Kimbrough Products 48 Pitch slipper spur gears were developed for Associated B4, T4, B5, T5, B44, SC5 and SC10 vehicles. Kimbrough Racing Products Plastic Gears have been used to set all of the unlimited speed records for R/C 1/10 scale electric cars in the U.S., and are used by a majority of the top professional R/C car racers around the world. The best drivers in the world trust Kimbrough gears, so you know you can too!
Kimbrough spur gears are molded with black 4/6 Nylon plastic, because black dissipates heat into the air better then any other color - and high temperatures are not good for thermo-setting plastics. This plastic is almost three times tougher and will withstand operating temperatures 75° to 125° higher than plastics used by other R/C car gear manufacturers.
Kimbrough spur gears are full width, because a narrow or profiled plastic gear can deform under load, is weaker and less efficient. This can cause drag in the gear train and waste horsepower. The wider a gear is, the more load it can handle. The only time gear engineers narrow gears, is when there is a space limitation. Kimbrough Racing Products gears run quiet because they have the correct tooth shape and don't have to be narrowed. Choose from a variety of tooth count choices to allow you to fine tune the torque and top speed of your model.
NOTE: The use of full width pinion gears is highly recommended.
This product was added to our catalog on November 18, 2010
- Team Associated RC10 B4 Original
- Team Associated RC10 B4.1
- Team Associated RC10 B4.2
- Team Associated RC10 B44 Original
- Team Associated RC10 B44.1
- Team Associated RC10 B44.2
- Team Associated RC10 B44.3
- Team Associated RC10 B5 Original
- Team Associated RC10 B5M
- Team Associated RC10 SC5M
- Team Associated RC10 T4 Original
- Team Associated RC10 T4.1
- Team Associated RC10 T4.2
- Team Associated RC10 T5M
- Team Associated RC10 T6.1
- Team Associated RC10B6 Original
- Team Associated RC10B6.1
- Team Associated RC10B6.1D
- Team Associated RC10B6.2
- Team Associated RC10B6.2D
- Team Associated RC10B6D
- Team Associated SC10 Original
- Team Associated SC10.2
For me the only viable option was this gear which fits the gear case. The 88-89T may also fit with some trimming of the case. You can use the stock clutch slipper pads but you will need to file/sand smooth the mating surfaces as this has its own embossed slipper surface which is not compatible. It may be feasible to source a compatible slipper to avoid the mod.
You will need to drill the center shaft hole to accommodate the top shaft which is easy enough to do through plastic.
This gear allowed me to increase the stock FDR of 42.0 to 60.6 using the 14t (48p) pinion. To fit the pinion you may need to manage the clearance between the motor can and the gearbox.
At this time I could not find a plastic spur gear in the 32p 58T which would fit nicely. The 48p gears are more common in plastic and have more tooth count options. The 48p is also a lot quieter with proper meshing. With a month of use mainly for crawling on a light rig I haven't had any stripping and has held up nicely. Make sure your meshing is allowing the smallest of play to give you the best strip resistance.