Cyclocross - Zac 19 rims - pinch flats with road tires?

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soybean
03-14-12, 03:33 PM
My friend has these Zac 19 rims - I guess they're cross rims. She was having issues with her old tire giving her flats as soon as she stuck it on (and a lot of difficulty putting it on). I thought it was just an old, messed up bead, so I put on a basic Michelin Dynamic 700 x 25c road tire, but the flats are happening still as I try to get it on.

Do I just need to bump up the width of the tire? Like go 700 x 28 or 30 or something?

Thanks!

Andy_K
03-14-12, 05:22 PM
It sounds more likely to be a rim tape issue to me.

A quick Google search suggests that the '19' in the name refers to the interior width, which would make 700x25 a little too narrow by the kind of conservative charts tire makers produce, but it's definitely not far enough out of scope to cause immediate failure upon mounting the tire.
soybean
03-16-12, 11:27 AM
I replaced the rim tape along with the tire and it still happened... but I used the weird stretchy Specialized rim tape, which I've never used before. Normally I use Fonde de Jante but for some reason in Quebec the two shops I went to both only had the Specialized.

ThermionicScott
03-16-12, 03:34 PM
What kind of flats? The type of rim shouldn't be a problem as long as the rim tape is good, the tire is installed and inflated properly.
Andy_K
03-16-12, 04:07 PM
There could be a spur along the inside of the sidewall somewhere. Try running a cotton ball along both sides.