Quick Q.
 

Trying to figure out what 700 tire is equivalent to a 27 1/4 tire. example is a 700x28 tire smaller/ thinner than a 27 1/4 thank you :)

700 X 35 by this list if you mean dia. 700 X 32 for width

http://www.bikecalc.com/wheel_size_math

27 1/4??? Do you mean 27 x 1 1/4?

And what do you mean by "equivalent"? You can't put a 700 tire on a 27" rim. Do you mean, what 700 rim/tire combination will give a similar ride to a 27" rim/tire combination? Then you probably just want a similar tire width. To convert from inches to millimeters, multiply by 25.4, so 1 1/4" -> 32 mm.

Rim stats, : 27" is 630, 700c is 622, that is the bead seat diameter
ETRO, a tire and rim makers agreement ...

All that you want to know about tire sizes can be found at the Oracle

Give a man a fish...... ;)

The number that you'll find helpful is that 1"=25.4mm

So.... 25.4x1.25= 31.75. a 32mm tire is closest to 1.25"

Also second/third that 700 and 27 are incompatible rim/tire sizes. a 700c rim will have a 622 bead diameter.