Measured the channel in a cpl wheels and got 10-12mm due to the curved sides of the channels so maybe a cpl more mm on ea side would b ok as it would settle into the channel so 16mm sounds acceptable. I found one last roll of the wide that I would have to trim and it measured 22mm. - after reading more above I’ll wait to see the 16 when it arrives but thinking I’ll get some narrower 13 stuff as well - just measured what I trimmed off the last roll at 6mm so 6 from 22 = 16 so I guess I’ll be all set when the order arrives oops sorry!