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Shimano · MTB crankset
A straightforward square-taper 2x crankset for budget MTB and recreational trail bikes running 7 or 8 speeds.
$54.95
PriceIn stock, ready to ship
If you’re replacing a worn or bent crank on an entry-level mountain bike, this is the kind of no-fuss option that makes sense. The 36-22T setup keeps climbing gears low enough for real off-road use, while Shimano’s SG-X and HYPERDRIVE design is built around smoother, more controlled front shifting on rough ground.
Sold by Ashburton Cycles
Verified store
Price
$54.95
Speed
2x8/7-speed
Crank arm length
175.0 mm
Chainring combination
36-22T
The Shimano FC-M315-B2 is a practical 2x square-taper MTB crankset for riders who want a dependable replacement part without overcomplicating the job. It’s designed for 2x7 and 2x8 drivetrains, uses a 36-22T chainring combo, and keeps the familiar square interface that still appears on plenty of recreational hardtails, hybrids and entry-level mountain bikes.
What matters on the trail is that it’s built around consistent front shifting rather than outright low weight. Shimano pairs the crank with SG-X chainrings and its HYPERDRIVE front-shift system, which is intended to help the chain move between rings more cleanly when the bike is bouncing around or you’re shifting under light load. For riders replacing an original equipment crank on a budget MTB, that means a product aimed at getting back to smooth, predictable function instead of chasing upgrades you may not need.
Before you buy, the main thing to check is fit. This B2 version uses a 51.8 mm chainline, works with a square-taper threaded bottom bracket, and is listed for 68 mm or 73 mm bottom bracket shells with an LL123 axle length. It’s also the outboard 141 mm QR / 148 mm version, so it isn’t the same fit as the standard FC-M315-2. Match those details carefully and this is a sensible replacement for many modern budget MTB frames using 7- or 8-speed double setups.
Ideal for riders repairing or refreshing a budget mountain bike or recreational trail bike that already uses a square-taper 2x7 or 2x8 drivetrain.
2x7 and 2x8 drivetrain fit
Suited to common entry-level mountain bike setups, making it a practical replacement crank rather than an unnecessary full drivetrain swap.
36-22T gearing
Gives you a usable top gear for bike paths and fire roads, with a small inner ring that still helps on steeper climbs.
Square-taper interface
A familiar standard on many affordable MTBs, so it can be a straightforward replacement when you match the bottom bracket correctly.
SG-X chainrings
Chainring shaping is designed to help the chain move between rings more cleanly for steadier front shifting.
HYPERDRIVE front-shift design
Built as part of Shimano’s matched front-shift system to improve control and consistency when the trail gets rough.
51.8 mm chainline
This B2 version is made for specific frame and rear-end layouts, so it suits bikes that need the more outboard setup.
68 mm and 73 mm BB shell compatibility
Covers the threaded shell widths commonly found on older and budget mountain bikes.
No chain guard
A cleaner MTB-focused setup for riders who want a simple off-road crank without extra guard hardware.
Shimano tourney FC TY501 crankset installation #shorts
CB Garage
Every detail as listed by the manufacturer.
Shimano is a Japanese component brand founded in 1921 in Sakai, Osaka. The company began with bicycle component manufacturing and has grown into a global business focused on bicycle components, fishing tackle and rowing equipment, while keeping its headquarters in Sakai. In cycling, Shimano is best known for building complete component ecosystems that span road, mountain, gravel, commuting and e-bike use. Its range covers drivetrains, brakes, wheels, pedals, shoes and related parts, and the brand has had a long presence in Australia through a local business established in Sydney in 1992.
Shimano · MTB crankset
A straightforward square-taper 2x crankset for budget MTB and recreational trail bikes running 7 or 8 speeds.
$54.95
In stockSpeed
2x8/7-speed
Crank arm length
175.0 mm
Chainring combination
36-22T
Chainline
51.8 mm
If you’re replacing a worn or bent crank on an entry-level mountain bike, this is the kind of no-fuss option that makes sense. The 36-22T setup keeps climbing gears low enough for real off-road use, while Shimano’s SG-X and HYPERDRIVE design is built around smoother, more controlled front shifting on rough ground.
The Shimano FC-M315-B2 is a practical 2x square-taper MTB crankset for riders who want a dependable replacement part without overcomplicating the job. It’s designed for 2x7 and 2x8 drivetrains, uses a 36-22T chainring combo, and keeps the familiar square interface that still appears on plenty of recreational hardtails, hybrids and entry-level mountain bikes.
What matters on the trail is that it’s built around consistent front shifting rather than outright low weight. Shimano pairs the crank with SG-X chainrings and its HYPERDRIVE front-shift system, which is intended to help the chain move between rings more cleanly when the bike is bouncing around or you’re shifting under light load. For riders replacing an original equipment crank on a budget MTB, that means a product aimed at getting back to smooth, predictable function instead of chasing upgrades you may not need.
Before you buy, the main thing to check is fit. This B2 version uses a 51.8 mm chainline, works with a square-taper threaded bottom bracket, and is listed for 68 mm or 73 mm bottom bracket shells with an LL123 axle length. It’s also the outboard 141 mm QR / 148 mm version, so it isn’t the same fit as the standard FC-M315-2. Match those details carefully and this is a sensible replacement for many modern budget MTB frames using 7- or 8-speed double setups.
Ideal for riders repairing or refreshing a budget mountain bike or recreational trail bike that already uses a square-taper 2x7 or 2x8 drivetrain.
2x7 and 2x8 drivetrain fit
Suited to common entry-level mountain bike setups, making it a practical replacement crank rather than an unnecessary full drivetrain swap.
36-22T gearing
Gives you a usable top gear for bike paths and fire roads, with a small inner ring that still helps on steeper climbs.
Square-taper interface
A familiar standard on many affordable MTBs, so it can be a straightforward replacement when you match the bottom bracket correctly.
SG-X chainrings
Chainring shaping is designed to help the chain move between rings more cleanly for steadier front shifting.
HYPERDRIVE front-shift design
Built as part of Shimano’s matched front-shift system to improve control and consistency when the trail gets rough.
51.8 mm chainline
This B2 version is made for specific frame and rear-end layouts, so it suits bikes that need the more outboard setup.
68 mm and 73 mm BB shell compatibility
Covers the threaded shell widths commonly found on older and budget mountain bikes.
No chain guard
A cleaner MTB-focused setup for riders who want a simple off-road crank without extra guard hardware.
Shimano tourney FC TY501 crankset installation #shorts
CB Garage