A fixed gear setup depends on three numbers working together: chainring teeth, crank arm length, and bottom bracket fit. BCD, short for bolt circle diameter, describes the spacing of the chainring bolts and decides which rings mount to the arms. You need those numbers to match the frame, chain, and riding style before ordering.
Your chainline also matters. Chainline means the alignment between the chainring and rear cog. A mismatch there causes noise, wear, and a chain that sits at an angle. The six options below cover square taper and hollow integrated designs, 44T to 49T rings, and 165mm or 170mm arms for commuting, track riding, and folding bikes.
The Picks In Brief
CYSKY Single Speed Crankset 48T 170mm Square Taper
BUCKLOS 104 BCD Mountain Bike Crankset 170MM
WEERAS Urban Folding Bicycle Crankset 44T 170mm
BOLANY SKEACE 165mm Bike Crankset 144BCD 49T
BOLANY 165mm Bike Cranksets 48T Hollow Integrated 144BCD
MAMBAS Single Speed Crankset 46T Square Taper Silver
A Closer Look At Each Pick
The CYSKY set suits a rider who already has a square taper bottom bracket and wants a straightforward 48T replacement. Forged 7075-T6 aluminum arms keep weight near 665g for the set, and the 170mm length gives familiar leverage for commuting and track use. You get both crank arms in the package, with the bottom bracket sold separately.
Unlike the smaller 44T option later in this list, this ring suits flatter routes and a higher gear ratio. The 130mm BCD and 9/16 inch pedal threads match common single speed parts. On longer rides, the 48T ring asks for stronger legs on climbs, and that trade-off defines the choice.
Points In Its Favor
- Forged 7075-T6 aluminum for a light, strong arm set
- 48T ring suits flat city routes and track riding
- 170mm arms give balanced leverage for daily pedaling
- 130mm BCD matches widely available single speed rings
- Works with standard 1/2 inch by 1/8 inch chains
Things To Consider
- Bottom bracket is not included, so check spindle length first
- Variable speed chains are not supported by this ring
The BUCKLOS crankset takes a different path from the CYSKY set, with a 104mm BCD and a hollow integrated design. Round or oval narrow-wide rings from 30T to 38T give lower gearing for mountain bike frames and electric bikes. In our view, that range suits trails and steep streets more than fast track riding.
The threaded bottom bracket fits 68mm to 73mm shells, and the listed size is 41 by 24 by 24mm. Crank weight is listed at 550g, with a separate figure near 637g for both arms in the description. Your frame shell width decides fit here, so measure before ordering.
Where It Delivers
- Narrow-wide teeth help hold chain on rough terrain
- Round or oval ring options change pedaling feel
- 30T to 38T range suits climbing and loaded riding
- Threaded bottom bracket included for 68 to 73mm shells
Points To Note
- 104mm BCD differs from 130mm and 144mm track patterns
- Lower tooth counts feel slow on flat, fast routes
- Ring size choice needs care before purchase
Who It Suits Best
Mountain bike and electric bike builders who want lower single speed gearing and a threaded bottom bracket in one package.
Where Another Pick Suits Better
CYSKY Single Speed Crankset 48T 170mm Square Taper suits track riders who want a higher 48T ring and 130mm BCD pattern.
The WEERAS set targets folding bikes and city single speeds with a 44T ring, 170mm arms, and 130mm BCD. Aluminum alloy 6061 construction and a black finish with silver teeth give a clean look for a commuter. You get a fixed right crank with ring and a separate left arm.
Compared with the 48T CYSKY option, this smaller ring eases starts and short climbs. Weight is listed near 600g per set, and chain size is 1/2 inch by 1/8 inch with 9/16 inch pedal threads. For a folding frame with limited ground clearance, the 183mm outer diameter helps keep the ring tucked in.
Positive Takeaways
- 44T ring suits folding bikes and gentle city routes
- 6061 aluminum alloy resists corrosion in daily use
- 170mm arms match familiar commuting leverage
- 130mm BCD keeps ring options open later
Trade Offs
- 44T gearing feels spinning on long flat stretches
- Bottom bracket fit still needs a separate check
The BOLANY SKEACE set shortens the arms to 165mm and switches to a 144mm BCD, a pattern common on track bikes. A 48T or 49T ring, 7075 T6 aluminum construction, and weight near 630g place it in the lighter group here. Square taper fit is listed for 113.5mm to 118mm bottom brackets.
Shorter arms can help riders with a lower saddle height or tight knee angle, and the 144mm BCD opens track ring options. Compared with the 170mm CYSKY arms, this set changes pedaling geometry in a way that suits smaller frames. Your bottom bracket spindle length decides whether the chainline lines up cleanly.
What Earns Its Place
- 165mm arms suit smaller frames and track geometry
- 144mm BCD matches classic track chainrings
- 7075 T6 aluminum keeps set weight near 630g
- 49T ring suits fast, flat track riding
- 9/16 inch pedals and 1/2 by 1/8 inch chain fit
Minor Gripes
- Square taper bottom bracket is not included
- Spindle length range needs exact frame confirmation
- 165mm arms feel short for taller riders
The BOLANY hollow integrated set shares the 165mm arms and 144mm BCD of the previous BOLANY SKEACE option, with one key difference in the box. A BB91 threaded bottom bracket and two pads are included for 68mm to 73mm shells. You avoid a separate bottom bracket purchase for a complete rebuild.
Weight is listed near 880g for the hollow integrated set, higher than the 630g square taper version. The 48T or 49T ring works with 9/16 inch pedals and 1/2 inch by 1/8 inch chain. On a busy workstand, the included bracket simplifies the job, and the trade-off is a heavier package.
Bright Spots
- BB91 threaded bottom bracket included in the set
- Hollow integrated arms for a stiff pedal feel
- 165mm length suits track and fixed gear frames
- 144mm BCD keeps track ring choices open
Room For Improvement
- 880g weight is higher than square taper alternatives
- BB91 thread size must match the frame shell
Made For
Riders rebuilding a track bike who want crank arms and a threaded bottom bracket in a single package.
Consider Something Else When
BOLANY SKEACE 165mm Bike Crankset 144BCD 49T suits builders who already own a square taper bottom bracket and want a lighter set.
The MAMBAS set brings a polished silver finish and a 46T steel chainring with forged aluminum arms. Square taper fit and 170mm arms keep it familiar for city bikes, cruisers, and fixed gear frames. The package includes chainring, both arms, and a crank bolt.
Compared with the black 48T CYSKY set, this 46T ring sits in the middle for gearing. Chain compatibility covers 1/2 inch by 1/8 inch and 1/2 inch by 3/32 inch sizes, with 9/16 inch pedal threads. Your chain width decides fit here, so check the current chain before ordering.
Strengths Worth Knowing
- Polished silver finish suits classic city builds
- 46T ring balances climbing and flat riding
- Forged aluminum arms keep weight down
- Two chain widths supported for flexibility
- 170mm arms give comfortable commuting leverage
Small Caveats
- Bottom bracket is not included in the package
- Steel ring adds weight versus full aluminum rings
What Matters Most Before Choosing a Fixed Gear Crankset
Bottom Bracket Interface
Square taper and hollow integrated designs use different bottom brackets. A square taper crank needs a matching spindle length, while a hollow integrated crank needs a threaded shell in the correct width. Your frame shell and existing bracket decide the path, so confirm both numbers first.
Chainring Size and BCD
Tooth count sets gear ratio, and BCD sets ring compatibility. A 44T ring eases climbs, a 49T ring suits fast flats, and 46T to 48T sits between those poles. BCD patterns of 104mm, 130mm, and 144mm do not interchange, so match the pattern to future ring plans.
Crank Arm Length
Crank length affects leverage and pedal position through the stroke. Riders on smaller frames often prefer 165mm arms, while 170mm arms suit taller riders and folding bikes in this list. Saddle height and knee comfort change with arm length, so test fit matters more than habit.
Chain and Pedal Fit
Single speed chains are commonly 1/2 inch by 1/8 inch, and pedal threads are commonly 9/16 inch. Narrow-wide rings for mountain bike patterns use different chain sizing. Checking chain width and pedal thread before ordering prevents returns and extra parts.
Key Considerations Across These Picks
Common Shopping Slip Ups
Ordering by tooth count alone causes many mismatches. BCD, bottom bracket type, and chain width need equal attention. A quick check of shell width, spindle length, and chain size saves a second purchase.
What The Higher Tier Buys
Higher tier sets often add a bottom bracket, use forged aluminum, or offer track BCD patterns. Those additions help builders who lack matching parts or want specific geometry. A simpler square taper set still suits riders who already own a compatible bracket.
Frequently Asked Questions
Does a crankset include a bottom bracket?
Some sets include one and some do not. The BUCKLOS and BOLANY hollow integrated sets include a threaded bottom bracket, while the CYSKY, WEERAS, BOLANY SKEACE, and MAMBAS sets list no bracket in the package.
Which BCD pattern fits a track bike?
144mm BCD is common on track bikes. The BOLANY sets use 144mm, while the CYSKY and WEERAS sets use 130mm and the BUCKLOS set uses 104mm.
What chain size works with these cranksets?
Most options here use 1/2 inch by 1/8 inch single speed chain. The MAMBAS set also lists 1/2 inch by 3/32 inch chain, and the BUCKLOS narrow-wide ring suits 7 to 12 speed chains.
Should crank arm length be 165mm or 170mm?
Frame size and saddle height guide that choice. The 165mm BOLANY sets suit smaller frames, while 170mm sets suit taller riders and folding bikes.
What pedal thread size is standard here?
Pedal threads are listed as 9/16 inch across these sets. That size fits most standard bicycle pedals for single speed builds.
Final Verdict
Match bottom bracket type, BCD, chain width, and arm length to the frame before choosing a ring size. The CYSKY 48T set suits square taper track builds, the WEERAS 44T set suits folding bikes, and the BOLANY hollow integrated set suits a complete rebuild. You will get the cleanest result from checking those four numbers first.