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3pc cranks or 1pc

Old 12-27-04, 08:51 PM
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Why do people put such big stock in 3-piece cranks?

Honestly, half the information here is at least partway wrong and PNJ and Beerman have about the only level heads (a few others as well, sorry).

1 piece cranks are fine, there is nothing wrong with them ESPECIALLY if you aren't breaking them and having problems with your bearings all the time. If it ain't broke - don't fit it!

The bottom line is that cheap 3-piece cranks (like Redline forged chromoly) will break and fall apart on you and snap. So, if you DO eventually upgrade, you really must get high quality (READ: PROFILE!) 3-piece cranks which will be about $150.00 or so.

But, that may be almost as much as your bike cost. It also should be noted that while the 3-piece cranks may be a tiny bit lighter and a lot stronger, they will not be faster than 1-piece cranks with loose ball bearings that are setup properly.

So, enjoy your 1-piece cranks, they will almost definitely NOT snap on you ever and may eventually bend... But, until they do, ride them and save your money!
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Old 12-27-04, 09:01 PM
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Originally Posted by BMXTRIX
Why do people put such big stock in 3-piece cranks?
I'll tell you why they put so much stock in them: the media. When I was younger, I always lusted for three-piece cranks because BMX Plus! was putting out articles in nearly every issue about how one-piece cranks bend easily and putting "one-piece cranks" as a negative factor on all their reviews, even though for the cheapest of completes.
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Old 12-28-04, 10:49 AM
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If your noy having any trouble with the ones u have dont bother replacing them. If I was to use 1pc crancks i would probably just bend them in half. it just depends on the type of riding you do. I dont see y they wouldnt fit your frame. Have fun ridin MAVE
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Old 12-29-04, 06:43 AM
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thanks, im probably gonna get a 3pc crank, either a profile one or a demolition, but whats the difference between a EURO bb and a US bb, ?

thanks
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Old 12-30-05, 01:39 PM
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How Would You Change A 1pc Ti A 3pc? Would Any 3pc Fit My Eastern 9volt
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Old 12-30-05, 02:26 PM
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Originally Posted by bartle
How Would You Change A 1pc Ti A 3pc? Would Any 3pc Fit My Eastern 9volt
Please don't type in all caps.
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Old 12-30-05, 02:27 PM
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And don't bring back threads from a year ago.
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Old 12-30-05, 03:01 PM
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Good point. Tommo never stayed around for the BB answer anyway. 2 posts was all he wrote.
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Old 12-30-05, 09:14 PM
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3-Pieces are alot better then any 1-piece crank.
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Old 12-31-05, 10:50 AM
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i got happy when i saw the top of this thread because i saw bmxtrix...then i read the date
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Old 12-31-05, 12:33 PM
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Little more on the subject, only not really adding anything new. Found at:
https://www.crackedfork.com/letters21.html

WHO CARES ABOUT WHAT'S LIGHT, CARE ABOUT WHAT'S STRONG

from byker18@hotmail.com (John Wyatt)...

Q: Hey, I'm a vert/street rider and I was wondering what's lighter, having 1-piece cranks on your bike or 3-piece? All I've ever ridden is bikes with one piece and I know 3-pc are stronger, but what's lighter?

A: Depends on the cranks you're comparing. Generally though, 3-piece cranksets tend to be the lighter, and the stronger. 1-piece cranks are heavy because they're cast into a solid, single piece of steel, hence the name. Manufacturing them is very low cost, but it also makes them quite heavy and though most of the casting is extremely strong, it has some very weak areas. One weak point is where the left crank arm bends sharply to form the 'spindle', it's a very small kink, and very weak. Another problem area is at the ends of the crank arms where the pedal spindles thread into. Because the solid casting is very heavy, it's made as skinny as possible, hence the smaller pedal spindle size of 1-piece cranks, another weak area. Whereas, 3-piece cranks consist of three separate pieces, the spindle, and the two arms. The strongest of these types have tubular chromemoly steel crank arms, which because they're made from tubes, they're hollow and light. They're also overall much stronger than a 1-piece crank, and noticeably stiffer (there are also solid aluminum 3-piece, but they lose their weight advantage by having to increase their size to make up for the weaker metal, but they're cheaper to make). Manufacturing them is a bit complicated though, and because of this you end up with a product than can cost 5 to 10 or even 20 times as expensive as a 1-piece crank. Up until recently, I've always used 1-piece cranks just because I felt ripped off by the over-$100 3-piece cranks, when I could be riding my bike for $15 with a set of 1-piece, which also have the advantage of never coming loose (there's nothing to come loose since it's all one piece). Unfortunately, they only last about a year, and when they fail, sometimes they fail in a big way. Once I tore muscles in my hip/upper thigh area, cranking hard on the street from a dead stop trying to sprint through red light traffic. The 1-piece arm snapped off with the pedal still attached, ricocheting ahead of me through the intersection, and overextending my leg violently. I didn't realize I was injured at all until I got home, and tried to climb my stairs, but I couldn't lift my leg at all, for whatever muscle or tendon combination that lifts the leg was obviously not connected anymore. Ouch. I had to literally lift my leg up with my hands for every step! I have 3-piece cranks now, the ultra burly PROFILE SS cranks, but they're so extra beefy that they actually weigh 1.5lbs. HEAVIER than my 1-piece Odyssey Excalibur's (one of the best 1-piece)! So, to answer your question, generally 3-piece cranks are lighter than 1-piece, but not always.
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Old 12-31-05, 01:53 PM
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I can't believe that that site is still up. It hasn't been updated since '98 or '99.
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Old 12-31-05, 04:27 PM
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three piece cranks arent usually lighter....but not much heavier and there stronger...i think
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Old 12-31-05, 05:49 PM
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There will always be a compromise between weight and strength. But stiffness counts too. Regardless of how strong anyone thinks a 1 piece is, they're worthless for racing. Unless you're 5.
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Old 01-02-06, 09:30 PM
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Originally Posted by Dr. Pimper
Yeah, that's what she said.
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Old 01-09-06, 06:53 AM
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I've got profile tubular chromemoly 3 pc crank on my GT.

Big me up.

wewt.
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