What is this spacer, with the raises pieces?
10-19-22, 03:09 PM
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What is this spacer, with the raises pieces?
I haven't seen this style cassette spacer before.
this was with a 7S cassette but why does it have these three raised pieces?
Does it work one way as 8S and the other way as 7S spacer?
this was with a 7S cassette but why does it have these three raised pieces?
Does it work one way as 8S and the other way as 7S spacer?
Last edited by pstock; 10-19-22 at 04:05 PM.
10-19-22, 03:23 PM
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A photo might help.
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10-19-22, 03:45 PM
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Totally agree!
I'm going to play psychic though, remembering when I bought my first new 7 speed cassette and wondering what the "weird" spacer was for.
The only one WITHOUT 3 bumps. (reverse psychic because one figures the OP missed there too)
IF it's a thin "serrated" one (maybe about .25mm? thick) I believe it's because the end cog is a 7 or 8 speed cog.
The spacer is omitted on 8 speed because or the narrower cog spacing.
I gotta look up an EV for a 7 speed cassette though to make sure I'm remembering right. Maybe it has 3 "bumps" to add thickness instead of making a new part#. It's hard to envision Shimano trying to limit part#'s though.
So much for playing psychic-
I'm going to play psychic though, remembering when I bought my first new 7 speed cassette and wondering what the "weird" spacer was for.
The only one WITHOUT 3 bumps. (reverse psychic because one figures the OP missed there too)
IF it's a thin "serrated" one (maybe about .25mm? thick) I believe it's because the end cog is a 7 or 8 speed cog.
The spacer is omitted on 8 speed because or the narrower cog spacing.
I gotta look up an EV for a 7 speed cassette though to make sure I'm remembering right. Maybe it has 3 "bumps" to add thickness instead of making a new part#. It's hard to envision Shimano trying to limit part#'s though.
So much for playing psychic-
Last edited by Bill Kapaun; 10-19-22 at 04:15 PM.
10-19-22, 03:51 PM
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This is just a guess but 7-speed cassettes often had the largest 4 or 5 cogs bolted together and what you are seeing is the bolt heads. They are not "spacers".
10-19-22, 04:05 PM
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sorry. I thought I had posted a photo. it didn't seem to upload. It is up now, in the first post, above
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10-19-22, 04:15 PM
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I finally found my calipers and the spacer measures 3.0mm (standard 8S Shimano) and the three flanges measure 4.0mm. so that is not 7S spacing.
they must just be to position the spacer. when positioned with the flangers pointing towards the centre of the hub, the do sit flush, in the right position. (flipped the other way they hold the next outside sprocket out a bit and space it too much.)
they must just be to position the spacer. when positioned with the flangers pointing towards the centre of the hub, the do sit flush, in the right position. (flipped the other way they hold the next outside sprocket out a bit and space it too much.)
10-19-22, 05:20 PM
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I thought 7sp and 8sp had the same spacing, but the move to 8sp required a wider freehub?
10-19-22, 06:57 PM
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No, 8 spd has a narrower cog C-C dimension by (IIRC) .2mm. Close enough to 7 spd dimensions to be thought is the same, but not quite. Now Campy 8 spd does use the same 5mm C-C as Shimano 7 does. Andy
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10-19-22, 08:03 PM
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Spacers with tabs that were wider than the spacer's normal width was used during the uniglide and early hyperglide days. See the diagrams for some of the Shimano freehubs, such as the FH-6400 or cassettes for CS-M732.
Since the tab in the same position that the long screw holding the cogs together, it would have to match a cog that didn't have a 'teeth' on the inside. Don't know about the spacer and cogs thickness from back in those years.
Since the tab in the same position that the long screw holding the cogs together, it would have to match a cog that didn't have a 'teeth' on the inside. Don't know about the spacer and cogs thickness from back in those years.
10-20-22, 09:21 AM
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10-20-22, 12:30 PM
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10-20-22, 12:41 PM
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Those little raised nubs fit into notches on cogs from that era. Yeah, I call em that.
Once you take the cassette apart, totally useless. I cut the nubs off, myself.
Once you take the cassette apart, totally useless. I cut the nubs off, myself.
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