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  1. #1
    Cool Guy Training.Wheels's Avatar
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    Any of my UK folks here have access to an SRAM Automatix 28h (not 36h)?

    I'm just wondering because I would really love one and would compensate you for your time if you helped mail me one. Looking forward to hearing responses. Thanks.
    http://www.pedalroom.com/member/J-Dogg

  2. #2
    tcs
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    Not sure where in the world you are but you should be able to order one direct from a commercial retailer. I went to www.google.de and searched for 'SRAM Automatix 28h'. I found half a dozen places that claimed to have it in stock in under a minute. Example.

    Disclaimer: I haven't done business with any of these folks.
    "When man first set woman on two wheels with a pair of pedals, did he know, I wonder, that he had rent the veil of the harem in twain? A woman on a bicycle has all the world before her where to choose; she can go where she will, no man hindering." The Typewriter Girl, 1899.

    "Every so often a bird gets up and flies some place it's drawn to. I don't suppose it could tell you why, but it does it anyway." Ian Hibell, 1934-2008

  3. #3
    Cool Guy Training.Wheels's Avatar
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    Thanks tcs! Exactly what I was looking for.
    http://www.pedalroom.com/member/J-Dogg

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    Senior Member kamtsa's Avatar
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    Just wonder, do you need a special version for small wheels? Otherwise it will shift up too early because of the higher wheel RPM.
    Happier than a camel on wednesday.

  5. #5
    Cool Guy Training.Wheels's Avatar
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    Quote Originally Posted by kamtsa View Post
    Just wonder, do you need a special version for small wheels? Otherwise it will shift up too early because of the higher wheel RPM.
    Yeah, the one on the link is made for 20" wheels. The one they sell in the US is for 26" wheels. I want the one built for smaller wheels, but I may just wait it off because I can't really justify paying $60 for shipping just to get this product.
    http://www.pedalroom.com/member/J-Dogg

  6. #6
    coprolite fietsbob's Avatar
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    lace up to the 36 hole, skip holes, when using 28 spokes.
    7 groups of 4 , vs 9.

  7. #7
    Roadmaster Snobbery Club bhtooefr's Avatar
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    Quote Originally Posted by fietsbob View Post
    lace up to the 36 hole, skip holes, when using 28 spokes.
    7 groups of 4 , vs 9.
    The thing is, the 36 hole for aftermarket applications has a different shift point set internally from the 28 hole for aftermarket applications.

    28 hole is set to upshift around 161.3 rear wheel RPM, 36 hole is set to upshift around 131.6 rear wheel RPM.

    (Calculated from http://www.bikeforums.net/showthread...1#post14518348)

    So, on 47-406 tires, you're shifting at 7.6 mph on a 36 hole, or 9.3 mph on a 28 hole stock.

    (Myself, if I do a folder based on the Automatix, I'd just use the 36 hole and mod the spring to shift at around 11.5-12.2 mph, based on my desired gearing and the fact that I spin.)
    2011 TerraTrike Path 8
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  8. #8
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    Quote Originally Posted by bhtooefr View Post
    The thing is, the 36 hole for aftermarket applications has a different shift point set internally from the 28 hole for aftermarket applications.

    28 hole is set to upshift around 161.3 rear wheel RPM, 36 hole is set to upshift around 131.6 rear wheel RPM.

    (Calculated from http://www.bikeforums.net/showthread...1#post14518348)

    So, on 47-406 tires, you're shifting at 7.6 mph on a 36 hole, or 9.3 mph on a 28 hole stock.

    (Myself, if I do a folder based on the Automatix, I'd just use the 36 hole and mod the spring to shift at around 11.5-12.2 mph, based on my desired gearing and the fact that I spin.)
    It's true but I think it's easy to adjust the shift point. Read more here http://mccraw.co.uk/sram-automatix-review/
    Anyway I bought the 28h on BMO (bike-mailorder.de) but they will ship it only on the 1st september

  9. #9
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    I have built two of these now a 36h one for my Moulton TSR2 in a 20" rim and a 28h one for my Brompton, 16" wheel. I have modified the 28h one to change at 10mph. The 36h one I got from a friend in the UK (I am UK based) and the 28h I ordered from Germany. Cost me 50 incl postage plus the rim and spokes of course but I already had those.

    This is the 28h one laced up and fitted on my Brompton.



    This is the 36h one before I laced it up. Note this 36h one for my TSR2 has the coaster brake option as well.



    Its a great little hub.

    Regards

    Jerry
    Last edited by jerrysimon; 08-27-12 at 05:32 AM.

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