SRAM

SRAM Eagle S100 B1

Name: SRAM Eagle S100 B1
Brand: SRAM
SKU: 350954
Rating: 3.8 (1 reviews)

In Stock

Robust, no-nonsense SRAM Eagle S100 crankset built from forged aluminum with a steel X-Sync 2 32T ring. Powerspline interface and multiple arm lengths for a precise MTB fit.

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Available Options

Option	Price	Availability
SRAM, Eagle S100 B1, Crankset, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, 32, Powerspline, 155mm, Black, MTB	—	In Stock
SRAM, Eagle S100 B1, Crankset, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, 32, Powerspline, 160mm, Black, MTB	—	In Stock
SRAM, Eagle S100 B1, Crankset, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, 32, Powerspline, 165mm, Black, MTB	—	In Stock
SRAM, Eagle S100 B1, Crankset, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, 32, Powerspline, 170mm, Black, MTB	—	In Stock
SRAM, Eagle S100 B1, Crankset, Speed: 12, BCD: Direct Mount SRAM 3 Bolt, 32, Powerspline, 175mm, Black, MTB	—	In Stock

Product Details

Overview & Technology

The SRAM Eagle S100 B1 (Model ID: FC-S100-B1, MPN 00.6118.772.000) is a purpose-built aluminium crankset designed for 12-speed MTB drivetrains. It combines a stout forged aluminum arm construction with a hardened steel X-Sync 2 direct-mount 32T chainring to deliver dependable strength, consistent chain retention and long service life on trail. Key technologies include SRAM's Powerspline interface for a secure, torque-resistant attachment to compatible bottom brackets (use 118/73 Powerspline BBs) and a Direct Mount SRAM 3-Bolt chainring fitment that makes ring swaps fast and simple. With a 49mm chainline and 9/16" pedal threads, the Eagle S100 is tuned to integrate with modern Eagle drivetrains and boost the reliability of daily riding and aggressive trail use.

Key Features & Benefits

Forged aluminum crank arms balance low weight with high stiffness — you get a responsive pedaling platform that resists flex under load. The arms are finished in hard-wearing black and optimized for trail impacts and repeated abuse without excessive weight penalty. Steel X-Sync 2 32T chainring provides industry-leading chain retention and wear resistance compared with softer alloy rings, translating to fewer dropped chains and longer intervals between replacements. The Powerspline interface and direct-mount 3-bolt BCD simplify installation and maintain precise alignment for smooth shifting and efficient power transfer.

Fit, Compatibility & Installation

The Eagle S100 uses the Powerspline interface and requires a 118/73 Powerspline bottom bracket (sold separately); it is not supplied with a BB. Chainline is 49mm and the crank is specified for 12-speed Eagle drivetrains, so it pairs seamlessly with SRAM 12-speed cassettes and chains. Pedal threads are standard 9/16". Available arm lengths span 155mm, 160mm, 165mm, 170mm and 175mm, letting riders choose progressively shorter or longer cranks to dial in fit, leverage and pedaling style. The direct-mount 3-bolt chainring makes future upgrades or replacement rings straightforward — just ensure replacement rings match SRAM's X-Sync 2 tooth profile for optimal retention.

Who's This For?

The Eagle S100 B1 is aimed at riders who want a reliable, straightforward crankset for trail, cross-country and general mountain biking without the premium price of carbon or hollow-forged high-end cranks. It's ideal for riders prioritizing durability and low maintenance — bike park shred, daily trail riders, club racers on mixed terrain and riders upgrading older cranks for better chain retention. If you want a lightweight race-specific crank or one-piece high-modulus carbon styling, look higher in SRAM's range; if you want a practical, long-wearing crankset that integrates cleanly with Eagle 12-speed drivetrains, the S100 delivers consistent performance and value.

Key Features

✓ Forged aluminum crank arms for a strong, responsive pedaling platform
✓ Steel X-Sync 2 32T chainring for exceptional durability and chain retention
✓ Powerspline interface ensures secure, slip-free crank attachment
✓ 49mm chainline tuned for modern 12-speed Eagle MTB drivetrains
✓ Available 155–175mm arm lengths to precisely dial rider fit
✓ Direct-mount SRAM 3-bolt BCD simplifies ring swaps and upgrades
✓ Standard 9/16" pedal threads for universal pedal compatibility

Specifications

BCD	Direct Mount SRAM 3 Bolt
BB Inclusion	No
Chainline	49mm
Teeth	32
Crank Arm Length	155mm
Interface	Powerspline
Crankset Material	Aluminum
Pedals Thread	9/16''
Primary Color	Black
Speed	12
Drivetrain Spacing	MTB

Product Identifiers

Vendor Item #	00.6118.772.000
UPC	710845928222

Frequently Asked Questions

What bottom bracket do I need for the Eagle S100 B1?

The S100 uses SRAM's Powerspline interface and requires a 118/73 Powerspline bottom bracket (sold separately). It will not work with non-Powerspline BB standards without an adapter.

Is the steel chainring replaceable and what rings fit?

Yes — the S100 uses a Direct Mount SRAM 3-bolt BCD with an X-Sync 2 steel 32T ring. Replace with SRAM X-Sync 2 direct-mount rings to maintain tooth profile and optimal chain retention.

Can I use the S100 with non-SRAM drivetrains?

The crank will physically spin with non-SRAM drivetrains, but it's optimized for SRAM Eagle 12-speed chains and cassettes. For best shifting and chain retention, pair it with SRAM 12-speed Eagle components.

What crank arm lengths are available?

SRAM offers the S100 in 155mm, 160mm, 165mm, 170mm and 175mm lengths, allowing riders to choose the most comfortable and efficient leverage for their riding style.

How durable is the crankset for aggressive trail use?

The S100's forged aluminum arms and hardened steel X-Sync 2 ring are built for durability and regular trail abuse. While not a premium race carbon crank, it delivers excellent longevity and resistance to impact and wear for most trail and enduro-adjacent riding.

Does the crankset include pedals or a bottom bracket?

No — the crankset ships without pedals and does not include a bottom bracket. Pedals must be purchased separately (9/16" standard threads) and you should buy a compatible 118/73 Powerspline BB.

Buying Guide

When choosing a mountain crankset, prioritize interface compatibility (Powerspline for the S100), crank arm length and chainring tooth count. The S100's 32T steel ring is a versatile trail option that balances climbing gears and top-end speed; choose arm lengths based on rider height, pedaling style and pedal-clearance needs. Also consider materials and maintenance: aluminum arms offer an excellent strength-to-weight ratio and affordable serviceability, while steel chainrings maximize wear life and retention. Finally, confirm bottom bracket standard and pedal thread size (9/16") so you have all components ready for a trouble-free install.

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