You can use 20mm, the perlon won't care as it's flexible. At least that's what I do.
Good to know- and it doesn't bunch up too much around the lugs?
Ah just checked, it's actually a 18mm one so does definitely not bunch on 19mm. The chunky nato that was also labeled as 18 does bunch a lot.
@chrismanc 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.
You can use 20mm, the perlon won't care as it's flexible.
At least that's what I do.