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I could really could do with a hand here, I'm currently restoring a old Raleigh Milk Race bike which has friction tube shifters fitted. I want to upgrade the rear derailleur but I'm not sure if I have to buy a certain type. It has a SunRace one fitted, and the front one is a Shimano one.

The bike is a 7 speed.

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    What year is the bike? If memory serves the milk race ran from time immemorial until sometime around 2004, so you're looking at a wide range of different technologies to be compatible with. – Darth Egregious May 28 '13 at 18:07
  • If it's not indexed shift you basically just need a derailer with enough tooth capacity. IIRC, 7 speed of that era used a slightly narrower chain than 5/6, but not enough to upset the derailer. – Daniel R Hicks May 28 '13 at 21:55
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Almost any rear derailleur will do. You aren't limited by the shifters (since they're friction shifters, they have no index incompatabilities) and it's a 7 speed, so anything that is rated for 6, 7, or 8 speed will work fine. Go to a local shop that sells used parts or a local community group and take a look at what they have in their parts bin.

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