Hi,

Your quite right. Specialized seem to specialise in very silly numbers on their tyres.
75psi min to 100 psi max are stupid numbers for a 47mm tyre. No way is 75 psi
the safe minimum, you can go way beyond half that and still be safe.
(perhaps a typo, the 42mm or the 47mm).

100psi in a 47mm tyre is ludicrous, and IMO downright dangerous.

The 28mm is the most incomphrehensible :

"

The Infinity is a long-wearing, incredibly durable tire that's ideally suited for commuting, trekking, and street use. The deep recessed tread provides excellent traction through water and debris, while the rounded profile ensures stable, predictable handling in corners.

• Casing: 30 TPI
• Bead: wire
• Compound: 70a
• Flat Protection: Flak Jacket
• 26" x 1.75; psi 50-100; approximate weight 850g
• 700 x 28; psi 115-125; approximate weight 620g
• 700 x 32; psi 75-100; approximate weight 670g
• 700 x 35; psi 75-100; approximate weight 700g
• 700 x 38; psi 75-100; approximate weight 740g
• 700 x 42; psi 50-100; approximate weight 770g
• 700 x 47; psi 75-100; approximate weight 810g

"

115 psi to 125 psi for a 28mm tyre ? Everybody weighs very nearly the same ?
You can't go past 9% front and rear pressure difference ? utterly inane ....

Remember these are not road tyres, they are city tyres, 28mm typically about 75 psi.

Schwalbe put sensible pressures on their tyres, sensible minimum, sensible maximum.
You can see from the construction they describe how the various tyres vary somewhat.

I've no idea where Speciaized get their numbers from, but the recommended minimums
are way off anything to do with safety issues, and are silly high for all their tyres.
They seem to be pandering to the big psi numbers = quality utterly total myth.

rgds, sreten.