-
It shouldn’t scratch at all, if the nylon sleeve in the seat tube is in good shape. Grit and shit gets onto the post and tends to get drawn into the sleeve in normal use, which is why it’s important to keep the post clean and the clamp tension at the correct setting.
To be honest the best seat post is the stock Brompton chromed one. I had plans to tart mine up, until I realised that it’s a practical bike and it’s just better off as standard. Unless you throw shitloads of cash at it you’re just shaving a few grams off here and there.
Having said that, if I sold one of my Moto Guzzis I would buy a ti main frame, fork and rear triangle and really go for it. There’s a place in the US that makes a full carbon steerer, only £1700...
How will this not get completely scratched to fuck in about 5 minutes of use?
My ti seatpost has plenty of wear marks, I can't see a rainbow anodised seatpost becoming anything more than a mess of patchy colours in a month or two.