Hi All - I'm going to be re-habbing a Triumph-branded bike that seems to be essentially a Raleigh Record. The rear derailleur is an Huret Allvit, and from what I've been reading, these aren't great.

I'm looking for suggestions for what to replace it with. Preferably, I'd be able to keep the same shifters and cassette.

Specific model names would be greatly appreciated.

Thanks!