Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
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The rear is likely spaced for 135mm.
The tires that are intended for them (622-28/40) may be too large to fit in your frame.
You probably want to look for "road" wheels, not Hybrid.
Also check the spacing on the front. A lot of older bikes have <100mm spacing on the fork.
They DON'T spring well!
Some front hubs will have a 2-3MM spacer on each side that can be removed (and shorten the axle) to make them fit.