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Old 08-10-07, 11:53 AM   #1
sundersledge
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Fixed Gear Chainline / BB Spindle Length

I am hoping to use an older Dura-Ace Crankset for a fixed gear set-up (on a track bike.)

Budget fix for the first little and will upgrade parts as I have $.

Since the track hub and cog in the back will give a 42mm chainline, I will most likely need to run the chainring on the inside (of the double crank.)

I believe the spindle length for this crank set is a 109 for a 43mm chainline (on a road bike set-up.)

does anyone know where this would put the chainline of the inner chainring and the outer chainring? (assuming that the 43 is the center of the two double chainrings?)

If I wanted to run on the outer chainring, could i just get a smaller spindle length BB (107, 105?)

Will I run into problems with putting this crankset on a smaller BB?

I know the correct answer is to go to my LBS but I would just as soon build this on my own and learn some lessons...

Thoughts?
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Old 08-11-07, 06:56 AM   #2
Soil_Sampler
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How old dura ace?

Quote:
Originally Posted by sundersledge View Post
I am hoping to use an older Dura-Ace Crankset.
I believe the spindle length for this crank set is a 109 for a 43mm chainline (on a road bike set-up.)
FC-7700 uses a 109.5 octalink BB
FC-7410 uses a square taper 103mm BB
http://www.sheldonbrown.com/chainline.html#standards
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