Kadee #520 HO Scale, 33" Diameter Smooth Back Metal Code 110 Wheels, Freight and Passenger

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#520 - 33" Diameter Smooth Back Wheelsets (Code 110) - HO Scale

Smooth wheelsets are most commonly found on diesel era rolling stock. Kadee® wheel sets are manufactured to the most exacting standards and feature: RP-25 contour, non-magnetic metal wheels and insulated needlepoint axles.

#520 Instructions (pdf)

Truck & Wheel Handout (pdf)

Twelve Sets
(1 Set = 1 Axle)

Axle Tip to Tip: 1.018"


Wheelset Features:

  • Code 110 (.110") 33" Smooth Back Wheels
  • Accurate markings
  • Incredible detail true to prototype
  • Non-magnetic Metal Wheels
  • Smooth tracking Free rolling Contoured Insulated Axles
  • RP-25 Free rolling wheels
  • Needlepoint Axles
  • Axle Tip to Tip: 1.018"
  • Freight & Passenger

Package Includes:

  • (12) Sets #520 33" Diameter Smooth Back Wheelsets (Code 110)


The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.

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