The RC10B7.1D Team Kit is the dirt and clay version of Team Associated's two-wheel-drive 1/10 buggy kit, sold without motor, electronics or tires.
A 78T spur feeds the 2.6:1 laydown transmission and a ball differential, so your pinion decides the final drive. The chassis is 390 mm long with 12 mm hexes, and both ends run 30 wt shock oil. Divide a suggested final ratio by 2.6, then divide the 78T spur by that figure to find the pinion to try first.
The kind of vehicle the maker sells it as. It sets what the car is built to do and which cars it is fair to compare it with.
Buggies are low, light off-road cars built for jumps and fast corners on dirt, clay or turf tracks.
Drive
Only one axle is driven, the rear on almost every 2WD RC car.
It is lighter and simpler, and it takes more throttle control on loose ground.
Power
Sold without a motor, so you choose the motor, ESC and battery yourself.
Rows that depend on the motor say so.
Build
A kit you build yourself from parts.
Most kits come without motor, ESC, servo, radio and battery, and many without tires or a painted body.
The manual lists what to add.
Scale
The maker's nominal size compared with a full-size vehicle. It works more as a class label than a measurement.
A 1/10 monster truck is far bigger than a 1/10 touring car, so compare length and weight for real size.
This one is 390 mm long.
Part number
The maker's product number for this exact version.
A V2, a new color, or a kit instead of an RTR usually has a different number, and parts can differ between them.
Check it against your box or receipt before ordering parts.
Class
Buggy
Drive
2WD
Power
Motor not included
Build
Kit
Scale
1/10
Part number
90047
Drivetrain
Pinion
The small gear on the motor shaft. Fewer teeth gear the car shorter: quicker acceleration, lower top speed and a cooler motor. More teeth do the opposite.
On a chassis sold as kits, each kit brings its own.
Spur
The large gear the pinion drives. A bigger spur with the same pinion gears the car shorter.
Pinion and spur must have the same pitch, or tooth size, to mesh.
The Gearing parts table below shows this car's pitch and part numbers.
Transmission & axle
Every reduction after the spur, multiplied together: transmission, differentials and axle gears.
It is fixed by the design; the gearing you change is the pinion and spur.
Final drive
How many times the motor turns for one turn of the wheels. A higher number is shorter gearing: more acceleration and pulling power, less top speed.
Pinion
Not applicable
Spur
78TStock
Stock
Transmission & axle
2.60:1Stock
Stock
Final drive
Not applicable
Wheels & tires
Tire diameter
The outside diameter of the mounted tire, tread to tread. A taller tire covers more ground each turn, which gears the car taller.
Race tires wear down over a day, and a smaller tire gears the car shorter.
Wheel hex
The hex on the axle that the wheel locks onto and is driven by. A wheel must match the hex size to fit.
12 mm is the common size on 1/10 cars, so most 1/10 wheels fit; offset and width still vary.
The wheel nut is a separate size, so check its thread too before buying nuts.
Tire diameter
Not applicable
Wheel hex
12 mmStock
Stock
Suspension
Shock oil, front
The oil in the shocks slows how fast the suspension moves. Thicker oil settles the car more slowly and resists bottoming out; thinner oil lets the wheels follow bumps.
At the front it mostly shapes the steering: thicker oil makes the car turn in more calmly and dive less under braking; thinner oil turns in sharper and keeps the front tires on the ground over bumps.
Racers go thicker for big, smooth jumps and thinner for rough, choppy tracks.
It is graded in wt here. A wt number is the oil maker's own grade and differs between brands, so match the brand, or use the oil maker's chart to convert.
Shock oil, rear
The rear shocks mostly shape grip under power and how the car lands.
Thicker oil at the rear holds the back up on landings and keeps it steadier on the throttle; thinner oil lets it squat and follow rough or loose ground for more grip.
Front and rear run the same oil here (30 wt), so both ends respond alike. Changing one end at a time is the usual way to shift the balance.
Shock oil, front
30 wtStock
Stock
Shock oil, rear
30 wtStock
Stock
Power
Motor
Motor KV is the RPM a motor turns per volt with no load.
This vehicle comes without a motor, so there is no stock KV; it depends on the one you fit.
Motor shaft
The diameter of the motor's output shaft, which a pinion's bore must match.
This vehicle comes without a motor, so it depends on the one you fit.
Battery
The highest LiPo cell count the maker rates the electronics for.
This vehicle comes without electronics, so it depends on the ESC and motor you fit.
Motor
Not applicable
Motor shaft
Not applicable
Battery
Not applicable
Performance
Theoretical top speed
It needs a motor KV, and this vehicle comes without a motor. Fit one and the calculator works it out from the motor's KV and the gearing.
Theoretical top speed
Not applicable
Size & weight
Length
Overall length as the maker states it, usually with the body fitted.
Useful for comparing real size, since scale labels are loose.
Length
390 mm15.4 inStock
Stock
How to read these figures
Stock is as the vehicle ships.
Calculated is worked from the stock figures on this page rather than stored beside them, so the two cannot drift apart.
Not applicable means the vehicle does not come with it, like the motor on a roller or the tires on a race kit, or does not have one, like a KV rating on a brushed motor.
Tooth counts are the ones in the specifications above.
Pitch is given as metric module (Mod 1, Mod 0.8) or diametral pitch (32P, 48P). They are different standards and are not interchangeable, even where the numbers look close.
Bore is the pinion’s hole, listed separately from the motor shaft.
Linked part numbers go to the maker’s or official distributor’s page for that part.
The dirt and clay version of the RC10B7.1: Associated fits a ball differential, 81mm rear arms and 71mm CVA bones in place of the B7.1's gear diff, 78mm arms and 69mm bones, and keeps the same 3-gear laydown transmission.
The spec page prints an 'Internal Gear Ratio' of 2.60:1, and the manual installs the 78T 48P Octalock spur (#92295), with a 72T 48P spur (#92293) included for stock motors; its gear chart runs 20T to 33T pinions from 10.14:1 to 5.67:1, matching spur over pinion times 2.60.
Pinion, wheels and tires are not included, so there is no stock pinion or tire.
Sources
Every figure on this page traces to one of these; where they disagreed, the note above says which was used and why. Links open in a new tab.
