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  1. #1
    Junior Member
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    crankset choice and extra materials

    i have a trek pdx that i want to convert from a 24 to an 8 speed.

    http://www.trekbikes.com/us/en/bikes/urban/pdx/pdx/

    i have found a crank set that i think im going to buy and i thought i would put it up here to see what people thought.

    http://www.vueltausa.com/components/...set-black.html

    I am not very mechanically skilled yet so i have a few questions. will i need a new bottom bracket or any other drive train parts to make that crank work?

    will this crank require a new chain and if so will that chain work with my 8 speed cassette?

    Thank you for your input!

  2. #2
    Senior Member jeepr's Avatar
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    Your chain will work. That crank calls for a 108mm square taper bottom bracket. I'm sure you can find out what yours has somewhere on line. You will need a crank puller to remove your old crank.

  3. #3
    coprolite fietsbob's Avatar
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    A triple to a single means the Middle chainring remains,
    Its in the right chainline.

    consider just making the middle ring bigger ,
    and remove or ignore the inner and outer..

  4. #4
    Senior Member jeepr's Avatar
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    I have done that on a couple of bikes. I looked at his current crank and don't know if his chain rings are replaceable. There may be bolts under the chain guard.

  5. #5
    Bianchi Goddess Bianchigirll's Avatar
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    Quote Originally Posted by jeepr View Post
    I have done that on a couple of bikes. I looked at his current crank and don't know if his chain rings are replaceable. There may be bolts under the chain guard.
    I agree I have a feeling the rings are riveted together. I think when the OP orders the crankset he should just order the 108 BB, it is only $10
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

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