Honda 2005 VTX1800C Owner's Manual page 249

Quick Reference
Tires
Tire Pressure
(cold)
Spark Plugs
Fuses
Final Drive Oil
Quick Reference
130/70R18M/C 63V
Front:
130/70R18M/C 63H
DUNLOP D251F
180/55R18M/C 74V
Rear:
180/70R16M/C 77H
DUNLOP D251
Type: radial-ply, tubeless
Front: 33 psi (225 kPa , 2.25 kgf/cm )
Rear: 42 psi (290 kPa , 2.90 kgf/cm )
33 psi (225 kPa , 2.25 kgf/cm )
with less than 200 lbs (90 kg) of added weight
42 psi (290 kPa , 2.90 kgf/cm )
36 psi (250 kPa , 2.50 kgf/cm )
with more than 200 lbs (90 kg) of added weight
IFR5L11 (NGK)
standard:
IFR6L11 (NGK)
high speed riding:
main A:
30A
main B:
30A
other:
5A , 10A , 20A
Hypoid Gear Oil SAE 80
...VTX1800F
...VTX1800C
...VTX1800F
...VTX1800C
...VTX1800F
...VTX1800C
...VTX1800F
...VTX1800C
or VK16PRZ11 (DENSO)
or VK20PRZ11 (DENSO)