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Phil BB chainline question

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Phil BB chainline question

Old 03-13-06, 08:18 PM
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Grimlock
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Phil BB chainline question

My cranks call for a 109mm spindle for "optimal" chainline.
Phil Wood makes 108 and 111. I know the cups are adjustable 2.5mm laterally each way. Both will get me to the magic 109. Does it matter if I choose the longer or shorter version?
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Old 03-13-06, 08:28 PM
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Look closely at your existing setup to see what you have for chainring and non-drive side crank arm clearances to both chainstays - unless you are building this up on a new frame and don't have a reference.

If it is too short you could have a problem with the inner chainring and the chainstay. But 1 mm is pretty small - so it would probably work in that regard, and 1 mm is not a big deal. Since with the Phil you can move it either way, you can split the 1 mm each side, so only losing 0.5 mm. By getting the longer spindle you could get the right chainline and have an extra 2.1mm on the non-drive side. You will not notice 0.5 mm difference in chainline.
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Old 03-14-06, 11:25 AM
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For reference, this is going on my Surly Steamroller with Sugino 75 cranks and a 47 tooth ring.
I figured it wouldn't be a huge deal either way but it's better to ask first and potentially save myself a huge headache.
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Old 03-14-06, 12:19 PM
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Actually most of your extra length is going to end up on the L side as by the time you fix the chain line to the desired spot it will shift the axle to the left for the longer crank, one of the nice things about Phil BB (or White Brothers) is that this is possible.
You can have a mm or a bit on the R, but most or all will be on the L. If an extra 3mm of exposed axle doesn't bother you (and you won't notice it riding the bike) the longer axle would be ok. The shorter axle would snug your L side crank up against the BB, a normal situation with double CW set ups.
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Old 03-14-06, 07:24 PM
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Email the folks at PW and ask them which one they recommend for your set up. Brent and crew will be more then happy to get you the right spindle for the job.
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