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Can anyone explain to me how spacers work?

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Can anyone explain to me how spacers work?

Old 07-26-13, 06:54 PM
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Can anyone explain to me how spacers work?

So im buying Mavic Crossride UB Wheel Set

https://www.evanscycles.com/products/...025792#answers

Im going to buy a 7 speed cassette and im wondering what spacer will i need and how do i put it on?

It says that " 7 speed cassette will fit this wheel, but you will need a spacer as the 7 speed cassette is narrower than modern freehub bodies. "

What size spacer do i need to buy? can someone point me in the right direction

Please help thanks
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Old 07-26-13, 07:01 PM
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To run a 7 speed Shimano cassette on a Shimano 8/9/10 freehub, you need to have a 4.5mm spacer added behind the cassette, which will correct the space the cassette on the freehub, and enable to lock ring to be torqued down correctly (to 40Nm), some freehubs (Mavic included) required additional spacers, which are supplied with the wheel set.

For the 4.5mm spacer, it is not supplied with the cassette, a good LBS should carry these, either generic, Wheels Manufacturing, or Shimano.

Last edited by jimc101; 07-27-13 at 01:06 AM. Reason: 4.5mm spacer, not 3.5mm
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Old 07-26-13, 07:30 PM
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So im buying Mavic Crossride UB Wheel Set
WHY? Seems like miss applied spending to Me.

How about a new Bike instead.. ?


8 was added to 7.. same width between cogs.. so if No. 8 is not there you have to fill the space.

cassette body is made wide enough for 8..

you can also use the 8 speed cassette , just limit screw the RD to not use one on the edge.. to use just 7 of them.

Last edited by fietsbob; 07-27-13 at 11:09 AM.
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Old 07-26-13, 10:17 PM
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You need a 4.5mm spacer. (8 speed spacing is 4.8mm between cogs)

https://www.amazon.com/Wheels-Manufac.../dp/B001CJVLWO
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Old 07-27-13, 02:27 AM
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Originally Posted by fietsbob

you can also use the 8 speed cassette , just limit screw the RD to not use one on the edge.. to use just 7 of them.
I thought that the spacing between the chain and the cassette will be different? and even the crankset?
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Old 07-27-13, 08:56 AM
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If all the current hubs have 8 speed wide cassettes, one thing you cannot do is make the cassette narrower.

Generically 8 speed is 7+1... overlocknut width of hubs went from 126 to 130 to make width for the added cog ,
after that 9, 10, 11 were compacted into the width of the 8 speed .. remaining at 130

MTB stretched hubs to 135, that extra 5mm went on the left side , not the right.

same chains sell for 5,6,7,8, speed now.. 9, 10 and 11 all need their own unique chain width.
as intercog spaces have to be made thinner .. and the cogs them selves are a trifle thinner as well ..

Last edited by fietsbob; 07-27-13 at 09:02 AM.
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Old 07-27-13, 10:32 AM
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Originally Posted by jxpowers
I thought that the spacing between the chain and the cassette will be different? and even the crankset?
Cassette spacing IS different
7 speed spacing is 5.0mm
8 speed spacing is 4.8mm
Since you have 7 speed shifters-
6 shifts means you would be off 1.2mm over the entire "span" of the cassette.
You can "optimize" things by centering the chain in the middle cogs and only be off about 1/2 as much, but you'll probably have a noisy chain on the end cogs.
Get the spacer and do it right is the way I would go.
Just because something "works", doesn't mean it works well.

Now one option would be to upgrade straight to 9 speed.
New shifters (or at least the right shifter), chain & cassette and NO spacer.
An upgrade to 8 would only require the shifter & cassette, but I don't consider it cost feasible for just 1 more gear.
9 speed does tend to offer a much wider range of cassettes than 7 or 8.
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Old 07-27-13, 05:19 PM
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Originally Posted by fietsbob
WHY? Seems like miss applied spending to Me.

How about a new Bike instead.. ?
All im doing is upgrading, why would i spend even MORE money on a new bike when the one i have is already new?
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Old 07-28-13, 07:54 PM
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Originally Posted by jxpowers
All im doing is upgrading, why would i spend even MORE money on a new bike when the one i have is already new?
Don't. I recently upgraded an old MTB to a 7sp SRAM Pg-730. It originally came with a 6sp freewheel, but after upgrading to newer wheels I quickly learned the difference between freewheel and freehubs. In the pic below at the base of the cassette, you can see the 3 spacers 1.5mm each. They slipped right on, then the cassette goes on. Piece of cake really.
Attached Images
File Type: jpg
7sp cassette conversion.jpg (42.9 KB, 2 views)
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