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Mix and match cassettes?

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  • March 20, 2016 at 7:16 pm #25513
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    All the Shimano 8 speed cassettes start with 11 tooth which is too high for me.

    I’m looking to start with an 8 speed Alivio MTB cassette 11-32 and swap the first two cogs with a 13 and 14 from a 9 speed Sora road cassette.  I know the cogs and spacers on 9 speeds are slightly different thickness to 8 speed but I can get round that by using the 8 speed spacers with shims. I might not even need shims since it is just the last two cogs. EG

    Alivio CS-HG51-8:

    11, 13,15,18,21,24,28,32

    Sora CS-HG50-9:

    13,14,15…

    Is the 13 tooth Sora the same fit as the 11 tooth Alivio?

    Could I swap the 14 tooth Sora for the 13 tooth Alivio?

    Does an MTB freehub have the same splines as a road freehub?

    End result would be 13,14,15,18,21,24,28,32

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  • March 22, 2016 at 11:57 am #868733
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    horizontal dropout

    Thanks guys!

    Thanks guys!

    Rod I didn’t spot that cassette – it’s better gearing for me but it is a bit far down the quality heirarchy. I was looking at Alivio.

     

    Thanks for that link and info Woldsman. I need to find the corresponding MTB cassette doc.

     

    After I posted I discovered that the width of an 8speed sprocket plus spacer is the same as the width of a 9speed sprocket plus a 7 speed spacer. There might be some possibilities there.

    March 21, 2016 at 5:27 pm #868731
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    Woldsman

    Shimano do CS-HG50 Sora 8

    Shimano do CS-HG50 Sora 8 speed cassettes in both 13-23 and 13-26. 

     

    They are categorised as from either T-group or V-group depending on which cassette you buy.  In theory you are not supposed to mix groups (you could check which group your existing cassette belongs to and if it’s a T or V then choose the corresponding one). 

     

    In reality it makes no discernable difference IMHO (in the past I mixed and matched 9spd Tiagra/Deore cassettes).  In either of the above examples the first three sprockets appear identical (although you might want to check for yourself):

     

    http://www.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/CS/EV-CS-HG50-8-1858_v1_m56577569830608759.pdf

     

    Both cassettes are currently in stock at Chain Reaction Cycles, for example, for £11.49. 

     

    Best wishes – W.

    March 21, 2016 at 8:35 am #868729
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    Rod Marton

    I don’t know where you have

    I don’t know where you have been looking, but you can certainly find 8 speed Shimano cassettes starting with a 12 tooth sprocket. This might be suitable for you: http://www.sjscycles.co.uk/shimano-cs-hg200-8-speed-cassette-12-32t-prod36281/.

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