Gotcha! I like it! Thanks for the tip. I'm off to find some small diamater steel tubing, maby some brake line at the parts store.
PS. Yes, I was thinking of the first example you have above in PVC.
Originally Posted by bomber1965
Both the bolt and anti-crush sleeve go clear through the bike rack tubing wall....and any amount of tighting the muffler to the rack will be stopped by the sleeve.
I also assumed the rack tubing wall thickness could be thin for weight savings and add in the abuse dirt bikes hand out, an anti-crush sleeve seemed appropriate.