Sorry - I meant a foam liner around the hydraulic hose in the downtube.
Some bikes seem to have them fitted to stop rattling.
Ah, dunno. Never seen that before. How do they put the foam liner in place if it's bigger than the brake hose and so won't fit through the entry hole?
Magnets.
This stuff.
@Brommers started
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Sorry - I meant a foam liner around the hydraulic hose in the downtube.
Some bikes seem to have them fitted to stop rattling.