Yokomo's Master Speed MS2.0 is a 1/10 electric touring car kit, built on graphite, aluminium or steel chassis plates and sold without motor, electronics, tires or a pinion.
A 90T spur works through a 2:1 belt reduction, so the final drive is 90 divided by your pinion, times 2. The rear gear diff is filled with 7.5K oil from the kit. Pick a pinion that suits your motor class, then enter it in the gearing tool to see the speed it gives.
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.
Touring cars are 4WD on-road cars for asphalt and carpet tracks, often raced in classes with fixed motor and battery rules.
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.
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
Touring
Power
Motor not included
Build
Kit
Scale
1/10
Part number
MSR-020
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.
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.
On-road racers often compare gearing by rollout instead, because tire sizes differ between cars.
Diff oil, rear
Silicone oil sealed inside the differential. A diff lets the wheels on one axle turn at different speeds in a corner; thicker oil makes it act more like a solid axle.
At the rear, thicker oil puts power down more evenly on loose or slippery ground; thinner oil lets the car rotate more easily through a corner.
It is graded in cSt (centistokes), a measure of thickness that is the same across brands.
Pinion
Not applicable
Spur
90TStock
Stock
Transmission & axle
2.00:1Stock
Stock
Final drive
Not applicable
Diff oil, rear
7,500 cStStock
Stock
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.
Tire diameter
Not applicable
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
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.
Sold with a graphite (MSR-020), aluminium (MSR-020A) or steel (MSR-020S) chassis plate.
The manual's gear ratio table names the kit-standard 90T spur, a 21T drive pulley (MS-630-2) and a 42T pulley (MS-501M-2), and prints the secondary reduction as 2.0, with the formula spur ÷ pinion × 2.0.
The kit's gear diff oil is #7500 (Yokomo's scale).
Motor, pinion, speed controller, tires and wheels are not included.
Yokomo lists the MS2.1 as the newer version.
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.
