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  1. #1
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    Novice needs advice on Conversion to single speed

    Hello All~ I have aquired a Mongoose paver 700c 28inch wheels, 7 speed, aluminum body with verticle dropouts that was abandoned by my brother 3-4 years ago. It had been damaged (ran over a car i think) which left the rear rim ruined but the frame appears to my eye to be undamaged. I want to order a new rear wheel and convert to a single speed. It has a 36 tooth sprocket. The chain is very rusty as the bike has been exposed to weather during this time. I need advice on what type wheel/axle and/or conversion kit to purchase to safely and economically get this bike going (target budget around $75 if possible). Any other related advice on what I might need to check, lube,ect before riding would be appreciated . Thanks. Jeff

  2. #2
    Senior Member seau grateau's Avatar
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    Check the frame thoroughly for structural damage. Given that the bike has apparently been run over, you're not unlikely to find problems. If it's all sound, then you can start thinking about whether this is actually worth it.
    Quote Originally Posted by adriano View Post
    thanckx.
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    "I made love to your mother dozens of times last week, and she doesnt know what a worn chain ring looks like"

  3. #3
    Senior Member Retro Grouch's Avatar
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    The nice thing about a project like this is, until you start fixing it, you can't lose any money on the deal.

    Two questions:
    1. Is the frame the right size for you?
    2. Is the frame straight? Run a straight edge from the head tube to the rear dropouts on both sides and measure to the seat tube. If it's not the same on both sides, it's recycle bin fodder.

    Honestly, vertical dropouts would make it a no go for me. There's ways around that but they're not elegant.
    My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.

  4. #4
    Grumpy Old Bugga europa's Avatar
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    Quote Originally Posted by Retro Grouch View Post
    The nice thing about a project like this is, until you start fixing it, you can't lose any money on the deal.

    Two questions:
    1. Is the frame the right size for you?
    2. Is the frame straight? Run a straight edge from the head tube to the rear dropouts on both sides and measure to the seat tube. If it's not the same on both sides, it's recycle bin fodder.

    Honestly, vertical dropouts would make it a no go for me. There's ways around that but they're not elegant.
    SS is fine because he can just clean up the existing rear derailleur to use as a chain tensioner. Fixed gear is a different issue.

    The other points are critical though.
    If the frame doesn't fit, don't even bother starting.
    If the frame isn't straight, don't even bother starting - Sheldon Brown has some info on checking it all.
    I had a good bike ... so I FIXED it

  5. #5
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    I'm not sure of the frame size. I am 5'6" and 185 lbs. I am going to check the alignment with a straight edge as Retro Grouch suggested. Can a rusty chain be renewed with a few days in a oil bath or is it trashed if it is covered in rust?

  6. #6
    Must... ride... more... Phil_gretz's Avatar
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    Quote Originally Posted by jmatsc View Post
    I'm not sure of the frame size. I am 5'6" and 185 lbs. I am going to check the alignment with a straight edge as Retro Grouch suggested.
    String method...check Sheldon's site.


    Quote Originally Posted by jmatsc View Post
    Can a rusty chain be renewed with a few days in a oil bath or is it trashed if it is covered in rust?
    Why? Get a new chain, as you'll likely be buying a chainring as well as rear freewheel and tensioner. $75? I'd like to see how you'd allocate that budget.

    Wheel
    Freewheel
    Chain
    Tensioner
    Chainring
    Brake Pads
    Brake Cables

  7. #7
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    Sorry to be harsh but that was a $100+ commuterish bike when new:

    Customer Reviews for Mongoose Paver 700C Men's Bike - Walmart.com

    Even if the frame is straight, why would you consider wasting
    target budget around $75 if possible
    to rebuild/convert it? Which BTW is impossibly low.

    Save your money a bit longer - good luck...
    Last edited by IAmSam; 04-14-14 at 03:47 PM.

  8. #8
    pro in someone's theory prooftheory's Avatar
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    I know exactly what OP is thinking. He's thinking "Here is a hunk of metal that is destined to be landfill but if I just knew what I was doing I could make something cool out of it for almost know money and I'd be totally saving the earth." I wish it worked that way. I hate seeing trashed up box-store bikes that are completely wasteful. Unfortunately, the only real way to contribute in this respect is by not buying a box store bike. It will be better if it ends up as scrap. Sad.

  9. #9
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    I guess you guys are right, which is what i was afraid of from the beginning. My Trex was stolen a while back and this freebie turned up as a option to have something to ride. My budget is extremely tight right now and i was hoping that someone could point me in the right direction as I have no real maintainence/repair experience. It appears that any money will be ill spent on this bike and I should just try to save up for a new inexpensive ride. I thank all for their input.

  10. #10
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    Quote Originally Posted by jmatsc View Post
    I guess you guys are right, which is what i was afraid of from the beginning. My Trex was stolen a while back and this freebie turned up as a option to have something to ride. My budget is extremely tight right now and i was hoping that someone could point me in the right direction as I have no real maintainence/repair experience. It appears that any money will be ill spent on this bike and I should just try to save up for a new inexpensive ride. I thank all for their input.
    If you can find some one who knows enough to help you cobble it together, you could probably get it ridable at a bike co-op/bike kitchen sort of place using other old used parts. It will still be a crappy bike, but should move you from place to place as needed. Don't put any real money into it. It much cheaper in the long run to get a complete bike that works from the start (either new or used).

    This is assuming the frame is not damaged.

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