I have spaced out a bottom bracket today due to the same problem you are having.
In my case due to the age of the bike, type of front derailleur I knew I would have to do this.
For info I used the delrin spacers from an old cassette. Ended up using rwo to move the chainrings out by about 5mm.
@freezing77 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I have spaced out a bottom bracket today due to the same problem you are having.
In my case due to the age of the bike, type of front derailleur I knew I would have to do this.
For info I used the delrin spacers from an old cassette. Ended up using rwo to move the chainrings out by about 5mm.