Cheap change to compact rings

Discussion in 'Cycling Equipment' started by pricera, Jan 6, 2006.

  1. pricera

    pricera New Member

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    I occasionally travel to/ride in a mountainous area (local area only has a fair amount of rolling terrain). I currently ride a Cannondale R4000si [CAAD 6] with a Cannondale Si Hollowgram crankset [39/53]. To date I have swapped out cogsets when planning for a climbing trip [to a 12-27]. My knees are weary of grinding a 39X27 @ 40rpm.

    Can anyone offer any suggestions on the cheapest way to swap out my 39/53 for a compact set, like a 34/50?

    Can I just swap out chainrings??

    Can anyone speak to what is compatible with the Cannondale Si Hollowgram bottom bracket [The CAAD6 has an oversized BB shell and axle]??

    Thanks all.
     
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  2. John M

    John M New Member

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    You cannot just swap chainrings as the bolt circle diameter of the regular crank is 130mm and the compact is 110mm. I cannot comment on the Hollowgram BB compatiblity.
     
  3. cycleski

    cycleski New Member

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    I made the change on my cannondale caad5 and relaced the BB as well as the crank set as the the compact crank uses a square taper in this case, english BB would be required for you. Ah, just noticed the oversize BB bit for caad6, good luck :(.
    http://www.probikekit.com/display.php?code=K1105
    Check Bontrager for 50/36 sets as an option. 2c
     
  4. pricera

    pricera New Member

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    Thanks for the replies - Cannondale wrote back as well: You would need a spider with a 110mm BCD. We do offer a SI Hollowgram Spider with the compact 110mm BCD; item number QC693.
    Thanks all and keep the rubber side down.
     
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