Hi all,

I'm after some help! I've recently built up an 80s Pinarello Asolo and it has a NOS Suntour 5 speed freewheel with a super tight ratio that has made hill climbs a little tough and I have a vintage race coming up next month with some decent hills. My (modern) KMC 7 speed chain has done less than 200 miles but had no problems with this freewheel.

The rules of the race state that there is a minimum spoke count so I have changed my wheels over and now have campag low flange hubs with an old Regina 5 speed freewheel and a much better ratio. However when I'm in a high gear (small cog) at the back the chain seems to slip every half a turn when push hard into the pedals or on a hill. I am told that this is common with a new chain and old freewheel so I have a ordered a NOS Everest 5 speed freewheel with the same threading. My question is, should I get an NOS vintage chain or is my nearly new modern KMC 7 speed chain likely to be ok?

Thanks in advance and have a good day!