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  1. #1
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    largest cog possible for dura ace 8 spd?

    I need to put on a new cassette with lower gears for riding some steeper climbs in my area (mtns of NC). I'm dealing with an 8 spd Dura Ace STI shifter and deraileur likewise. My friend has used a 28t cog so I know (?) this will work even though DA is speced for 27 max. My question: Can I use an 8 spd Mtn Bike cassette? I like having 11-28 rather than say 13-28. Any essential difference between MTB and road cassettes? Please enlighten me. Thanks.
    jk

  2. #2
    Mr. Cellophane RainmanP's Avatar
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    JK,
    I am just a beginner at this stuff, but I did do some upgrades recently and researched things of this nature. I am also not familiar with Dura Ace 8-speed. However, the Dura Ace 9-speed is rated for 26 teeth max. But if your friend is using a 28, who knows. Would he let you borrow his cassette, just to put it on to make sure there is not something different about your setup that would make it unworkable? Just ride around the block to make sure it shifts reliably. As far as using a mtb cassette, my LBS told me that you can use pretty much any Shimano cassette - HG70 (105), Ultegra, Dura Ace, as well as the mtb cassettes - with any group as long as it's all for the same gearing (8-speed, 9-speed, etc.) and type - HG, IG. Same for derailleurs. In fact, I am using an XT rear der with my otherwise 105 group, 9-speed, STI, etc. Purrs like a kitten and gives me capacity up to 32 if I want to use it. If you look back through the old posts back around Feb or so, I asked here about using the XT rear der. One of the pros wrote that they set up road bikes all the time with XT for the very purpose of riding in the mountains.

    Nashbar.com has Deore XT rear der on sale for $40. I know it is a few steps down from your DA, but it will give you 34T capacity in case you do want to go to more than 28. You could just swap back to your DA when you don't need the capacity. Nashbar also has some HG 8-speed cassettes for $24.95, but the only choices in your chosen range are 13-26 and 11-30.

    Somebody correct me if I have gone astray here.
    Regards,
    Raymond
    If it ain't broke, mess with it anyway!

  3. #3
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    Thanks RM! Unfortunately aforementioned friend is 1000 miles to my west. However he says it will work and your post gives me some confidence to try it since it seems any cassette (mtn or road) will do. Performance has their own brand cassette and a SRAM cassette both of which are 8 sp. 11-28 in $25 range. And they don't specify mtn or road. ( I wouldn't try anything bigger for DA deraileur and I understand I could change to an XT der if I need some bigger cogs.) How are those Performance and SRAM cassettes? (Maybe one or two places make all cassettes for everyone!?)
    Thanks
    jk

  4. #4
    Mr. Cellophane RainmanP's Avatar
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    JK,
    SRAM is very well respected. Many mtb'rs here seem to like them better than Shimano. My attitude about Performance is that they seem to make decent stuff. I would probably stick with SRAM, all other things being equal.
    Regards,
    Raymond
    If it ain't broke, mess with it anyway!

  5. #5
    Mr. Cellophane RainmanP's Avatar
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    JK,
    SRAM is very well respected. Many mtb'rs here seem to like them better than Shimano. My attitude about Performance is that they seem to make decent stuff. Between the two, I would probably stick with SRAM, all other things being equal though I have never tried it. Someone else may have some advice here.
    Regards,
    Raymond
    If it ain't broke, mess with it anyway!

  6. #6
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    28 T is the biggest reccomened for a short cage derailleur.
    Xavier Cintron - www.bullteksports.com

  7. #7
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    Thanks for the info. Any problem going with an HG 70 or SRAM 11-28 with Dura Ace deraileur?
    jk639

  8. #8
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    Just put on an 11-28 SRAM and it shifted just fine with just a little adjustment of the front deraileur inside set screw. So I guess that settles that!

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