Chain Line on Shimano Ultegra CS6500 9-speed cassette
10-14-13, 12:23 PM
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Chain Line on Shimano Ultegra CS6500 9-speed cassette
Does anyone know what the chain line should be with a Shimano Ultegra 9-speed rear cassette if the rear spacing is 130mm? I can't measure it because the frame is being made and I would like to order some of the components ahead of time. Right now I'm trying to figure out the bottom bracket spindle length for an appropriate chain line.
10-14-13, 12:35 PM
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Here's a link to Sheldon Brown's chain line cheat sheet.
Or you can do it in your head.
A 9s cassette is about 37mm wide. Allowing 3 mm clearance to the dropout it needs about 40mm total, so the center is about 20mm from the dropout or 45mm from the centerline of the frame (130mm/2 -20mm). So target chainline is 45mm.
If you're like me, you tend to spend most of your time on the outer ring, with the outer end of the cassette so you might go a bit higher to 47 or 47mm so you get the best chainline in the combinations you ride the most, but don't get carried because it comes at the expense of chain line at the other end.
Or you can do it in your head.
A 9s cassette is about 37mm wide. Allowing 3 mm clearance to the dropout it needs about 40mm total, so the center is about 20mm from the dropout or 45mm from the centerline of the frame (130mm/2 -20mm). So target chainline is 45mm.
If you're like me, you tend to spend most of your time on the outer ring, with the outer end of the cassette so you might go a bit higher to 47 or 47mm so you get the best chainline in the combinations you ride the most, but don't get carried because it comes at the expense of chain line at the other end.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
10-14-13, 02:23 PM
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Here's a link to Sheldon Brown's chain line cheat sheet.
Or you can do it in your head.
A 9s cassette is about 37mm wide. Allowing 3 mm clearance to the dropout it needs about 40mm total, so the center is about 20mm from the dropout or 45mm from the centerline of the frame (130mm/2 -20mm). So target chainline is 45mm.
If you're like me, you tend to spend most of your time on the outer ring, with the outer end of the cassette so you might go a bit higher to 47 or 47mm so you get the best chainline in the combinations you ride the most, but don't get carried because it comes at the expense of chain line at the other end.
Or you can do it in your head.
A 9s cassette is about 37mm wide. Allowing 3 mm clearance to the dropout it needs about 40mm total, so the center is about 20mm from the dropout or 45mm from the centerline of the frame (130mm/2 -20mm). So target chainline is 45mm.
If you're like me, you tend to spend most of your time on the outer ring, with the outer end of the cassette so you might go a bit higher to 47 or 47mm so you get the best chainline in the combinations you ride the most, but don't get carried because it comes at the expense of chain line at the other end.
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