28mm tyres on 20mm (internal) width rims?

[EasyPeez]

Tyres being -
https://www.vittoria.com/eu/catalog/product/view/id/2211/s/corsa-control-15450/category/306/

Rims being Pacenti SL25s

I know Sheldon would say it's wrong, but is it wrong enough to cause concern?

 

[Milkfloat]

I would not worry at all, Sheldon always seems very conservative.

 

[StuAff]

I'd agree. Hunt say for their 4 Season Gravel Discs (of identical internal width) 25-50mm tyre widths. As for the SL25, found this on Peloton magazine's site, referring to Kirk Pacenti himself:

"There are standards set out by a European organization, ETRTO, for tire and rim mating and according to its chart no tire smaller than a 28mm should be used on a rim with this internal width. While we have not ridden the rim with a 25mm tire we would happily do so, in our experience the standards are incredibly conservative as they likely know people will always push the envelope. Kirk himself suggests a 25mm tire for pure road riding with the SL25 and reports even 23mm tires have been run with no issues on the rim."
https://pelotonmagazine.com/gear/pacenti-sl25goldilocks-width/

 

[EasyPeez]

Brilliant, thanks both for your excellent help :-)