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Old 04-27-09, 07:46 PM   #1
cen27
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3-piece cranks: mongoose freestyle bmx

hello i am new to bikes...again.

i bought a mongoose freestyle bmx (not sure what model, i know its a mongoose but i always wanted one since i was a kid) some time back and now i want to change the stock cranks to a 3-piece cranks. just for show really. im not looking for performance, i dont race, i dont know the brands, i just want something that will work and not brake while i cruise down the beach and around downtown. what works/fits and what should i be looking to pay for this?

thank you for your time.
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Old 04-27-09, 10:43 PM   #2
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You won't break any three-piece cranks unless you crash the bike over and over hard or you're landing hard on the ramps. Anyway, your best bet is to check out Dan's Comp and shop accordingly. You can get good cranks from Eastern for as little as $80. You'll need to usually buy a BB too, so keep that in mind when choosing a crank set.
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Old 04-27-09, 10:51 PM   #3
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thanks

thanks for the fast reply. i keep hearing BB, what is bb anyways? also will need to buy the sprocket spereatly?
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Old 04-28-09, 01:23 AM   #4
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nvm.

Last edited by g3ck0; 04-28-09 at 09:03 AM.
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Old 04-28-09, 04:13 AM   #5
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BB = bottom bracket, which is the bit in the frame where your cranks go through, along with the bearings and associated hardware contained therein. BB is not "ball bearings".
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Old 04-28-09, 05:55 AM   #6
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and you dont necessarily need a new sprocket...you can take it off of your current cranks no problem.
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Old 04-28-09, 08:46 AM   #7
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ball bearings????
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Old 04-28-09, 08:54 PM   #8
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BB stands for bottom bracket, not ball bearings. And unless your sprocket is bent, you don't need a new one. Mine is bent though.
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Old 04-29-09, 08:24 AM   #9
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one last question. is there a standard size when it comes to the bottom bracket or is there a size i will need to fit my mongoose?

thanks every one your all so helpful.
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Old 04-29-09, 09:34 AM   #10
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OP said they want to change to 3 piece cranks, so it is possible that the bike has a 1pc crank. If that is the case, a bottom bracket conversion kit is needed to adapt from american to euro style bottom bracket to run 3pc cranks
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Old 04-29-09, 10:20 AM   #11
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There is no "need" for a conversion kit to make your bottom bracket compatible with "euro" in order to run 3 piece cranks, 3 piece cranks are available for all sorts of bottom bracket styles. The euro conversion is one possible option but is not the most cost effective.

It is reasonable to assume that the OP has one piece cranks as there would be no reason for him to post the question otherwise. One piece cranks are only used on bikes with an "American" bottom bracket. So the most straight forward conversion would be to buy 3 piece cranks that come complete with an American bottom bracket. If it is just for show then it doesn't get much cheaper than this http://www.danscomp.com/451053.php?cat=PARTS
You may want to spend a bit more and get a sealed bearing bottom bracket.
Once you get the cranks there are plenty of sites that have the installation instructions.

Keep in mind that the pedals off a one-piece crank use a 1/2 inch thread and a 3 piece uses 9/16 so you would need new pedals as well.
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Old 04-29-09, 11:59 AM   #12
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Euro is crap, never run euro on bmx.
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Old 04-29-09, 01:29 PM   #13
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word. the bearings are wayyyyyyyyyyyy too small. i dont really even like spanish bearings.
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Old 04-29-09, 01:39 PM   #14
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Euro is crap, never run euro on bmx

Spoken like a true non-racer. Euro is the standard for modern BMX race frames and has been the mountain bike standard for years.
As the bearings are smaller they wear quicker than an American, Spanish or Mid bottom bracket but they are lighter, easy to install, spin like a top, and can be replaced in minutes. The first generation with only a single bearing on each end tended to wear very quickly but now most have two bearings per side and last a lot longer. They have their place in the BMX world and are definetly not crap.
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Old 04-29-09, 02:59 PM   #15
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They belong in the mountain bike world, i wouldn't even run euro on my race bike. The minimal weight saving is not worth losing the strength and durability of a mid, or even Spanish bearing.
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Old 04-29-09, 03:40 PM   #16
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Good luck with that.
None of the race frame manufacturers use anything but Euro. You may be able to source an older frame with an American BB but certainly not mid or spanish.
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Old 04-29-09, 04:21 PM   #17
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I see that, and I think that is rather unfortunate.
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Old 04-29-09, 06:50 PM   #18
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I thought Standard still made an American BB frame, but I searched and it was wrong. But I know the FBM Camaro had a Mid BB. But like andymac said, Euro BB's are easily the most popular BB in racing, and they are very easy to install.
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Old 04-29-09, 09:02 PM   #19
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Yeah, because a mid, or spanish bb is so difficult to press into the frame...
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Old 04-30-09, 06:02 AM   #20
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i can see where threading the bearings right into the frame would be enjoyable, just because of the ease of installation, but i still think they arent strong enough. race bikes and mountain bikes only. not on any other use of a bmx bike. not even if its just for show.
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Old 04-30-09, 01:55 PM   #21
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Quote:
Originally Posted by FuzzyRyder View Post
Yeah, because a mid, or spanish bb is so difficult to press into the frame...
I'm not disagreeing with you, because I think race frames should use a Mid or Spanish BB too. My American Profile BB just slides right in and out of my old frame.
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Old 04-30-09, 02:27 PM   #22
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its that loose?
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Old 04-30-09, 05:15 PM   #23
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Yeahhh. It works perfectly fine though.
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Old 05-01-09, 01:35 AM   #24
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Fbm!
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Old 05-01-09, 05:09 AM   #25
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Their race frame is nice.
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