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  1. #1
    Senior Member kevmk81's Avatar
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    Trainer roller has cuts in the metal

    I have an old Kurt kinetic fluid trainer. Basically the knob eventually stripped (just this morning in fact). I had to hacksaw the plastic knob off to get to the nut that was stuck on the bolt that it was attached to. In the process i dinged the roller the tire rides on. So, how do I get those grooves my hacksaw put into that metal out? What grit of paper should I use? Or, do I not need to do that at all? My concern is over time it will eat up my trainer tire.

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    It will eat up your tire.
    I also have a Kurt, and my advice would be to do it correctly. Disassemble and remove the roller first. If the hacks are pretty deep, you'll probably have to turn it on a lathe and polish for final finish. Sandpaper and other abrasives might work if the damage isn't too deep and you're careful, but you risk creating an uneven/out of round cylinder that'll ruin the spinning smoothness. Please post up close up pics of the damage so a more accurate assessment can be made and helpful advice given- a lot depends on existing condition.

  3. #3
    Senior Member Jakedatc's Avatar
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    ya.. if it isn't too deep a bit of emory paper (like sandpaper) will buff it out.
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    Remember, if you sand it it will not longer be round. And if the cuts are deep enough and you sand off too much it may give you a bumpy ride and put unneeded stress on your drop outs and wheel.
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  5. #5
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    Maybe it's time to contact the manufacturer for a replacement roller.
    Robert

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    There should be a threaded hole in the head of the bolt that holds the flywheel on. I don't know the size for sure, but it looks like a 6x1mm. Get a bolt that fits and thread it in there. Chuck your drill up on the head of that bolt (you likely don't have a drill that will chuck up on the flywheel bolt, but if you do, the small bolt step can be eliminated).

    Now, take some 120 grit sand paper and hold it to the roller while you are spinning it with the drill. Keep moving the paper back and forth across the entire roller. Use 120 until the grooves are gone. Now take some 320 and do the same thing to smooth out the scratches the 120 put in the roller. This will probably be plenty smooth, but I would go ahead and use 600 and smooth the roller further. Just keep going up in grit until you get a desired level of shine. After you get the grooves out, the rest of the polishing should not take long.

  7. #7
    Senior Member kevmk81's Avatar
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  8. #8
    Senior Member kevmk81's Avatar
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    I guess I could set it up to where the tire wouldn't touch that. I think it'd be possible. But a pita as much as I use it.

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    Those don't look that bad. They should easily polish out with a little time. It'll probably take you longer to find a bolt, sandpaper, and your drill than to polish it.

  10. #10
    Senior Member Jakedatc's Avatar
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    ya doesn't look that bad.. don't even worry about the few off to the side since they won't be near the tire. less is more.. don't really dig at it.. just smooth it down and don't make a divot

    and hindsight is 20/20 but whenever cutting something near paint or something you don't want scratched it's best to wrap it in a towel.
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    I'd adjust the parts that hold the axle so the tire misses that part of the roller. Alternatively, you could ride it that way and see if it does anything to the tire. The roads I ride are way rougher than those scratches look.

  12. #12
    Senior Member Homebrew01's Avatar
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    Very fine sandpaper. or an emery board for finger nails. Back & forth following the curvature, about 4 strokes and good-to-go.
    Just knock off any high spots. Don't try to remove the entire scratch.
    Last edited by Homebrew01; 01-25-15 at 11:33 AM.
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  13. #13
    Senior Member Homebrew01's Avatar
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    Quote Originally Posted by Team Sarcasm View Post
    Remember, if you sand it it will not longer be round. And if the cuts are deep enough and you sand off too much it may give you a bumpy ride and put unneeded stress on your drop outs and wheel.
    Then his frame will explode, causing his house to burn down.
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    I would leave them alone and suspect they won't have much impact on your tire. At the point of contact between the tire and roller there shouldn't be any movement if the roller pressure is correct. The only time it might be a problem would be if the wheel is slipping but that shouldn't be occurring. Aluminum is a soft metal and any potential sharp edges won't stay sharp in any case.

  15. #15
    Senior Member kevmk81's Avatar
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    Thanks everyone! Yeah, I realize I should have been more careful. I didn't think I could bugger it up that easily though. Plus, have to admit, it was early, and had to get to work, so I was getting a tad bit frustrated that it happened, and wasn't taking my time/being careful.

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    Quote Originally Posted by Homebrew01 View Post
    Then his frame will explode, causing his house to burn down.
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  17. #17
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    you may be able to fill them in with glue/locktite/etc. and then sand it down to a smooth surface.

    I imagined them to be bigger.
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  18. #18
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    J-B_Weld, trim with razor blade. No sanding. fix any raised burrs with a deburring knife or similar
    https://en.wikipedia.org/wiki/J-B_Weld

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    Pfft. If I had seen those pictures first, I would have advised differently- I pictured much worse as others did. No need to turn it, very minor damage, how did the sanding/polishing go? Would like to see an update picture.

  20. #20
    Senior Member kevmk81's Avatar
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    Decided not to do it since posting pictures most seemed to think it's not bad.

    Going to leave it be for now.

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