JConcepts 48P Associated "Silent Speed" Machined Spur Gear (81)

Read Reviews
4 (3)
Write a Review
JConcepts 48 Pitch Associated "Silent Speed" Machined Spur Gear. These gears are compatible with the Associated RC10 B4, T4, B44 SC10 and B5/T5/SC5 series vehicles, and are available in multiple tooth count options to fine tune torque and top speed. Silent Speed spur gears are precision machined making them uniquely concentric over standard or molded gears giving the user a consistent gear mesh allowing a more precise adjustment and more “silence” on the race track. The detailed machining provides a pattern vented area and secured slipper pad on both sides giving more consistent slipper performance. The gears are marked for size in 2 different ways so they are identifiable either assembled within a slipper assembly or as a stand-alone part. Silent Speed spur gears are also branded with the small JC logo for brand identification and authenticity.

Machined, recessed dots on the outer edge indicate size while assembled within the slipper assembly for easy identification:
  • 1 dot = 69 tooth
  • 2 dot = 72 tooth
  • 3 dot = 75 tooth
  • 4 dot = 78 tooth
  • 5 dot = 81 tooth
  • 6 dot = 84 tooth
  • 7 dot = 87 tooth
  • JConcepts simple design and function
  • Precision machined for durable and concentric design
  • Machined to indicate size while assembled or stand-alone
  • Fits Associated B4.1, T4.1, B44.1 and SC10 vehicles
  • JConcepts - World Proven Innovation and Design
Effects of Spur Gear Changes
 Gear  Effects
 Larger Spur
  • Increased acceleration
  • Decreased top speed
  • Use on smaller tracks for more punch
  • Use with larger pinion to get more overall torque, while maintaining the same gear ratio
 Smaller Spur
  • Decreases acceleration, but smoother
  • Increases top speed

This product was added to our catalog on October 24, 2011.

Monday, Dec 30 2013 (about 2 years ago)
JConcepts 48P Associated "Silent Speed" Machined Spur Gear (69)
These spur gears are great. As opposed to "just molded"(and out of round usually) gears these are concentric and easier to find proper mesh. They do not have pronounced high and low points of gear mesh providing best wear caracteristics. These cost more because of the extra cnc work; as each is machined seperately, but well worth it. Dont forget to keep them covered to prevent debris from ruining the investment. I personally like a wide(thicker than the spur), hardened aluminum pinion also.
Wesley Carroll
Verified Owner
Wednesday, Mar 20 2013 (about 3 years ago)
JConcepts 48P Associated "Silent Speed" Machined Spur Gear (81)
Best spur gear I've ever used. Makes setting the mesh super easy and consistent. Makes the car almost completely silent.
Ryan Hodges
Verified Owner
Monday, Jul 22 2013 (about 2 years ago)
JConcepts 48P Associated "Silent Speed" Machined Spur Gear (69)
Don't waste your money on this. There is no difference in sound vs. the AE one. Save the extra $4-$5 and buy something to eat instead.
$1.99 Flat Rate Shipping!
See Price In Cart
In Stock!
Only 2 left at this price!
This item is eligible for $1.99 flat rate shipping Learn More
This item earns up to 7 VIP Reward Points Learn More
Manufacturer Info
Browse other products from JConcepts