Join Date: Oct 2016
Location: Wiener Neudorf, Austria
I've got the infos from 2 different sources (my tire supplier and my local Honda dealer too) and, no I don't have statistics and/or data for.
Further, as written it's "not recommended" but, not forbidden.
I run a HD tube at the front by my on AT at the moment (when changing the tire I only have this type handy).
Never the less it sounds logical to me: Heavier bike => more tire movement = stiffer tube (HD or UHD) isn't as flexible as a normal one => more movement between tire and tube => more heat produced. Once again, especially on highway use it sounds logical to me. More and/or only off road use I guess it could make sense to go for HD/UHD (I think it's somehow similar as when using a Mousse on Enduro bikes => road speed = heat which kills the Mousse quickly ).
Also do not forget the HD/UHD tubes have more weight => more rotating mass.