6 speed freewheel

On old 144mm BCD Record it's 41T minimum.

To the OP a 28T cog with a Super record rear mech didn't work for me. The top jockey wheel crashed into the cog as it shifted onto it and I didn't fancy risking damage to the rear mech. I know others say they run the combination OK but no amount of chain length alteration and moving the wheel to different positions in the dropouts got it working smoothly.

Mark.

I have just looked on the Campoldy website as I am looking for a better geared 6 speed Suntour and noticed they are in Wimborne which is just round the corner from me

So mark what size did you manage to run then?

24 worked well, 26 might just work but will probably mean shortening the chain so much there are only 3 usable gears on the big ring. In the end I ditched the Campag chainset (52/42) and fitted a Suntour Superbe Pro with a 130mm BCD so I could run a 38T inner ring.

Mark.

I have a bike with old 144 record and run a 14-28 freewheel on a nuovo record rear mech with no problems, weird stuff...

Thanks fellas I will just have to try various combinations
Cheers

Did you sort out a 6 speed freewheel?

I have one at home that appears unused and is surplus to requirements.

I was able to run a 14-28 with a NR rear mech if I ran it with a single 42t chain ring. If I introduced a double so it was 42/52 and a longer chain, the jockey wheel clashed wih the 28 cog.