Arrowmax Spur Gear 48DP 69T-87T
- Product number: AM-348078
The main gears from Arrowmax are very precisely manufactured and work reliably in every 1:10 scale on-road model vehicle!
The 48DP gears are available with a number of teeth from 69 - 87 teeth.
1️⃣ What is the total gear ratio?
The total reduction ratio describes how often the motor must rotate so that the wheels rotate once. It results from the interaction of:
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Motor pinion (Pinion Gear): sits directly on the motor.
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Spur gear: is located on the center shaft or the differential.
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Differential reduction (if available, usually integrated in the gearbox).
The formula is basically:
Total transmission ratio=(main gear motor pinion)×differential reduction ratio\text{Gesamtübersetzung} = \left(\frac{\text{Hauptzahnrad}}{\text{Motorritzel}}\right) \times \text{Differenzialuntersetzung}Totalu¨translation=(Motor pinionMain gear)×Differential reduction
2️⃣ Influence of pinion and main gear
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Larger pinion (more teeth) → less reduction → higher speed, less torque, higher motor temperature.
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Smaller pinion → more reduction → more torque, lower top speed, engine runs cooler.
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Larger main gear → more reduction → more torque.
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Smaller main gear → less reduction → more speed.
3️⃣ Example calculation
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Motor pinion = 20 teeth
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Main gear = 80 teeth
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Differential reduction = 2.6 (assumed)
8020=4\frac{80}{20} = 42080=4 4×2.6=10.44 \times 2.6 = 10.44×2.6=10.4
→ This means: The motor rotates 10.4 times so that the wheels rotate 1time
4️⃣ Practical effects
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Smaller pinion or larger main gear → better for offroad, crawlers, high torque.
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Larger pinion or smaller main gear → better for on-road, speed runs, high speed.
5️⃣ Important tip
Alwayspay attention to motor and controller temperature when changing pinion/main gear - too little gear reduction (too fast setup) causes the motor to overheat quickly.
| Spur Gears / Pinion Gears: | Spur Gears 48dp |
Ergänzende Informationen / Additional information
Verantwortlicher / Responsible
ToniSport GmbH
Füllscheuer 30, 56626 Andernach
GER
https://www.tonisport.de/
info@tonisport.de
Hersteller / Manufacturer
Freemax Technology Co., Ltd
FlatC, 2/F. Infotech centre, 21 Hung To Road, Kwun Tong, Hong Kong
CN
https://am-arrowmax.com/
sales@arrowmax-rc.com
 | ACHTUNG: Nicht für Kinder unter 36 Monaten geeignet wegen verschluckbarer Kleinteile, Erstickungsgefahr. CAUTION: Not suitable for children under 36 months due to small parts that can be swallowed, choking hazard. |
| ACHTUNG: Nicht für Kinder unter 14 Jahren geeignet. Benutzung unter unmittelbarer Aufsicht von Erwachsenen. CAUTION: Not suitable for children under 14 years of age. Use under the direct supervision of adults. |
Sicherheitshinweise GHS / H-Sätze | Safety instructions / Hazard Statements
- H 315: Verursacht Hautreizungen (Causes skin irritation)
- H 319: Verursacht schwere Augenreizung (Causes severe eye irritation)
- H 335: Kann die Atemwege reizen (May irritate the respiratory tract)
Sicherheitshinweise GHS / P-Sätze | Safety instructions / Precautionary Statements
- P 102: Darf nicht in die Hände von Kindern gelangen. (Keep out of the reach of children.)
- P 261: Einatmen von Staub / Rauch / Gas / Nebel / Dampf / Aerosol vermeiden. (Avoid inhalation of dust / smoke / gas / mist / vapour / aerosol.)
- P 271: Nur im Freien oder in gut belüfteten Räumen verwenden. (Only use outdoors or in well-ventilated rooms.)
- P 280: Schutzhandschuhe / Schutzkleidung / Augenschutz / Gesichtsschutz tragen. (Wear protective gloves / protective clothing / eye protection / face protection.)
- P 305+351+338: Bei Kontakt mit den Augen: Einige Minuten lang behutsam mit Wasser spülen. Vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen (In case of contact with eyes: Rinse cautiously with water for several minutes. Remove any contact lenses if possible. Continue rinsing)
- P 312: Bei Unwohlsein Giftinformationszentrum oder Arzt anrufen. (If you feel unwell, call a poison information centre or doctor.)
- P 405: Unter Verschluss aufbewahren. (Store under lock and key.)
- P 501: Inhalt/Behälter … zuführen. (Feed contents/container ....)
Sicherheitshinweise / EUH | Safety instructions / EUH
- EUH 202: Cyanacrylat. Gefahr. Klebt innerhalb von Sekunden Haut und Augenlider zusammen. Darf nicht in die Hände von Kindern gelangen. ()