3-piece cranks: mongoose freestyle bmx
05-01-09, 08:16 AM
#27
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good morning people.
i picked out my crank set based on the info i got here. anyways i was removing my brake levers and broke the plastic off that holds them around to the bars. i started looking a lever and was wondering if i got mini's/small (size) would these fit my adult size small hands or these made for 7 yr old hands?
i picked out my crank set based on the info i got here. anyways i was removing my brake levers and broke the plastic off that holds them around to the bars. i started looking a lever and was wondering if i got mini's/small (size) would these fit my adult size small hands or these made for 7 yr old hands?
05-02-09, 02:36 AM
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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 https://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.
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 https://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.
05-02-09, 06:29 AM
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1. trigger levers are just for one or two finger use. you're able to keep more of your hands on the grip.
2. guy right above me, there is a huuuuuuuuuuuuuuuuuuuuuuuuuuge difference in the bearing sizes
2. guy right above me, there is a huuuuuuuuuuuuuuuuuuuuuuuuuuge difference in the bearing sizes
05-02-09, 09:42 AM
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American BB have much larger bearings, are pressed in, and last a lot longer if they're sealed.
European BB have really small bearings, are threaded in, and don't have the lifetime of anyother kind of bearings.
European BB have really small bearings, are threaded in, and don't have the lifetime of anyother kind of bearings.
05-12-09, 12:57 PM
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to fit three-piece onto a frame that uses a one-piece crank (ashtabula) you'll need a bottom bracket converter... it's a simple thing, usually plastic and metal, sometimes a single cnc-machined piece, that slips into the larger ashtabula bracket to fit the narrower axle of a three-piece.
like this:
https://www.sheldonbrown.com/harris/opc.html
(scroll down to 'american to euro converter')
like this:
https://www.sheldonbrown.com/harris/opc.html
(scroll down to 'american to euro converter')
05-12-09, 03:06 PM
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Can you somehow knock the sealed bearing housing out of the american cups?
05-12-09, 03:41 PM
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Ehhh. I'm not sure. You might be able to though because an American BB is just a Mid with cups.
05-12-09, 04:42 PM
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Yes you can take the cups off. no need for a conversion kit either. just buy the bottom bracket you need.
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05-12-09, 06:20 PM
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https://www.sheldonbrown.com/harris/opc.html
(scroll down to 'american to euro converter')
(scroll down to 'american to euro converter')
05-12-09, 06:55 PM
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If I want to convert from American to Mid, I would need some kinda conversion kit so that the mid will sit good inside the frame?
05-12-09, 07:28 PM
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Converting American to Mid doesn't make sense. A Mid BB is just an American without the cups.
05-12-09, 10:28 PM
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Mid and american are the same thing, just american has the cup like mini said.
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05-13-09, 07:33 AM
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That is right the bearings are the same ,The cup is what converts it to american size
05-13-09, 10:15 AM
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ok, maybe I'm confused but if the bearings are the same size, if I decide to NOT use the American cups, would it STILL fit snuggly inside the frame?
05-13-09, 10:22 AM
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You need to used whatever size bottom bracket shell your frame has. if its American you need the cups. mid you dont.
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05-13-09, 11:28 AM
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interesting, i didn't realize the cups are what make an american BB sized-right for one-piece (ashtabula) cranks... or that without them, you'd be left with an otherwise standard BB.
i know for a fact i've been able to loosen the cups on a bmx frame with a flathead screwdriver and a hammer before... i was just curious... what bottom brackets fit bmx frames once you've removed the cups? examples? links? i'm quite curious about this now, since everyone else i've asked says you need the converter.
i know for a fact i've been able to loosen the cups on a bmx frame with a flathead screwdriver and a hammer before... i was just curious... what bottom brackets fit bmx frames once you've removed the cups? examples? links? i'm quite curious about this now, since everyone else i've asked says you need the converter.
05-13-09, 12:28 PM
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Mid bottom bracket.
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05-13-09, 03:01 PM
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The Ride Tech Articles on this link will answer most questions
https://www.gsportbmx.com/tech/
https://www.gsportbmx.com/tech/
05-13-09, 03:40 PM
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sealed bearings
Hey I just recently bought new 3 piece crank, and it came with sealed bearings but they have thise black casing around them, I was wondering if that is supposed to come off or if it is supposed to stay on when installing it. Because it does not fit with the casing. Please respond soon.
