Assembly order of Shimano Cassette
10-30-06, 10:23 AM
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Assembly order of Shimano Cassette
I've never put a cassette on a hyperglide hub before so I just want to confirm the order of assembly -- much to my surprise I can't find a picture showing this.
I'm installing a 7-speed cassette on an 8/9 speed hub. The picture shows the 4 items that came with the cassette (this is not my cassette but a picture I found that shows each of the components). 1 is the cassette, 2 is a thin spacer(?), 3 is the small sprocket, and 4 is the lock ring. I obtained a 4.5 mm spacer (not pictured) and placed that on the hub first. I removed the screws holding the cassette (1) together so it would lay flat on the spacer and then pretty much just started stacking things on. The order is:
4.5 mm spacer
Cassette minus the three screws (1)
Thin spacer (2)
Sprocket (3)
Lock Ring(4)
It looks right to me, but I want to be sure before I apply 30 ft/lbs.
Bob
I'm installing a 7-speed cassette on an 8/9 speed hub. The picture shows the 4 items that came with the cassette (this is not my cassette but a picture I found that shows each of the components). 1 is the cassette, 2 is a thin spacer(?), 3 is the small sprocket, and 4 is the lock ring. I obtained a 4.5 mm spacer (not pictured) and placed that on the hub first. I removed the screws holding the cassette (1) together so it would lay flat on the spacer and then pretty much just started stacking things on. The order is:
4.5 mm spacer
Cassette minus the three screws (1)
Thin spacer (2)
Sprocket (3)
Lock Ring(4)
It looks right to me, but I want to be sure before I apply 30 ft/lbs.
Bob
10-30-06, 10:41 AM
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I'm not sure the thin spacer is necessary - all of the sprockets should be equally distant from each other, and I've not seen Shimano or shimano-compatible cassettes that require a thin spacer between a loose sprocket and the group of sprockets.
The thin spacer is usually intended to go on the freehub before the sprockets, just to set the sprockets a little further outboard. It can be helpful if your rear derailler bumps into the spokes when shifting into the easiest gear, and used to be necessary to use a cassette with an 11t small sprocket on older freehub bodies that had been designed with a 12t smallest sprocket in mind.
The thin spacer is usually intended to go on the freehub before the sprockets, just to set the sprockets a little further outboard. It can be helpful if your rear derailler bumps into the spokes when shifting into the easiest gear, and used to be necessary to use a cassette with an 11t small sprocket on older freehub bodies that had been designed with a 12t smallest sprocket in mind.
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"c" is not a unit that measures tire width
"c" is not a unit that measures tire width
10-30-06, 12:04 PM
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Originally Posted by timcupery
I'm not sure the thin spacer is necessary - all of the sprockets should be equally distant from each other, and I've not seen Shimano or shimano-compatible cassettes that require a thin spacer between a loose sprocket and the group of sprockets.
The thin spacer is usually intended to go on the freehub before the sprockets, just to set the sprockets a little further outboard. It can be helpful if your rear derailler bumps into the spokes when shifting into the easiest gear, and used to be necessary to use a cassette with an 11t small sprocket on older freehub bodies that had been designed with a 12t smallest sprocket in mind.
The thin spacer is usually intended to go on the freehub before the sprockets, just to set the sprockets a little further outboard. It can be helpful if your rear derailler bumps into the spokes when shifting into the easiest gear, and used to be necessary to use a cassette with an 11t small sprocket on older freehub bodies that had been designed with a 12t smallest sprocket in mind.
In any case it will be obvious if you look at the cassette edge on...if you have it in the wrong place it will be immediately obvious that the spacing is non standard.
Sheldon "Really Not Difficult" Brown
10-30-06, 01:22 PM
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Originally Posted by Sheldon Brown
Actually, with most 7-speed cassettes, the thin spacer goes between the smallest sprocket and the next one, if memory serves.
In any case it will be obvious if you look at the cassette edge on...if you have it in the wrong place it will be immediately obvious that the spacing is non standard.
Sheldon "Really Not Difficult" Brown
In any case it will be obvious if you look at the cassette edge on...if you have it in the wrong place it will be immediately obvious that the spacing is non standard.
Sheldon "Really Not Difficult" Brown
Thanks for the info, Sheldon!
10-30-06, 03:06 PM
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that really thin spacer is notched with semi-circles all the way 'round. it is meant to go between the main part of the cassette and the first loose cog. on a lot of 7-speed cassettes, there are three pins that go through the main part that hold all the cogs and spacers together, and the semi-circles on the thin spacer are meant to fit around those pins. that thin spacer should be placed so that the cog has a flush surface to sit on, otherwise, when you tighten down the lockring, the first loose cog can flex a little bit between the gaps between pins. i think on some, if not all, of the newer 7 speed cassettes, the pins are flush with the outermost cog in that cluster, however you still need that spacer.
