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  1. #1
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    single speed conversion

    I have a 2009 dimondback sorrento and im thinking about making it a single speed. I am just confused about the cranks.the large and small chainring are bolted onto the middle chainring. Do i need new cranks and chainrings? if so do i also need a new bb. what kind do i need? is this too expensive? trying to keep the price down because this is my secondary bike.
    "A day without sunshine is like, you know, night."
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  2. #2
    What could go wrong ...
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    just remove the large and small chainrings and you can use the chainring bolt spacers or get single chainring bolts to mount the middle chainring ... you shouldn't need to change your crankset
    I used to ride to Win ... Now I ride to Grin

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  3. #3
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    for best results get a single speed chain ring. Typical rings you see are 32t or 34t, with a 18t in the back.
    Big Foot Blue KHS XC704r

  4. #4
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    Here are some pics-
    the bolts are so flat i think i will have a hard time loosening them
    http://www.flickr.com/photos/[email protected]/4670718962/
    "A day without sunshine is like, you know, night."
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  5. #5
    What could go wrong ...
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    you need to use an allen/hex wrench to remove the chainring bolts ... unless they are riveted ... it looks like your big chainring is riveted (hard to tell by the pic) ... if that is the case you need change the crankset
    I used to ride to Win ... Now I ride to Grin

    While my guitar gently weeps, my bike sits there mocking me

  6. #6
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    Quote Originally Posted by Gsromich
    Here are some pics-
    the bolts are so flat i think i will have a hard time loosening them
    http://www.flickr.com/photos/[email protected]/4670718962/
    They look like rivets to me. If there not then you might need a chainring nut wrench. They tend to spin so you need the wrench to hold the nuts If they are in fact rivets then you will need a new crank.
    Big Foot Blue KHS XC704r

  7. #7
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    There all riveted. What do i do next?
    "A day without sunshine is like, you know, night."
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  8. #8
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    The other giveaway that they are riveted is that the small ring is obviously secured from the outside, but on bolted chain rings they are on the inside.
    Big Foot Blue KHS XC704r

  9. #9
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    Quote Originally Posted by Gsromich
    There all riveted. What do i do next?
    Buy a crank that has bolted on chain rings and put a SS ring on it, or buy a SS Crank. Probably buying the crank and adding the ring will be less than buying the SS crank. Dont forget a tensioner, SS chain ring bolts, SS Chain and the SS kit to replace the cassette.
    Big Foot Blue KHS XC704r

  10. #10
    What could go wrong ...
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    Quote Originally Posted by Dremer03
    Dont forget a tensioner, SS Chain
    most tensioners dont work well with SS chains ... just use a 8 speed chain and you will be fine
    I used to ride to Win ... Now I ride to Grin

    While my guitar gently weeps, my bike sits there mocking me

  11. #11
    AZ
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    Drill the rivets out , remove inner and outer chainrings . When you wear out the chainring , replace crankset .

  12. #12
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    Drill the rivets out , remove inner and outer chainrings . When you wear out the chainring , replace crankset .
    Yep. Hope you have some tools handy.
    Go SS and never go back.
    Raised in a Chicken-Coop by Chickens

  13. #13
    AZ
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    You can also carefully grind the rivets off .

  14. #14
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    Quote Originally Posted by Zoke2
    most tensioners dont work well with SS chains ... just use a 8 speed chain and you will be fine
    umm they do is you get the Sette one, or the Rennen one of the same design that is not spring loaded.

    Quote Originally Posted by AZ.MTNS
    Drill the rivets out , remove inner and outer chainrings . When you wear out the chainring , replace crankset .
    I didn't think it would be possible to replace the rivets with bolts.
    Big Foot Blue KHS XC704r

  15. #15
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    I didn't think it would be possible to replace the rivets with bolts.
    It looks like the middle chainring is attached to the crank and the small and big ring are riveted to the middle ring. It looks like no bolts are necessary.
    Raised in a Chicken-Coop by Chickens

  16. #16
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    could i take the crankset of my 10 garyfisher wahoo and put them one the diamondback? is it compatible with the BB? I can take the rings off those easily. then i could use that as an excuse to upgrade my crankset on my fisher
    "A day without sunshine is like, you know, night."
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  17. #17
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    Quote Originally Posted by Gsromich
    could i take the crankset of my 10 garyfisher wahoo and put them one the diamondback? is it compatible with the BB? I can take the rings off those easily. then i could use that as an excuse to upgrade my crankset on my fisher
    That's opening up a can of worms.

    There have been a bunch of sizing standards for bottom brackets over the years. If you have a crank puller, you could just take the left crank arm off both cranksets and see if the spindles match.

    But here's another idea. When you upgrade the crankset on your Fisher, get one with outboard bearings. They're more common and I think they're better. Then you'll have a spare bottom bracket to go with your spare crankset and if your Fisher's old crankset doesn't fit the bottom bracket on the DB, you can just chuck the crankset and bottom bracket from the DB and install the bottom bracket from the Fisher. Or replace it for about $30 - much easier to choose the right one when you've got a label in front of you.

    There's one last place to find a compatibility problem in all this. The bottom bracket shell widths may not match. I'd expect both to be 68mm, but there are some 73mm bottom bracket shells too. Just measure it and see.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  18. #18
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    when i measure, do i mesure the part that is frame, or do i measure the part the protrudes from the shell? they both seem like 73 with the sides protruding.
    "A day without sunshine is like, you know, night."
    Steve Martin

  19. #19
    Fat-tired Roadie
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    Just measure the frame.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  20. #20
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    agh.....too....much...thinking.....

    remove front derailleur
    remove rear derailleur
    remove both shifters
    keep all 3 rings (unless ya feel like drilling/dremeling your cranks)
    get ss kit (spacers/tensioner/cog)...or go ghetto with PVC and a cheapo shimano BMX cog
    eyeball chain alignment....it's gotta be pretty straight..not hard to do

    go ride you damn bike...it's fun...ghetto SS's are groovy tunes..

    when you become a badass....then go all custom blinged out...get some ugly tattoos of chicks riding bombs on your calves and drink cheap beer while you heckle your friends before a ride....

    then quote long forgotten 70's sitcom characters during the ascents....it helps humiliating the gearies on climbs.....
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  21. #21
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    i emailed garyfisher and they responded saying that my bike is a 73 mm bb and a square taper 123mm length spindle. i just have to figure out everything on the dimondback now.
    "A day without sunshine is like, you know, night."
    Steve Martin

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