Originally Posted by
govambam
what if i put on a new wheel with a 10 speed casstte? will my seven speed down tube shifting work for the time being with just three blank shifts if i adjust my deraileur stops correctly?
No.
10sp spacing is much narrower. It will work if your DT shifter has a friction mode, however. But the narrower chain may not work with your chainrings.
The 8/9/10 speed hub is wider than your 7sp. You'll need to flex the frame out to get the wheel into the dropouts.
Here's an article about frame spacing.