike setups), and the overall length required by your frame. Match these three dimensions exactly — spacing, thread pitch and length — to avoid fit issues or damage. Decide whether you prefer a tool-free lever (fast wheel changes) or a toolless bolt style and consider material choices: aluminum axles like the Maxle Ultimate are lightweight and stiff, while steel options can be heavier but more impact-resistant. Finally, check manufacturer part numbers (this SKU is 00.4318.005.010, SRAM ID AX-ULT-MXLR-A1) for a direct OEM replacement.

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