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The C.B. Design Insert Wheel has many of the same great features as other C.B. Design Wheels; however, it has been designed to accept wheel inserts.  Machined wheels are generally available in a relatively small number of designs - one reason is many wheel designs do not lend themselves to accurate reproduction when machined (or the machining required is prohibitively expensive).  For these wheels designs, inserts may be available or can be created easily using old plastic wheels.  C.B. Design Insert Wheels offer the following features and benefits:

  • Precision machined using state-of-the-art CNC machine tools which ensure C.B. Design Insert Wheels are perfectly round and the axle bore is concentric with both the outer wheel surface and longitudinal axis of the axle.
  • Perfect concentricity between the axle bore and longitudinal axis of the axle is achieved by designing all C.B. Design Wheels for a specific axle ( SIPA01). Tolerances between the axle bore and axle are very snug. When mounting or dismounting C.B. Design Insert Wheels on the recommended axle, resistance will usually be noticeable. Again, this is by design - the snug fit ensures concentricity is maintained when the set screw is tightened. The result – ZERO wheel wobble or vibration which translates into better performance whether in a straight line or while cornering.
  • Accepts wheel inserts.  C.B. Design Insert Wheels will accept Slot.It inserts or you can create your own inserts by turning down old plastic wheels.
  • Sturdy, race proven design.  Some of our competitors wheel's achieve lighter weight at the expense of the durability.  Ultra-lightweight wheels can be prone to "bending" - particularly when subjected to "offs" and hits during actual racing.  Once bent, the wheel "wobbles" which in turn adversely affects the car's performance.  In contrast, C.B. Design Insert Wheels are designed to be raced under the most demanding conditions - rest assured they will survive crashes and trips to the floor!
  • True hubless design provides exceptional flexibility when adjusting the front and rear track width. This is particularly important when rules specify the wheel/tire must be completely inside the fender and/or a maximum track width.
  • Easy to locate the retaining set screw using a small dimple machined on the outside of wheel. This is especially helpful if the tire is glued to the wheel and you can’t easily peel the tire back to locate the set screw.
  • Affordable 

What Size Wheels Are Available?

C.B. Design Insert Wheels are currently available in the following sizes: 

  • 14x6mm, 14x7mm, 14x8mm
  • 15x7mm, 15x8mm, 15x10mm, 15x11mm, 15x12mm
  • 17x8mm, 17x10mm, 17x11mm

    Note:  More C.B. Design Insert Wheels are planned for the future.


Where Can I Find Inserts For These Wheels? 

We offer a wide selection of CG Slotcars wheel inserts designed specifically for C.B. Design Wheels.  For more information, please click the link below.

CG Slotcars Wheel Inserts


What Tires Fit These Wheels? 

We offer exclusive Tire Selectors for Quick Slicks (silicone) and Paul Gage (urethane) tires.  For more information, please click the link below.

Tire Selectors


Tips For Using C.B. Design Insert Wheels

To ensure the best possible performance and to prevent inadvertent damage to the axle and/or C.B. Design Insert Wheels, please review and follow these tips.

  • Use ONLY the recommended axle - (tm) part number SIPA01. As mentioned previously, C.B. Design Insert Wheels were designed specifically to fit this axle. Note that other manufacturers "3/32 inch" axles and drill blanks do NOT have the same EXACT outer diameter as the (tm) axle. As a result, these axles and/or drill blanks are either too small (loose fit = wobble/vibration/hopping) or too large (wheel will not fit - the wheel will be damaged if forced on).
  • Use a new axle. Used axles often have scratches and/or foreign material present on the outer surface which can prevent the C.B. Design Insert Wheels from fitting onto the axle properly (yes - the tolerances are that close...).
  • Ensure the inside face of the wheel is perpendicular to the axle before pushing the wheel onto the axle. When the axle is lined up properly with the C.B. Design Insert Wheels axle bore, minimal effort should be required to push the wheel onto the axle. A small but noticeable amount of resistance is normal - this "snug" fit is part of the C.B. Design Insert Wheels design. Never force the wheel onto the axle!
  • Even with precision machined parts, there will be some variation from one part to the next. This holds true for the recommended (tm) axles and C.B. Design Insert Wheels. Occasionally you may have an axle with a slightly larger than normal outer diameter and a C.B. Design Insert Wheel with a slightly smaller inner diameter (axle bore) - the result may be a very "snug" fit. When this occurs, slowly twisting the C.B. Design Insert Wheel as it is being pushed onto the axle will sometimes help. Again, don't force the wheel on the axle!
  • If a given C.B. Design Insert Wheel cannot be pushed onto the axle after following the tips above, try using another (new) axle if one is available.
  • Don't overtighten the retaining set screw! The set screw just needs to be snug - overtightening can strip the threads in the wheel. This tip applies to all aluminum "set screw" wheels - not just C.B. Design Insert Wheels.

Note:  Cars and other props shown with wheels are for illustrative purposes only (NOT included with wheel purchase)