Another stupid chainline question...
#1
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Another stupid chainline question...
I'm converting an older Raleigh road frame into a single speed. The rear hub is 126mm with a spin on freewheel. I'm thinking of getting the cheap Origin8 cranks which according to the website work with 103-107mm spindles. Would a cheap 107mm UN54 BB give me an acceptable chainline with this crank/hub setup? I've been reading threads for the last hour trying to figure it out, but I'm still not sure. Any help, suggestions, info, and insults are welcomed.
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They reason you did not get any replies is because you did not provide enough information for anyone to help you.
But let me help you, help yourself.This should have all the information you need to know about chainline. Good luck.
But let me help you, help yourself.This should have all the information you need to know about chainline. Good luck.
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They reason you did not get any replies is because you did not provide enough information for anyone to help you.
But let me help you, help yourself.This should have all the information you need to know about chainline. Good luck.
But let me help you, help yourself.This should have all the information you need to know about chainline. Good luck.
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First thing: Measure the chainline of the hub. Sheldons page will tell you how to do that.
Second: Figure out the chainline for the crank/BB combo.. I don't remember off the top of my head but I believe the 103mm gives a 42mm chainline with the origin8s .. the site selling will usually list, but u can also ask.
Third: With a square taper BB you can adjust the spindle length to match up with you hub (as long as it is not too short for clearance issues).. so if you need a 45mm chainline take the delta (3mm) multiply by 2 and add it the base known chainline spindle (eg 103 would use 109 for 3 more mm)
Second: Figure out the chainline for the crank/BB combo.. I don't remember off the top of my head but I believe the 103mm gives a 42mm chainline with the origin8s .. the site selling will usually list, but u can also ask.
Third: With a square taper BB you can adjust the spindle length to match up with you hub (as long as it is not too short for clearance issues).. so if you need a 45mm chainline take the delta (3mm) multiply by 2 and add it the base known chainline spindle (eg 103 would use 109 for 3 more mm)
#8
Your cog is slipping.
You're correct. A 103mm bb will give you 42 with the chainring on the inside and 107 will put your ring on the outside on those Origin 8 cranks. Same as Bulletproofs.
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