Been running my recommissioned 1994 bike for 2 years now and been very happy.

Took it to the 3 Sisters track evening last week, which is good value pay as you go for 10min sessions (if it rains keep the session tokens for next time)

It’s a very tight small track and no real need to get out of 3rd, so for the next time I am looking to change sprockets to get better acceleration and +2 on the back would seem about right to a 40 tooth.

However I don’t think the standard 102 link chain will take a bigger sprocket so guessing down 1 on the front is the way to go, 15 down to a 14.

Does this sound like a reasonable plan?, any feedback appreciated.

I run 14/41 on my nc35 race bike, but I cant tell you how long my chain is.

I should imagine a 400 is about right for three sisters, not been for a very long time though.