Tire pressure may be a factor too.
The slicks on MY MTB are 26 X1.25 and 100psi as compared to my hybrid's 700 X 35 tires rated at 60psi.
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My nice new Nashbar Touring Build AKA "The Flying Avocadooooooooo!"
1998(?) Trek 700 Multitrack
1995 Trek 1220 AKA "Jimi"
Older Non-suspension Specialized Hardrock