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  1. #1
    Collector of Useless Info
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    Denting Chainstays for Tire Clearance

    I have an old chrome-moly steel frame with high-ten chainstays-

    Can I dent the chainstays on the inside to get more tire clearance? What's a good way to go about doing this? Would a vice and a block with a channel gouged in it and a short piece of hardwood dowel work OK?

    Thanks for your assistance-

  2. #2
    Junior Member
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    That could work, or that could fail miserably, depending on your technique.

    Note that it may cause the dropouts to pull, so you may have to realign the back end.

  3. #3
    tuz
    tuz is online now
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    It can be done. Check the pics in that blog post.
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  4. #4
    my nice bike is at home kraftwerk's Avatar
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    Must be a more technical term for it. Good question tho...

  5. #5
    Old fart JohnDThompson's Avatar
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    It's easier before the frame is built (courtesy Richard Sachs Bicycles): http://www.flickr.com/photos/9866331...7600706475164/

  6. #6
    Senior Member ftwelder's Avatar
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    I have done it before plenty and it reeks much havoc. I have a device I made that is part of a motor press (mechanics press) that allows me to "reach around" the opposite chain stay. and apply pressure from the intended direction. It's rarely with the effort on anything but fat/round/straight stays. trying to crimp for chain ring will shorten the side the work was done and ruin the frame.
    1886 Surrey machinists Invincible, 1900 Nashua, 1937 Raleigh Golden Arrow, 1938 Raleigh Silver Record, 1951 Armstrong tourmalet, 1970 Motobecane Grand Record, 1971 Raleigh Professional, 1971 Gitane TDF, 1972 Legnano Gran Primio, 1973, Peugeot PX-10, 1975 Roberts, 1984 Battaglin Giro, 1985 Grandis Speciale, 2012 FTW

    frankthewelder@comcast.net

    le prix s'oublie,la qualité reste ,(michel audiard)

  7. #7
    Collector of Useless Info
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    Well, I did it... I used basically the method that Tuz suggested- a vise with a short little torpedo of steel. It worked a charm- it didn't even mar the paint, and added about a quarter inch of clearance to each side of the tires. It did make the chainstays pull together as Frank said it would, but I was planning on cold-setting the frame from 126 to 130 anyway- I just had to cold set it a little more.

    I don't think I'd try it if the chainstays were chrome-moly.

  8. #8
    Senior Member ftwelder's Avatar
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    Quote Originally Posted by cycle_maven View Post
    Well, I did it... I used basically the method that Tuz suggested- a vise with a short little torpedo of steel. It worked a charm- it didn't even mar the paint, and added about a quarter inch of clearance to each side of the tires. It did make the chainstays pull together as Frank said it would, but I was planning on cold-setting the frame from 126 to 130 anyway- I just had to cold set it a little more.

    I don't think I'd try it if the chainstays were chrome-moly.
    Frames with TIG welded bridges survive that treatment pretty well. Brazed joints, unless lugged don't like that type of load. Congrats!
    1886 Surrey machinists Invincible, 1900 Nashua, 1937 Raleigh Golden Arrow, 1938 Raleigh Silver Record, 1951 Armstrong tourmalet, 1970 Motobecane Grand Record, 1971 Raleigh Professional, 1971 Gitane TDF, 1972 Legnano Gran Primio, 1973, Peugeot PX-10, 1975 Roberts, 1984 Battaglin Giro, 1985 Grandis Speciale, 2012 FTW

    frankthewelder@comcast.net

    le prix s'oublie,la qualité reste ,(michel audiard)

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