Originally Posted by
Singlespd
Found some!! They are the Panasonic Panaracer Pasela PT. I found them with gum walls in 700x28c and they have a pressure rating of 105psi. They were cheap too..
This is sort of a semantic argument, but those tires aren't gumwalls!
Call them tan-side or skin-side, but gumwalls have thick rubber protecting the sidewalls from extended periods of exposure as well as from abrasion. Gumwalls usually are a feature only on cheaper tires where weight is not the primary concern of the customer.
The skin-side tires are more for enthusiasts, who A) put on the miles, thus wearing out the tread before the sidewalls are compromised, and who B) are conciencious about their bike's handling and storage, to thus preclude, again, compromising the sidewalls.
That the gumwalls are generally cheaper jibes well with a typical commuter bike that may be left locked up outside, also subject to the theft of any premium components if not of the entire bike.
As for rated max pressures, this is typically a very conservative number, but is appropriate in that the effect of age lowers the reliability of the casing. Thus a young tire can safely be ridden at higher pressure than a tire with significant aging, perhaps higher than as rated, and as these Paselas are particularly prone to the effects of aging when kept in service for longer periods.