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I'm restoring an antique BMX...
.... and know *squat* about that kind of gear. Anyone know BMX and
want to give advice? Right now, I'm shopping eBay for a crank. Are the "spiders" generally interchangable across crank arms? I see generic spiders for sale without any crank mentioned. Also, it looks to me like the spindle tapers are quite different in that branch of the industry. Anybody wanna talk about matching crank arms, spiders, and BBs on an old BMX? Actually, it's a Littlejohn tandem that I'm setting up to go with us when we travel. It'll be kept pretty straight and level (as opposed to freestyle, jumping, etc), but I kinna want it to be BMXey... I don't think "BMXey" is in the dictionary; my spell checker is havin' a cow! Jones |
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I'm restoring an antique BMX...
!Jones wrote:
... and know *squat* about that kind of gear. Anyone know BMX and want to give advice? Right now, I'm shopping eBay for a crank. Are the "spiders" generally interchangable across crank arms? I see generic spiders for sale without any crank mentioned. Also, it looks to me like the spindle tapers are quite different in that branch of the industry. Anybody wanna talk about matching crank arms, spiders, and BBs on an old BMX? Actually, it's a Littlejohn tandem that I'm setting up to go with us when we travel. It'll be kept pretty straight and level (as opposed to freestyle, jumping, etc), but I kinna want it to be BMXey... I don't think "BMXey" is in the dictionary; my spell checker is havin' a cow! Jones see what you can figure out from danscomp.com - it's bmx central. |
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I'm restoring an antique BMX...
On Sat, 11 Aug 2007 07:49:39 -0700, in rec.bicycles.tech jim beam
wrote: !Jones wrote: ... and know *squat* about that kind of gear. Anyone know BMX and want to give advice? Right now, I'm shopping eBay for a crank. Are the "spiders" generally interchangable across crank arms? I see generic spiders for sale without any crank mentioned. Also, it looks to me like the spindle tapers are quite different in that branch of the industry. Anybody wanna talk about matching crank arms, spiders, and BBs on an old BMX? Actually, it's a Littlejohn tandem that I'm setting up to go with us when we travel. It'll be kept pretty straight and level (as opposed to freestyle, jumping, etc), but I kinna want it to be BMXey... I don't think "BMXey" is in the dictionary; my spell checker is havin' a cow! Jones see what you can figure out from danscomp.com - it's bmx central. As near as I can tell, the spider/single chainring interchange limited by the size of the center hole. |
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I'm restoring an antique BMX...
!Jones wrote:
Right now, I'm shopping eBay for a crank. Are the "spiders" generally interchangable across crank arms? I see generic spiders for sale without any crank mentioned. Also, it looks to me like the spindle tapers are quite different in that branch of the industry. Today's BMX crank spindles are not tapered; this is to accommodate widely different thicknesses of chainring and to allow easy adjustment of chainline. The arms are fixed axially by bolts into the spindle ends, then clamped onto the spindle with pinch bolts. A few use a press-fitted, fine pitch spline that likewise does not have a taper. Adapter spiders for BMX cranks are outdated but still available to some degree. Since their design, if not their manufacture, is contemporary with the prevalent use of one-piece cranks, they all have 15/16" bores (like steel plate chainrings or older aluminum rings). More up-to-date three-piece cranks with 3/4", 7/8", 19mm, or 22mm spindles are adapted to chainrings with 15/16" bores by the use of small stepped ring spacers that are often furnished with both the crank and the chainring: http://www.danscomp.com/457004.php?cat=PARTS Chainrings of newer manufacture (about the past 10 years) are likely to have a 22mm bore and come with an adapter to fit 19mm spindles. Chalo |
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