Thanks Jipe
I came across your previous messages in the thread and also think that 53-39 should suite better and will give me 395% range with my 10s 11-32 cassette. I just checked gear calculator and 39 will give me 1.75m on 32t cog which I think is pretty close to the Rohloff low range of 1.5 ish and definitely lower than my lowest Brompton at 2.33. So climbing hills should be fine. Also 53t will somewhat improve high range too as it will be 6.94m which almost matches my 6 soeed Brompton at 7.05m. Do you think using 53t might cause any shifting issues or rubbing? I think 1t difference on chainring shouldn’t be an issue.

Do you think Shimano 53/39 chainrings will fit on my slider or I have to change cranks too? If yes which Shimano chainring model? Should I also change bottom bracket? Derailleur and derailleur adaptor are pretty clear now.