# Cassette Expander on 9 speed?

buddy_club
Posts:

**935**
Evening,

Is it possible to run a cassette expander on a nine speed cassette with a narrow wide up front? It's for my voodoo - I can't see any reason why not?

Cheers

Ben

Is it possible to run a cassette expander on a nine speed cassette with a narrow wide up front? It's for my voodoo - I can't see any reason why not?

Cheers

Ben

Framebuilder

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## Posts

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1,407No, he doesn't (well, he does as an aside, but no-one dignifies it with an answer because it isn't possible).

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27,8111/ 9 speed mechs are different to 10 and may not clear the bigger ring

2/ you will need have to find out for yourself how to make up a working rest of cassette and you may need a very slim spacer to get the correct 9 speed gap between gears versus the thinner 10 speed gap the expander is engineered to provide

3/ as the biggest 9 speed sprocket is 34 and not 36 you'll have a bigger gap between gears

You could fix some of that by buying a basic dismantle-able cassette in both 9 and 10 speed and matching up the gears you want to make the cassette you want but it wil be heavier.

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Parkwood:http://goo.gl/Gf8xkL

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Parkwood:http://goo.gl/Gf8xkL

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935Maximum Sprocket 36T

Minimum Sprocket 11T

Front Difference 22T

Total Capacity 45T

Is it the max sprocket (36t) that means I won't be able to fit an expander or is it total capacity (45t) which it seems I would get away with it?

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1,407935Handbuilt Steel 29er https://goo.gl/RYSbaa

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50,675Lives HereParktools :?:SheldonBrown

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Parkwood:http://goo.gl/Gf8xkL

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Triban:http://goo.gl/v63FBB

95127,81195127,81114,7749358 Spd: 3.00mm

9 Spd: 2.56mm

10 Spd: 2.35mm (1.0mm for lower spacer)

Would it be different widths with SRAM?

From here by the way:

http://bicycles.stackexchange.com/questions/17064/what-are-the-widths-of-shimano-8-9-and-10-speed-cassettes

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27,811As its 0.2mm I think I'd be inclined not to bother with trying to make a spacer and see if it works without.

1,407That doesn't apply to MTB - 10 speed ROAD cassettes need a spacer on a 9-speed freehub, but 10-speed MTB cassettes don't - they're the same total width.

As I stated in the other thread (linked to on page one), the difference in total cassette width caused by swapping a single sprocket (and associated spacer, if applicable) from 9 speed to 10 speed is about 1%, or 0.38mm. Personally, I'd be hugely surprised if this tiny difference meant that the lock-ring couldn't hold the cassette in place properly.

27,8119519,61327,81181227,811523Found this, may be helpful on your attempt :!:

― Kurt Vonnegut