Would you like to learn about the various BMX crank types?
There are four styles available: 3-piece, 2.5-piece, 2-piece, and 1-piece.
Which is the most common BMX crankset style?
3-piece.
I explain below what the main differences are between them.
But I received the most questions about the 2.5-piece crank type, which is a more modern style.
My recommendation: 2- (quickest installation) and 3-piece cranksets are the most reliable.
And absolutely never go with a 1-pc version.
Even if you’re buying a complete BMX and it has a 1-pc spindle – JUST don’t!
Unless you are absolutely using your BMX just for cruising around and are a lighter or younger rider.
Note: Don’t miss checking my ultimate collection of BMX cranks for every rider.
4 Different BMX Crank Types
3 Piece BMX Cranks Explained
A 3-piece crank is the most common amongst riders these days.
It consists of three separate pieces: two crank arms and a (splined) spindle.
You tighten each crank arm to the spindle with a bolt, which presses it together for smooth riding.
Note: Don’t tighten it too much because it’ll put too much pressure on the bearing and the cranks won’t spin as they should.
My top 3 piece BMX crank recommendations:
2.5 Piece BMX Cranks Explained
A 2.5 crank type is a more modern solution that, unlike a 2 piece crank, still has three separate parts.
The difference between a 2 and a 2.5 pc crankset is that the former has one arm integrated onto the spindle (or vice versa) and the latter has a moving one, with a “riveted system” at the end.
This allows you to change individual arms, whereas, with a 2-pc, you cannot.
My top 2.5 piece BMX crank recommendation:
2 Piece BMX Cranks Explained
A 2-pc BMX crank consists of a separate crank arm and an integrated spindle into the other crank arm.
This offers the quickest installation process, which is a big plus for me.
Downside: You cannot replace just the arm, but the whole set if you break or grind through the crank arm that’s integrated with the spindle.
My top 2 piece BMX crank recommendations:
1 Piece BMX Cranks Explained
NOT. RECOMMENDED.
These are becoming less and less popular but you can still see a 1-piece crankset on children’s bikes and cheap BMXs.
Both crank arms and the spindle are all one piece. (Nope, not even close to as strong as 2-3-piece cranks.)
I still remember how often did I need to fix my cranksets and bottom bracket when I first started riding BMX with a one-pc crank.
SUCKS!
Compatible Crank Bottom Brackets
Yes, these are also different types of BMX bottom brackets.
2-3 Piece Cranks
You’ll predominantly need a Mid bottom bracket for the majority of frames. (Be careful that you pick the right size because crank spindles vary in size (19mm, 22mm, 24mm).)
But, for instance, some Fly Bikes frames require a Spanish BB (so make sure you read specs and get the right size bearing.)
1 Piece Cranks
A bottom bracket in this case should be an American style – others do not fit.
Note: I also have a collection of the best and most quality BMX bottom brackets.
FAQs About BMX Crank Types
What are the main types of BMX cranks?
The main types of BMX cranks are 3-piece, 2-piece, and 1-piece cranks. 3-piece cranks consist of two individual crank arms and a spindle, offering high strength and ease of maintenance. 2-piece cranks have one crank arm and the spindle forged as a single piece, with the second arm being separate. 1-piece cranks are formed from a single piece of steel, curving around the bottom bracket, and are typically found on entry-level bikes.
How do I choose the right BMX crank length?
BMX crank length varies usually between 160mm to 180mm. Shorter cranks (160-170mm) provide better clearance for tricks and are preferred for street and park riding. Longer cranks (170-180mm) offer more leverage and are suited for BMX racing, trails or taller riders who need more pedaling power.
Are BMX cranks interchangeable among different types of BMX bikes?
Generally, BMX cranks are interchangeable among different BMX bikes, but compatibility depends on the bottom bracket size and type in your frame.
What materials are BMX cranks made from, and how do they differ?
BMX cranks are primarily made from steel or chromoly. Steel cranks are durable and affordable, making them suitable for entry-level bikes. Chromoly cranks offer a great balance of strength, durability, and lighter weight, ideal for freestyle and competitive riding.
How can I maintain my BMX cranks to ensure their longevity?
Regular maintenance includes keeping the cranks clean, checking for any signs of wear or damage, ensuring all bolts are tight and properly torqued, and periodically checking the bottom bracket for smooth operation. Lubricating the spindle and bottom bracket interface can also help prevent corrosion and wear
What is a 3-piece BMX bike crank?
A 3-piece BMX crank consists of two separate crank arms and a removable spindle, secured with bolts. They’re the most common type today because they’re strong, durable, and easy to replace, maintain, or upgrade.
1-piece crank vs 3-piece – what’s the difference?
A 1-piece crank is made from a single bent steel rod, usually found on cheaper or older BMX bikes, while a 3-piece crank has two separate arms and a spindle. 3-piece cranks are much stronger and easier to upgrade, making them the standard for modern BMX bikes.
What are 8 spline BMX cranks?
8-spline BMX cranks use an 8-groove spindle interface to connect the arms, making them simple and affordable. They’re not as strong as 48-spline cranks, but they work fine for beginners or lighter riding.
What are 48 spline BMX cranks?
48-spline BMX cranks use a 48-groove spindle interface that provides a super strong, precise, and secure fit. They’re the standard for high-end BMX cranks because they resist twisting, stay tight, and handle heavy riding.
