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  1. #1
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    rear derailleur not right

    Peugeot PX10? / touring bike.

    SunTour / Cyclone Rear Derailleur / real wheel bolt came loose today when riding. Fun!!!

    How do I know if the Rear Derailleur is setup right? Concerned about going into a local bike shop with this 70's bicycle. Would like to get as much knowledge here and possibly fix it / Saving $$$.

    Note: when reversing the pedals, the chain comes off the top of the rear derailleur.

  2. #2
    Senior Member Retro Grouch's Avatar
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    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
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    Check your hanger alignment.

    1. Shift into a gear that makes the derailleur arm point straight down.
    2. Stand the bike up vertically against a wall or something.
    3. Look at the derailleur from the back. The arm should be parallel with the rear wheel.
    4. On a bike that old, I'd just bend it back with a big crescent wrench. Older bikes aren't as picky about hanger alignment as ones with 9 & 10 speed cassettes. If you decide to try that, be sure to leave the derailleur bolted in place so you don't ovalize the mounting hole in the hanger.

  3. #3
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    Removed the rear derailleur. Where it attaches to the bike, the derailleur seems bent at an angle. Will check Ebay for photos of what a rear derailleur should look like.

    Checked the bike frame where the wheels slide into the slots. Left side facing front of bike, the slot is ok "=", on the derailleur side, the slot is wide open: bolting the wheel there is no bottom metal to secure the nut. When the derailleur was there the nut would bolt onto that.

    Can I have the bike bent back correctly where the wheel slides into the frame?

  4. #4
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    Most likely this is a U08

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