Restomod

Freewheel 

Shimano HG road

• 12s road cassette
• a spacer ring (1.85 mm) is required for an MTB cassette
  • 8,9,10,11s MTB cassette, with the spacer
    

Crankset

• for 1x (single chainring) setups use Wide-Narrow or similar technology

Chainline

• old 90s MTB typically have 47.5 (7s) or 49mm (8s+) chainline
  • for 1x (single chainring) setups: The target chainline is often around 49mm for a 135mm hub
• modern Deore or CUES have 52mm chainline, might not be the best match
  • Shimano CUES FC-U6000 9/10/11-fach Kurbel 40 Zähne has 50mm chainline

Q-Factor

•     the lateral distance between the outer faces of the two crank arms where the pedals attach