FSA Pro Road Triple 42T 9Sp Chainring
FSA

FSA Pro Road Triple 42T 9Sp Chainring

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Middle 42T replacement for 30/42/52 Pro Road triple cranks. CNC 7075-T6 aluminum, 130mm BCD, 5-bolt — built for smooth 9-speed front shifts.

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Product Details

Overview & Technology

FSA Pro Road Triple 42T is a purpose-built middle chainring for 30/42/52 road triple cranksets. Machined from aerospace-grade 7075-T6 aluminum, this 42-tooth ring balances low weight with long-term durability and accurate tooth profiles for consistent chain engagement. The ring is produced to the original Pro Road spec: 130mm BCD, 5-bolt pattern and finished in black anodize to resist corrosion and wear. It's optimized for Shimano 9-speed drivetrains and listed compatible with Campagnolo 10-speed systems — delivering reliable front shifting and predictable chain retention on classic triple road setups.

Key Features

Precision machining and shift aids: CNC cut tooth profiles and ramped/pinned shift geometry (where specified by FSA) speed up chain movement between rings for crisp front shifts under load. High-strength material and finish: 7075-T6 aluminum provides an excellent strength-to-weight ratio. The black anodized surface reduces wear and helps repel grime, while clear engravings make installation straightforward. • 42T middle ring for 30/42/52 triples • 130mm BCD, 5-bolt mounting • Compatible with Shimano 9-speed and Campagnolo 10-speed chains • Approx. weight: 0.2 lb (~90 g)

Fit & Compatibility

This chainring fits any crankset that uses a 130mm BCD and a 5-bolt triple configuration. It is the middle ring in a 30/42/52 triple layout and is intended for use as the intermediate cog — not as the outer ring. Compatibility notes: Designed and stamped for Shimano 9-speed chains and cross-compatible with Campagnolo 10-speed. It is not recommended for modern 11- or 12-speed chains without verifying chainline and shifting performance. Chainring bolts are not included; use appropriate 5-bolt chainring hardware matched to your crank and crankarm spacing.

Who It's For

This ring is for riders with classic triple road setups — think touring, long-distance commuting, club rides or those who prefer the wide gearing range of a 30/42/52 cassette. It's ideal for cyclists replacing a worn middle ring or refreshing an older Pro Road triple crankset. If you ride an alloy triple crank and want a lightweight, durable replacement that preserves original shifting performance, this FSA Pro Road 42T middle ring is a direct, reliable option.

Key Features

  • ✓ CNC-machined 7075-T6 aluminum for strength and low weight
  • ✓ Middle 42T for 30/42/52 triple chainsets with smooth shifts
  • ✓ 130mm BCD, 5-bolt pattern fits many Pro Road cranks
  • ✓ Black anodized finish resists corrosion and reduces wear
  • ✓ Optimized for Shimano 9-speed and compatible with Campagnolo 10
  • ✓ Approximate weight 0.2 lb (≈90 g) keeps rotating mass low
  • ✓ Direct replacement to restore crisp front shifting performance

Specifications

BCD 130
Chainring Bolts 5
Chainring Comp. 30/42/52
Teeth 42
Material 7075-T6 Aluminum
Position Middle
Primary Color Black
Speed 9

Product Identifiers

Vendor Item # 370-0242
UPC 400310004147

Frequently Asked Questions

Will this ring fit my crank?

Check that your crank uses a 130mm BCD and a 5-bolt triple configuration. This 42T ring is the middle cog in a 30/42/52 triple — if your crankset matches those specs it will fit. Verify bolt length and spacers are correct for your crank.

Is this chainring compatible with 10-speed chains?

The ring is optimized for Shimano 9-speed and listed as compatible with Campagnolo 10-speed chains. While many 10-speed chains will work, it isn't designed for modern 11- or 12-speed chains and may deliver suboptimal shifting with narrower chain widths.

Are chainring bolts included?

Chainring bolts are typically not included. Use 5-bolt chainring hardware sized for your crank and crankarm thickness. If you're replacing multiple rings, consider replacing bolts and using a thread-locker where appropriate.

Can I use this as an outer chainring?

No — this is a middle chainring specifically shaped and ramped for functioning between the inner and outer rings in a triple 30/42/52 setup. Using it as an outer ring will likely compromise shifting performance.

How difficult is installation?

Installation is straightforward for anyone comfortable working on drivetrains: remove the chain, take off the crank (or swingarm), unbolt the old ring, mount the new 42T in the middle position, torque bolts to spec, then re-fit the chain and test shifting. If unsure, have a local shop fit it.

What is the expected lifespan?

Lifespan depends on conditions and maintenance. With regular cleaning, proper chain lubrication and avoiding cross-chaining, an aluminum chainring like this typically lasts thousands of kilometers before noticeable wear — replace sooner if shift quality drops or teeth show shark-tooth wear.

Buying Guide

When buying a replacement middle chainring, prioritize BCD and bolt pattern compatibility first. Confirm your crank's BCD (here 130mm), the number of mounting bolts (5), and whether your setup is a triple 30/42/52 — this ensures the new ring sits in the correct position and the ramps/pins line up for clean front shifts. Match chainring material and speed rating to your drivetrain: 7075-T6 aluminum is a common, lightweight choice for road riders, and selecting a ring specified for 9-speed (or compatible with 10-speed Campagnolo) will give the best results. If you replace a worn ring, consider a new chain and bolts to maximize lifespan and maintain crisp shifting.

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