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@gbj_tester
Vittoria 111.2LT.F2.25.222BX is their 25-28 latex tube, not widely available but you should be able to find it*. Anecdote points to better results from using the larger tube (fewer pctrs, no penalty in rolling resistance) rather than stretching the small tube to the big tyre. This intuitively makes sense, since the tube is less stressed and therefore has more spare stretch available before rupture in the case of a penetration.
*http://www.wiggle.co.uk/vittoria-latex-inner-tube/ but they are saying May delivery for the 25/28