Can I put any rear derailleur on my old road bike with friction changers. I just got bike back from my dads. I've not ridden it for about 10 years but it had a new chain, new freewheel block (6 speed) not long before I stopped riding it. I now see that the reason I stopped riding it was the poor rear derailleur which I put on as temp measure when my brother wrecked original requiring the rear wheel to be rebuilt and I couldn't afford a better derailleur. That's a long way round saying. I want to put a new derailleur on it but only have friction changers. I know the indexed derailleur works in friction setting on my old Saracen is it the same with newer indexed changers. Are there any that I should avoid.