What size bottom bracket?
01-07-15, 08:57 PM
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What size bottom bracket?
Found a like-new Sugino triple crank I want to use. It's stamped "XD2" inside the arms. Anybody know what size BB I would need for a 45mm chain line (middle ring)?
It's for a 68mm shell (Soma "Double Cross").
Thanks!
It's for a 68mm shell (Soma "Double Cross").
Thanks!
01-07-15, 09:27 PM
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01-07-15, 09:27 PM
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01-07-15, 09:29 PM
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Rivendell sells these and this is what they say:
On road bikes with straight (normal) chain stays, mount it on a 107 to 110mm bb. If your bike has bowed-out chain stays like most mountain bikes, it'll need a 113mm. Unlike most cranks, it also comes in a 165mm arm length.
01-07-15, 10:26 PM
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Setting up a crank and a drivetrain is about more then just chainline specs. I agree that matching chain lines are a good goal but not written in stone. Clearance for arms and stays, for rings and stays take first priority. Any spindle length I read of is but a starting point, sometimes it needs to be different from claims. Andy.
01-08-15, 12:37 PM
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I use that crankset on a Surly Cross Check, similar to your Double Cross, with a 130mm rear hub. I use a 110mm bb. I have not measured it, but it seems to line up the middle ring very nicely with the center cog of my 9-speed cassette. If you are using a 135mm mountain hub, I expect you will need a 113mm bb.
01-08-15, 02:32 PM
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+1) Chainline in the front is dependent on what the chainline measures in the Back .
something Yo may have to calculate Yourself.
something Yo may have to calculate Yourself.
01-08-15, 04:09 PM
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Exact chainline is unnecessary, especially for a derailleur-equipped bike. Reasonably close is what you want, with clearance between the chainring and frame and ability to run smoothly in all gears.
01-08-15, 04:25 PM
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01-08-15, 06:27 PM
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So is it certain that different spindle lengths differ the same amount on each side of the spindle?
If so, either 107 or 110 seem to be OK for a 45 mm chain line:
107 --> 47.5 - 3 (difference from 113 bracket on one side) = 44.5 chain line.
110 --> 47.5 - 1.5 (") = 46 chain line.
107 being "most ideal."
If so, either 107 or 110 seem to be OK for a 45 mm chain line:
107 --> 47.5 - 3 (difference from 113 bracket on one side) = 44.5 chain line.
110 --> 47.5 - 1.5 (") = 46 chain line.
107 being "most ideal."
01-08-15, 06:31 PM
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So is it certain that different spindle lengths differ the same amount on each side of the spindle?
If so, either 107 or 110 seem to be OK for a 45 mm chain line:
107 --> 47.5 - 3 (difference from 113 bracket on one side) = 44.5 chain line.
110 --> 47.5 - 1.5 (") = 46 chain line.
107 being "most ideal."
If so, either 107 or 110 seem to be OK for a 45 mm chain line:
107 --> 47.5 - 3 (difference from 113 bracket on one side) = 44.5 chain line.
110 --> 47.5 - 1.5 (") = 46 chain line.
107 being "most ideal."
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