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  1. #1
    The Legitimiser Sammyboy's Avatar
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    Sprocket sizes on an SRAM Spectro 7

    I've got an opportunity to buy an SRAM S7 for cheapish, and I've realised that if it'll run a 14t socket, it'd work well for my super-fast Moulton. Question is, will it? If not, I still need an SA8. Anyone know?

  2. #2
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    hey sammy, does this help out?

    http://www.sram-imotion.com/us/html/navigation_us.html
    ...::: POWERED BY SRAM :::...

    ooops doesn't say

  3. #3
    The Legitimiser Sammyboy's Avatar
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    No it doesn't does it? I know they take SA type sprockets, so I guess it'll come down to whether or not they need to be dished. With the clickbox on the outside, I would assume (and hope) not. I guess that the 130mm spacing might also give me problems though - that's a lot of spread on a little triangle....

  4. #4
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Hmm - I need to cast my mind back but recall that you can't go below a certain size as although the SA-style sprocket will still fit, there's a shoulder next the cog that means the chain won't sit in the teeth properly beyond a certain size.

    Mine came with a 14t I think or maybe a 15 - I liked it but thought the gearing a little low with my 52t chainwheel so went up one on the front and got a couple of smaller sprockets to try at the back. As I recall the 13t fit ok but the 12 didn't. This might be wrong though - it might have been that the 14 fit and the 13 didn't. I can check later on today as it still has the smallest one I could fit attached but it'll definitely take a 14 and maybe a 13 so that does answer your question...

    Great hubs - the clickbox less so if you need to take the wheel off a lot for punctures (as I did).
    h

  5. #5
    The Legitimiser Sammyboy's Avatar
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    Thanks Huw. I believe the cranks on my Moulton are 60T (they're definitely bigger than 52), which would mean with a 14t:

    60 / 14
    1.74 100.4
    17.6 %
    1.48 85.4
    19.4 %
    1.24 71.5
    24.0 %
    1.000 57.7
    23.5 %
    0.81 46.7
    19.1 %
    0.68 39.2
    19.3 %
    0.57 32.9

    Or 13T would be

    60 / 13
    1.74 108.1
    17.6 %
    1.48 91.9
    19.4 %
    1.24 77.0
    24.0 %
    1.000 62.1
    23.5 %
    0.81 50.3
    19.1 %
    0.68 42.2
    19.3 %
    0.57 35.4

    Both of those fit within my parameters, though really I'd still rather a higher top - I seldom shift as low as 35.4 on my other bikes, and especially not on fast roadies. However, the price may be the defining factor; I had this hub earmarked for my tandem, but now I have an Elan 12 for that (dipping my toe in VERY murky waters!). We shall see.

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