{"product_id":"chihai-chs-gm25-25by-25mm-geared-stepper-motor-driver-options","title":"CHIHAI CHS-GM25-25BY 25mm Geared Stepper Motor with Driver Options","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe \u003ca class=\"tophitek-context-link\" href=\"https:\/\/rcdrone.top\/collections\/chihai-motor\/\" style=\"font-weight:600;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:0.15em;\"\u003eCHIHAI MOTOR\u003c\/a\u003e CHS-GM25-25BY is a 25 mm \u003ca href=\"https:\/\/rcdrone.top\/collections\/electric-motors\"\u003egeared stepper motor\u003c\/a\u003e with two-phase, four-wire bipolar operation, a metal reduction gearbox and a 4 mm D-shaped shaft. Choose the reduction ratio and a motor-only or driver, mounting-bracket and power-supply package for compact positioning mechanisms.\u003c\/p\u003e\u003ch2\u003eFeatures\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePermanent-magnet stepper design with reversible rotation and discrete position control.\u003c\/li\u003e\n\u003cli\u003eMetal reduction gears and a protected wiring PCB.\u003c\/li\u003e\n\u003cli\u003eTen selectable nominal reduction ratios from 4:1 to 100:1.\u003c\/li\u003e\n\u003cli\u003eOptional push-button driver board, enclosed driver, bracket and power supply as named in the package.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eItem\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eCHS-GM25-25BY \/ GM25GA-25BY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003ePermanent-magnet, bipolar, 2-phase 4-wire stepper with metal reduction gears\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated motor reference\u003c\/td\u003e\n\u003ctd\u003e12V DC with L6219 driver; 300 mA per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhase resistance\u003c\/td\u003e\n\u003ctd\u003e10 ohm ±7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhase inductance\u003c\/td\u003e\n\u003ctd\u003e7.5 mH per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput step angle\u003c\/td\u003e\n\u003ctd\u003e15 degrees per step\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExcitation\u003c\/td\u003e\n\u003ctd\u003e2-phase excitation; bipolar drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003ePHR-4, 2.0 mm pitch, white 4-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead wire\u003c\/td\u003e\n\u003ctd\u003eUL1571 AWG28; 150 ±10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor diameter\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput shaft\u003c\/td\u003e\n\u003ctd\u003e4 mm D-shaft; flat dimension 3.5 mm; projection 12 mm; D-flat length 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront boss\u003c\/td\u003e\n\u003ctd\u003e7 mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor rear length\u003c\/td\u003e\n\u003ctd\u003e14.8 mm; gearbox L depends on ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e2 x M3 tapped holes, 17.0 mm spacing; check drawing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet motor mass\u003c\/td\u003e\n\u003ctd\u003eApproximately 75 g; ratio dependent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePull-out torque, input motor\u003c\/td\u003e\n\u003ctd\u003eMore than 60 gf·cm at 100 pulses\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolding torque, input motor\u003c\/td\u003e\n\u003ctd\u003eMore than 75 gf·cm at 0 pulses\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum response frequency\u003c\/td\u003e\n\u003ctd\u003eMore than 1300 pulses\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum starting frequency\u003c\/td\u003e\n\u003ctd\u003eMore than 800 pulses\/s in parameter table; application guidance recommends starting at 300 pulses\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoil insulation\u003c\/td\u003e\n\u003ctd\u003eClass E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation resistance\u003c\/td\u003e\n\u003ctd\u003e100 MΩ at 500V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDielectric test reference\u003c\/td\u003e\n\u003ctd\u003e100V AC for one second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e-10 to +55 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eReduction Ratio and Performance\u003c\/h2\u003e\u003cp\u003eThe selector uses nominal ratios. The 4, 9, 15, 20, 34, 45, 57, 75 and 100 selections correspond to approximately 4.4, 9.3, 15.46, 20.41, 34.01, 44.9, 57, 74.83 and 98.78 reference ratios. The 25.8:1 option is sold but has no separate performance or gearbox-length column. Do not infer its torque or length from adjacent ratios.\u003c\/p\u003e\u003cp\u003eThe following is a 12V family reference at 700 input pulses\/s, not a guarantee for every selected package. Ratios above 100:1 are reference-only and are not sold here. Holding and pull-out torque are different; torque is not a payload rating.\u003c\/p\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eReference ratio\u003c\/th\u003e\n\u003cth\u003eOutput step (°)\u003c\/th\u003e\n\u003cth\u003eNo-load rpm at 700 pps\u003c\/th\u003e\n\u003cth\u003eHolding (kgf·cm)\u003c\/th\u003e\n\u003cth\u003ePull-out (kgf·cm)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.4\u003c\/td\u003e\n\u003ctd\u003e3.4\u003c\/td\u003e\n\u003ctd\u003e397.7\u003c\/td\u003e\n\u003ctd\u003e≥0.3\u003c\/td\u003e\n\u003ctd\u003e≥0.25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9.3\u003c\/td\u003e\n\u003ctd\u003e1.61\u003c\/td\u003e\n\u003ctd\u003e188.2\u003c\/td\u003e\n\u003ctd\u003e≥0.6\u003c\/td\u003e\n\u003ctd\u003e≥0.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e116.7\u003c\/td\u003e\n\u003ctd\u003e≥1.0\u003c\/td\u003e\n\u003ctd\u003e≥0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e0.75\u003c\/td\u003e\n\u003ctd\u003e87.5\u003c\/td\u003e\n\u003ctd\u003e≥1.3\u003c\/td\u003e\n\u003ctd\u003e≥1.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e0.44\u003c\/td\u003e\n\u003ctd\u003e51.5\u003c\/td\u003e\n\u003ctd\u003e≥2.0\u003c\/td\u003e\n\u003ctd\u003e≥1.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e44.9\u003c\/td\u003e\n\u003ctd\u003e0.33\u003c\/td\u003e\n\u003ctd\u003e38.98\u003c\/td\u003e\n\u003ctd\u003e≥3.0\u003c\/td\u003e\n\u003ctd\u003e≥2.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e0.26\u003c\/td\u003e\n\u003ctd\u003e30.7\u003c\/td\u003e\n\u003ctd\u003e≥3.5\u003c\/td\u003e\n\u003ctd\u003e≥3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e74.8\u003c\/td\u003e\n\u003ctd\u003e0.2\u003c\/td\u003e\n\u003ctd\u003e23.4\u003c\/td\u003e\n\u003ctd\u003e≥5.0\u003c\/td\u003e\n\u003ctd\u003e≥4.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e98.8\u003c\/td\u003e\n\u003ctd\u003e0.15\u003c\/td\u003e\n\u003ctd\u003e17.7\u003c\/td\u003e\n\u003ctd\u003e≥6.5\u003c\/td\u003e\n\u003ctd\u003e≥5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e0.12\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e≥8.0\u003c\/td\u003e\n\u003ctd\u003e≥7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e165\u003c\/td\u003e\n\u003ctd\u003e0.09\u003c\/td\u003e\n\u003ctd\u003e10.6\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e217\u003c\/td\u003e\n\u003ctd\u003e0.069\u003c\/td\u003e\n\u003ctd\u003e8.1\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e362\u003c\/td\u003e\n\u003ctd\u003e0.041\u003c\/td\u003e\n\u003ctd\u003e4.8\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e478\u003c\/td\u003e\n\u003ctd\u003e0.031\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003ctd\u003eDo not exceed 9.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eMechanical Dimensions\u003c\/h2\u003e\u003cp\u003eAll dimensions are millimetres. The original drawing specifies L ±0.3, a 2.5 mm front section, a 0.5 mm rear step, 6 mm rear boss, 3.7 mm connector offset and 9.2 mm connector height. Use the selected ratio and physical mounting drawing before machining; the 57:1 and 25.8:1 gearbox lengths are not separately specified.\u003c\/p\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eActual ratio references\u003c\/th\u003e\n\u003cth\u003eGearbox length L (mm)\u003c\/th\u003e\n\u003cth\u003eGear stages\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e4.4 \/ 9.3 \/ 15.46 \/ 20.41\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e2 \/ 3 \/ 4 \/ 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e34.01 \/ 44.9\u003c\/td\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e74.83 \/ 98.78\u003c\/td\u003e\n\u003ctd\u003e23\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e164.63 \/ 217.31\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e362.18 \/ 478.08\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eWiring and Control\u003c\/h2\u003e\u003cp\u003ePin 1 yellow is phase B, pin 2 red is the opposite B winding end, pin 3 black is phase A, and pin 4 blue is the opposite A winding end. Coil pairs are yellow\/red and black\/blue. Use a bipolar stepper driver, not a direct DC connection. Rotation follows the phase excitation sequence; the drawing views rotation from the flange side.\u003c\/p\u003e\u003cp\u003eThe motor reference is 12V. A 5–24V driver-supply range is discussed for current-controlled operation; higher supply voltage requires appropriate current limiting and does not make every included board or power supply a 24V item. Set phase current appropriately. Guidance suggests starting near 300 pulses\/s and increasing toward approximately 700 pulses\/s; usable speed depends on load and acceleration. The general 100–1300 pulses\/s control range and higher unloaded response references are not guaranteed starting frequencies.\u003c\/p\u003e\u003ch2\u003ePackage Selection\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePackage\u003c\/th\u003e\n\u003cth\u003eContents\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor Only\u003c\/td\u003e\n\u003ctd\u003eOne motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Bracket\u003c\/td\u003e\n\u003ctd\u003eOne motor + mounting bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Driver\u003c\/td\u003e\n\u003ctd\u003eOne motor + push-button driver board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Enclosed Driver\u003c\/td\u003e\n\u003ctd\u003eOne motor + driver in enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Bracket + Driver\u003c\/td\u003e\n\u003ctd\u003eOne motor + mounting bracket + push-button driver board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Power Supply + Driver\u003c\/td\u003e\n\u003ctd\u003eOne motor + power supply + push-button driver board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor + Bracket + Power Supply + Driver\u003c\/td\u003e\n\u003ctd\u003eOne motor + mounting bracket + power supply + push-button driver board\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003cp\u003eThe enclosed-driver option includes its case; other driver packages show an open board. Photographed adapter plug style and board revision are visual references; no unverified input rating or control-interface protocol is promised. Motor-only and bracket packages require a separate suitable driver and supply.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cp\u003eUse the motor for compact indexing, positioning, instrument adjustment and small robot mechanisms where discrete step control and reduction gearing are useful. Match required speed, torque, duty cycle and backlash tolerance to the actual mechanism.\u003c\/p\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cp\u003eOne selected motor configuration with its attached four-wire lead. The bracket, driver, enclosure and power supply are included only when named in the chosen package. No complete robot, external controller or other application assembly is included.\u003c\/p\u003e\u003ch2\u003eInstallation and Operation\u003c\/h2\u003e\u003cp\u003eKeep within the rated load, including shaft loads. Check the coil pairs and current setting before power-up. Increase load gradually during commissioning. Avoid severe impacts and do not force or pry the gearbox shaft. Long operation, supply voltage, speed and load affect motor temperature; provide adequate cooling.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eCan this four-wire motor connect directly to DC power?\u003c\/h3\u003e\u003cp\u003eNo. It needs the correct two-phase bipolar excitation from a suitable stepper driver.\u003c\/p\u003e\u003ch3\u003eIs the 25.8:1 option the same as 34:1?\u003c\/h3\u003e\u003cp\u003eNo. It is a separate selectable ratio. Its own torque and gearbox length are not listed, so confirm the required mechanical envelope before installation.\u003c\/p\u003e\u003ch3\u003eWhich packages include a power supply?\u003c\/h3\u003e\u003cp\u003eOnly Motor + Power Supply + Driver and Motor + Bracket + Power Supply + Driver include one.\u003c\/p\u003e\u003ch2\u003eVisual Details\u003c\/h2\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-dimensions.webp?v=1792662421\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"CHS-GM25-25BY - original mechanical drawing\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-dimensions.webp?v=1792662421\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eCHS-GM25-25BY - original mechanical drawing\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-wiring.webp?v=1792662427\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Two-phase four-wire bipolar connection\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-wiring.webp?v=1792662427\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eTwo-phase four-wire bipolar connection\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-ratings.webp?v=1792662435\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Motor input ratings - 12V reference\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-ratings.webp?v=1792662435\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eMotor input ratings - 12V reference\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-performance.webp?v=1792662442\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Reduction gearbox performance references\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-performance.webp?v=1792662442\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eReduction gearbox performance references\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-ratio-length.webp?v=1792662449\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Gearbox length and nominal ratio selection\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-ratio-length.webp?v=1792662449\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003eGearbox length and nominal ratio selection\u003c\/figcaption\u003e\u003c\/figure\u003e\u003cfigure\u003e\u003ca href=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-operation.webp?v=1792662457\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg alt=\"Package selection and operation\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/chihai-gm25-25by-operation.webp?v=1792662457\" style=\"max-width:100%;height:auto\"\u003e\u003c\/a\u003e\u003cfigcaption\u003ePackage selection and operation\u003c\/figcaption\u003e\u003c\/figure\u003e","brand":"CHIHAI MOTOR","offers":[{"title":"Motor Only \/ 4:1","offer_id":68091310473440,"sku":"CHI-GM2525BY-6864-001","price":29.62,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 9:1","offer_id":68091310506208,"sku":"CHI-GM2525BY-6864-002","price":29.62,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 15:1","offer_id":68091310538976,"sku":"CHI-GM2525BY-6864-003","price":29.62,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 20:1","offer_id":68091310571744,"sku":"CHI-GM2525BY-6864-004","price":29.62,"currency_code":"USD","in_stock":true},{"title":"Motor Only \/ 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