The Best 104 Bcd Crank Arms of 2025 – Reviewed and Top Rated
After hours researching and comparing all models on the market, we find out the Best 104 Bcd Crank Arms of 2025. Check our ranking below.
2,343 Reviews Scanned
- Suitable for: 42T bike crankset, 170mm arm, suits for single speed bicycle and 6/7/8/9/10/11 Speeds MTB Bike, floding bike
- Drop Stop Design:Narrow wide chainning could prevents chain drop from the chainring, it is the most advanced tooth profile on the Market, making your cycling safer
- Material: The material is aluminum alloy, which is sturdy, non rusting, the net weight is only 0.6kg（1.32lb)
- 104 BCD Chainring： Convenient for future disc replacement, giving you more options
- 【High quality】One-piece die-casting, this bicycle crank arm is made of forged alloy 6061, strong and durable, high strength, hardness, not easy to deformation.
- 【Feature】Crank Color:black,Crank Arm Length:152MM/160MM/170MM/175MM,BCD 104MM,fit for: pedal diameter = 9/16.
- 【Spindle Interface Type】Square taper. Please check if the orientation of your right crank is Square. Keep both left and right things having the same hole.
- 【Installation Tips】This crank arm is divided into left and right side, please pay attention to the left and right side when installing, the crank arm is written L and R, L is installed on the left side, R is installed on the right side. L is installed on the left side, R is installed on the right side. If you install it wrong, it will not work.
- 【Package List】:2xCrank Arms,4pc chainring screws,2xcrank arm bolts.
- 【Ultra-light Material】：Made of high strength Aluminum Alloy, Non-slip &Durable,Weight is approx 675g/1.48Ib.
- 【Professional Design】Ergonomic structure,Super lightweight and incredibly strong.Best choice for riders who want more control on their bicycles.
- 【Size】BCD: 104mm/4.09in. Crank Arm length: 170mm/6.69in, Crank related holes distance: 74mm/2.91in.Bottom Bracket Width: 68-73mm/2.67-2.87in.
- 【Easy Installation and compatibility.】 Compatible with most mountain bikes and dirt bicycles.Including not confined to Shimano, FSA, Gaint ATX770 ATX770-D XTC 750.
- 【Package Include】 One Fordged Crank Set, Bottom Bracket, 4 pcs Single Chainring Bolts, Crank screw, Crankset bolt Allen Wrench.
- 【High quality】One-piece die-casting, this bicycle crank arm is made of forged alloy 6061, strong and durable, high strength, hardness, not easy to deformation.
- 【Feature】Crank Color:black,Crank Arm Length:152MM/160MM/165mm/170MM/175MM,BCD104MM,fit for: pedal diameter = 9/16,Weight: approximately 640g.
- 【Spindle Interface Type】Square taper. Please check if the orientation of your right crank is Square. Keep both left and right things having the same hole.
- 【Installation Tips】This crank arm is divided into left and right side, please pay attention to the left and right side when installing, the crank arm is written L and R, L is installed on the left side, R is installed on the right side. L is installed on the left side, R is installed on the right side. If you install it wrong, it will not work.
- 【Package List】:2xCrank Arms,Crank screws.
- 【Premium Quality】:This bike crank arms is made of premium quality Forged Alloy 6061 T6 material, which is sturdy and durable in use. Crank Finish is SAND BLACK,It is not easily damaged and deformed, has reliable quality and ensures high strength for long lasting usage.
- 【Feature】Crank arm length is 170MM/175MM,BCD is 104mm.B.B.TAPER SQUARE is 156.5MM,B.B.STANDARD is 100MM,Q-FACTOR is 219.5MM,I-FACTOR is 189.5MM.
- 【Spindle Interface Type】Square Hole. Please check if the orientation of your right crank is Square. Keep both left and right things having the same hole.
- 【Easy to install】:The crank arm is lightweight, easy to install and use.
- 【Package List】:2xCrank Arms,4pc chainring screws,2xcrank arm bolts.
- Suitable for:42T bike crankset, 170mm arm, suits for single speed bicycle and 6/7/8/9/10/11 speeds MTB Bike, folding bicycle
- Material: The material is aluminum alloy, which is sturdy, non rusting, the net weight is only 0.75kg（1.65lb)
- Drop Stop Design:Narrow wide chainning could prevents chain drop from the chainring, it is the most advanced tooth profile on the Market, making your cycling safer
- 104 BCD Chainring： Convenient for future disc replacement, giving you more options
- 【Crank parameter】Length: 170mm (6.69in), BCD: 104mm, Weight: 566.2g(1.248lb), Crankset Hole: Square hole
- 【Features】Lightweight, CNC machining, surface oxidation treatment, anti-corrosion and wear-resistant, not easy to break
- 【Premium Quality】The single chainring bike crank set is made high strength aluminium alloy material, not easy to deform, durable for long-term use
- 【Strong compatibility】Compatible with 30~44 teeth single chainring
- 【Wild applications】A good replacement for bike repair, compatible with many bike models. Suitable for most mountain bikes, road bikes, city bikes etc
- Crank Set: 104BCD Mountain bike crankset, made from ultralight aluminum alloy, very solid. Square taper crankset is frosted and anodized, which effectively protects the aluminum alloy body and prolongs the use time. Crank arm length: 170mm.
- 104BCD Chainring: The alternate design of narrow and wide teeth can effectively prevent the chain from falling off. 32T/34T/36T/38T/40T/42T round black chainring are available in a variety of options to meet various needs.
- Compatible: Suitable for most of 8/9/10/11 single speed MTB mountain bike, road bicycle, electric bike, folding bike, not for multi-speed bikes.
- Easy to Install: This is a square taper crankset that is simple and reliable. If you have any problem before or after purchase, feel free to contact us.
- Package Content: 1x 170mm left crankset, 1 x 170mm right crankset and 1x chainring, 4 x bolts. The crank and chainring are only fit single speed, cannot be used with other speed.
- [Material]: Alloy 6061 moutain bike Square crank , Light weight, Stylish, High compatibility,Durable,7075 Narrow Wide Chainring 38T
- [Crank Arm ]: 170mm MTB Crank for Montain Bike,Removable 104 BCD Chain ring Design,Easy to modify bigger teeth Single speed MTB Crankset.
- [Chain ring]Size: 38 T,Shape:Round. Single Speed Chainring Weight: Approx 71.5g(0.15 lbs) ,Fit for 9 Speed,10 Speed,11 Speed Mountain Bike crank set. 4mm Narrow Wide tooth design ensures ultimate chain retention,increases wear life,and reduces friction and noise.
- [Feature]: Square Taper Crankset,Pedal size : 9/16" , BB not included, Fit For Mountain Bike, Road Bike Crank Set etc.,
- [Package Includes]: 1 x 170mm square Taper crank;1 x 104BCD 38 Teeth Chainring;4 x Chainring bolts(set)
- Crank : 104 BCD mountain bike crankset. length of crank arm is170mm, crank related holes distance is 74mm, crank weight: 550g, fit 7-12S chains and single/double/triple speed chainring
- Chainring : snail single speed narrow wide teeth chainring, 30T/32T/34/36/38T/40/42T, round/oval chainring,thickness is 4mm (1.9mm narrow, 3.7mm wide)
- Bottom Bracket : Size is 41*24*24 mm can fit bike bottom 68-73mm,ideal for Shimano, FSA compatible. Giant ATX770 ATX770-D XTC750 and so on
- Material : Crank and chainring made of aluminum alloy, light weight, high axial strength and compatibility
- Note:These crank and chainring are only suitable for single speed.Suitable for most mountain bikes ,Compatible With Shimano Sram FSA
Last update on 2026-02-22 / Affiliate links / Images from Amazon Product Advertising API
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- Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 104 Bcd Crank Arms.
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FAQ:
Q: What does 104/64 BCD mean on a chainring?
A: On triple cranks, and on most mountain 2×10 (and 2×11) set-ups, there are 2 Bolt Circle Diameters — one for the large ring (or rings), and one for the small chainring. In this case, they are usually designated as something like 104/64 BCD. That means 104 mm bolt circle diameter for the larger ring,…
Q: How many BCDs do I need for a 2×10 bike?
A: Most road and cyclocross doubles have just one BCD where both the large and small ring mount. However, that is not always the case. On triple cranks, and on most mountain 2×10 (and 2×11) set-ups, there are 2 Bolt Circle Diameters — one for the large ring (or rings), and one for the small chainring.
Q: What is the diameter of a BCD bolt?
A: In this case, they are usually designated as something like 104/64 BCD. That means 104 mm bolt circle diameter for the larger ring, and a 64 mm diameter for the smaller ring.
Q: What does BCD mean on a motorcycle?
A: What is BCD? BCD is an acronym for Bolt Circle Diameter. It’s the measurement (diameter) of an imaginary circle passing through the centers of all the bolts in a round pattern – like chainring bolts that hold the rings to the crank.