Originally Posted by
veganbikes
Ashtabula doesn't belong anywhere except the annals of history. Maybe a good idea back in the day before they figured out square taper/splined and then external bottom brackets but I wouldn't waste the time and money trying to adapt an outdated standard to a modern bike. There are some conversions from Ashtabula to English threading but I have not really seen one to go backwards because you cannot do so in an English threaded bottom bracket and nobody would buy a T47 bottom bracket shelled bike to put some outdated cranks on.
Plus Ashtabula would not be very sturdy or strong for mountain biking hence why you don't ever see a real mountain bike with them. Certainly wally-mart specials that say not for "off-road usage" but there is a reason for that.
I think you're missunderstanding me a bit, which might be my fault. I'm not trying to fit ashtabula cranks to a bike with an english bb.
The three I currently have are ashtabula style bmx three piece cranks. They came from bmx bikes that are basically... either high end cheapo bmx bikes, or mid level bmx bikes. I don't know how to place them. But all three bikes they came from had american bbs.
One of them came from this weird Specialized bmx bike, that wasn't a regular tube frame bike, it had this weird space frame. It had a bb that looks like the one in that guys first picture; two sealed bearings you press in after removing the bearing cups, a splined axle with a nut on one side. It uses a typical bmx chainring.
The other two came off what are best described as bso bmx bikes. I think one was a Mongoose, maybe both, but one was spray painted. Their cranks were basically 3pc ashtabula cranks. Picture a regular ashtabula, except the crank arms slide on. The axles on these install just like a regular ashtabula crank
found a picture of what I'm poorly trying to explain. They are
these style conversion.
Although the one I took off the Specialized is going on a klunker, the other two are not going on anything I intend to offroad. One is going on cruiser that I'm converting to a freewheel, sort of like a strandie. What I want is what that other guy wants, a bmx crankset for an english bb, not a downgrade to any kinda ashtabula. My Rincon is one of my street fighters, it's got a 48/16 ration and rides on narrow street tires. I also have a LaJolla which I was also considering slapping one on—it also has an english bb.
Sorry for all the confusion about it all. I was just trying to explain what I had versus what I was looking for.