Best Single Speed Crankset With Bottom Bracket for Mountain Bikes
If you’re upgrading a single-speed or fixing up a track-style ride, a reliable single-speed crankset with a bottom bracket is essential. This guide highlights five solid options, explaining who each product is best for and why it stands out. Whether you ride rugged trails, urban commutes, or fixed-gear routes, the selections below help you balance strength, weight, and compatibility. The buyer will typically be a casual rider upgrading components, a commuter seeking durability, or a rider experimenting with single-speed setups.
| Product | Main Benefit | Best For |
|---|---|---|
| BUCKLOS 104 BCD 30T-38T | Wide range, CNC aluminum, lightweight | Versatile gearing for road and trail |
| PETCHOR Square Taper 34T | Removable chainring, strong bottom bracket seal | Customizable singles with solid protection |
| CYSKY Single Speed 48T | Fixed gear compatibility, compact for tight rides | Fixed-gear or track-style use |
| PETCHOR 36T Square Taper | Three-ring option, upgraded seal | Flexible single/double/triple setups |
| BOLANY Hollow Integrated 34T | Integrated design, durable 7075 alloy | Reliable all-round MTB singles |
BUCKLOS 104 BCD 30T-38T Mountain Bike Crankset
The BUCKLOS crankset features a 104 BCD mountain bike crank with options for 30T, 32T, 34T, 36T, and 38T chainrings in round or oval shapes. A 170mm crank arm length and a 74mm crank-related hole distance support compatibility with common 7-12 speed chains. The assembly uses CNC aluminum alloy for a balance of lightness and axial strength, keeping weight around 550g for the crank and chainring. This setup is best for riders who want a lightweight, adaptable single-speed option that can handle a mix of trails and city roads.
- Best for: riders needing a versatile, lightweight single-speed option that supports multiple chainring sizes.
- Why selected: Strong aluminum construction with a narrow/wide tooth option helps with chain retention on varied terrains.
- Limitations: Compatibility notes suggest matching chainline and chain size to avoid rubbing on certain frames.
PETCHOR Square Taper Crankset 34T with 104BCD
The PETCHOR square-taper crankset uses a 104BCD pattern and 170mm crank arms, featuring a 34T chainring. It includes a frosted, anodized surface for better durability and corrosion resistance, plus a square taper bottom bracket designed for improved sealing and lubrication. The design supports single, dual, or triple gear configurations, with a removable chainring for easier customization. Chainline is around 45mm, and the setup is compatible with typical 1/2″ x 1/8″ chains. This option suits riders who want a robust, adjustable single-speed upgrade with enhanced protection against wear.
- Best for: riders seeking a durable, adjustable crankset with easy ring removal and solid bottom bracket protection.
- Why selected: Upgrade-ready, good chain retention with narrow/wide teeth, and multiple crankset options.
- Limitations: May require precise matching of bottom bracket axle length to frame for optimal alignment.
PETCHOR 36T Square Taper MTB Crankset
This PETCHOR 36T square-taper crankset is designed for 170mm crank arms and uses a 104BCD pattern with a 38T chainring commonly used in single-speed builds. The frosted anodized finish protects the aluminum body, and the removable chainring design supports easy adjustments to single-, dual-, or triple-ring configurations. A square-taper bottom bracket aids sealing and lubrication, providing a more durable setup relative to basic bottom brackets. It emphasizes a lighter feel while preserving a strong power transfer for trail and urban rides alike.
- Best for: riders who want a sturdy, upgrade-friendly crankset with solid chain retention and protection.
- Why selected: Three-ring compatibility and improved bottom bracket protection for longevity.
- Limitations: Some frames may require precise spindle length selection for optimal chain alignment.
BOLANY 170mm Hollow Integrated 34T MTB Crankset
The BOLANY crankset features a hollow integrated design with 170mm crank arms, 104Bcd, and a 34T single-speed chainring. It includes a BB91 threaded bottom bracket and crank dust cap for protection. The set weighs about 900g and uses a sturdy 7075 T6 aluminum alloy for durability and precise tooth shapes. The chains and chainline are designed to work with 68-73mm bottom brackets. This option is best for riders seeking a complete, ready-to-install single-speed solution with reliable bottom bracket integration and robust construction.
- Best for: riders needing a complete integrated solution with a ready-to-install bottom bracket assembly.
- Why selected: Heavy-duty construction and integrated design reduce setup complexity and potential misalignment.
- Limitations: Heavier than some lighter race-focused cranksets, which may affect overall weight-sensitive builds.
Buying Guide: Single Speed Cranksets With Bottom Brackets
Key considerations help you pick the right crankset for a single-speed bike. First, determine your frame compatibility, especially bottom bracket shell width and spindle length. Next, decide on chainring size: common ranges are around 34-38T for urban riding and around 30-38T for trails; consider narrow/wide teeth for chain retention. Material matters: aluminum alloys balance weight and strength, while hollow or integrated designs can improve stiffness. Finally, consider maintenance: removable chainrings simplify replacements and upgrades, while sealed bottom brackets reduce lubrication needs in wet conditions.
- Is the crankset compatible with your bottom bracket type (square taper vs. Hollow/Integrated)? What chainline is standard for your frame?
- Best overall choice: For a balance of weight, durability, and ease of upgrade, a 170mm crank with 104BCD is versatile.
- For rugged trails: Look for chainring options 34T-38T with sturdy aluminum construction and good chain retention.
- For urban commuting: Prioritize durability and maintenance ease; sealed bottom brackets and removable rings help with serviceability.
Frequently Asked Questions
- What is the advantage of a 104 BCD crankset? It supports a range of chainrings and simplifies upgrades while maintaining compatibility with common single-speed setups.
- Do I need a specific bottom bracket for square-taper cranks? Yes. Square-taper cranks require a compatible square-taper bottom bracket; check spacing and axle length for your frame.
- Can I use a multi-chainring setup on a single-speed bike? Yes, if the crankset is designed for removable chainrings and compatible with your bottom bracket and frame spacing.
- Is heavier better for single-speed cranksets? Weight is a trade-off. Heavier parts often indicate robust construction, but lighter options improve acceleration and climbing feel.
- Will these cranksets fit my 68mm shell? Most listed options target common MTB shells; confirm shell width and axle compatibility with your frame before purchase.
- What maintenance is needed? Regular lubrication of the bottom bracket interface and periodic inspection of chainring wear are recommended for longevity.