SRAM Red AXS E1 Pulley Kit
SRAM

SRAM Red AXS E1 Pulley Kit

$175.00
In Stock

SRAM Red AXS E1 Pulley Kit replaces stock pulleys with a ceramic 12T upper and 14T lower on a metal spider, plus titanium bolts and grease for lower friction and improved durability.

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Product Details

Overview & Technology

SRAM Red AXS E1 Pulley Kit (MPN 11.7518.109.002, SRAM ID RD-SPP-A0) is a direct-replacement pulley set engineered for the Red E1 rear derailleur. The kit pairs a ceramic 12-tooth upper pulley with a 14-tooth lower pulley mounted on a precision-machined metal spider to combine the low friction of ceramic bearings with the strength and stability of a metal carrier. The pulleys use high-grade ceramic ball bearings and come with two titanium pulley screws (18.5mm and 12.8mm) plus a small tube of grease for installation and long-term performance. That mix of materials reduces rotational drag, resists wear, and keeps shifting crisp under extended road use.

Key Features & Benefits

Ceramic bearings lower friction compared to steel, which can translate to a smoother drivetrain and micro-watt savings during long efforts. The 12T upper and 14T lower tooth counts maintain chain wrap and shift indexing exactly as SRAM intended for Red E1 setups. Titanium mounting hardware keeps weight down while offering excellent corrosion resistance; the included grease ensures bearings are lubricated for quiet operation right out of the box. The metal spider carrier adds stiffness and helps keep the lower pulley stable under load for consistent chain control.

Fit, Materials & Compatibility

This kit is designed specifically for SRAM Red E1 rear derailleurs and is not a universal pulley set. The package includes the 12T upper ceramic pulley, 14T lower pulley mounted to a metal spider, 18.5mm and 12.8mm titanium pulley bolts, and grease — matching the dimensions and mounting geometry required by Red E1 cages. Construction details: ceramic ball bearings, metal (aluminium/steel alloy) spider carrier, titanium bolts, and factory grease. Shipping weight is approximately 0.2 lb and the parcel dimensions are 8.125" x 5.5" x 1.375". Always follow SRAM torque and installation guidance when fitting the kit to your derailleur.

Who This Is For

The Red AXS E1 Pulley Kit is aimed at road cyclists who run SRAM Red E1 drivetrains and want a performance-oriented upgrade: racers, time-trialists, and enthusiasts chasing lower friction and longer-lasting pulleys. It’s ideal for riders who want crisp, quiet shifting and slightly reduced drivetrain drag without altering pulley geometry. If you have a different SRAM derailleur model (Force, Rival, or older eTap versions), check compatibility first — this kit is made for the Red E1 cage and is not guaranteed to fit other models. Mechanics and home wrenchers who value premium hardware and straightforward swaps will also appreciate the included bolts and grease for a tidy installation.

Key Features

  • ✓ Ceramic 12T upper pulley for low-friction chain engagement
  • ✓ 14T lower pulley mounted on a precision metal spider for stability
  • ✓ Includes 18.5mm and 12.8mm titanium pulley bolts for weight and corrosion resistance
  • ✓ Factory-supplied grease included for immediate, quiet operation
  • ✓ Direct-fit compatibility with SRAM Red E1 rear derailleurs only
  • ✓ Lightweight kit — total shipping weight ~0.2 lb, compact packaging
  • ✓ SRAM model ID RD-SPP-A0, MPN 11.7518.109.002 for easy identification

Specifications

Pulley Compatibility Red E1

Product Identifiers

Vendor Item # 11.7518.109.002
UPC 710845911415

Frequently Asked Questions

Will this pulley kit fit my SRAM Red AXS derailleur?

Yes — this kit is designed specifically for the SRAM Red E1 rear derailleur. It matches the cage geometry and mounting interfaces of Red E1; it is not a universal fit for other SRAM derailleur families like Force or Rival.

What are the benefits of ceramic bearings in pulleys?

Ceramic bearings reduce rotational friction compared with conventional steel bearings, which can yield smoother, quieter operation and marginal drivetrain efficiency gains. They also tend to be more wear-resistant and corrosion-tolerant when properly maintained.

Can I reuse my original bolts or should I use the supplied titanium screws?

Use the supplied titanium bolts sized 18.5mm and 12.8mm for proper fit and torque characteristics. Titanium hardware is lighter and more corrosion-resistant; mixing bolt types or lengths can affect pulley alignment and performance.

How do I maintain these pulleys?

Keep the bearings lightly greased (use the included grease for initial installation) and inspect pulleys periodically for lateral play or tooth wear. Clean grit and grime away with a brush and mild degreaser, then re-lubricate. Replace pulleys when bearings develop play or teeth become excessively worn.

Is installation difficult — do I need special tools?

Installation is straightforward for anyone comfortable with derailleur maintenance: remove the cage, swap pulleys and bolts, then reinstall following SRAM’s torque guidelines. Standard hex or Torx tools used for derailleur maintenance are typically sufficient; consult SRAM documentation or a mechanic if unsure.

Will these pulleys change my gear ratios or shifting feel?

No — the 12T/14T configuration preserves the intended chainwrap and indexing for Red E1 derailleurs. You should notice crisper, quieter shifts and less rotational drag, but gear range and ratios remain unchanged.

Buying Guide

When shopping for derailleur pulley kits, prioritize compatibility, bearing type, and hardware quality. Ceramic bearings offer lower friction and longer life but require correct sealing and routine maintenance; ensure the kit matches your derailleur family and cage geometry. Titanium bolts save grams and resist corrosion, but the primary goal should be correct fit and reliable performance. Consider whether you want a full-metal spider assembly (better stiffness) or individual pulleys (easier replacement). Factor in real-world benefits: quieter operation, marginal efficiency gains, and longer service intervals versus cost. If you ride a SRAM Red E1 setup and value premium performance, this kit is a direct, high-quality upgrade.

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