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Gear Notes: "Modulus" is the metric systems way of expressing gear tooth pitch or size. In English or SAE gears teeth are counted per inch. So, a straight gear (like the rack in a rack and pinion setup) rated at 10tpi, would have 10 Teeth Per Inch. Modulus is used in the Metric system and it's an expression of how large each tooth is. Little different system but one thing is held true. A 10tpi and 14tpi SAE gears will not mesh with each other, the TPI numbers must match. Same for Metrics, the "Modulus" must be the same to mesh, a .4mod and .3mod gear will not work together. For GWS gears, all you really need to know is what power system series you have (LPS,IPS,EPS,EPS400 etc..) and the gear letter. On your existing spur gear has a letter is molded in. If you need to replace a "C" gear in your EPS350, forget about how many teeth it has, just order the "C" pinion or spur that you need in the EPS list. Pinions are the small metal gears on the motor. Spurs are the large plastic gears that are on your prop shaft.

A special note to gear purchasers for non-model aircraft purposes. We get many inquiry's asking if these gears will fit a Child's X-G-Wiz-Go toy or will repair a home kitchen device or etc. We are model aircraft experts, if it's a model aircraft gearbox, we can help figure out the part on the phone if your stuck. If it's a toy or special project outside the hobby, I can't begin to guess if our gear will mesh with your gear in your device. I can't tell from a photo what pitch your gear is. If your trying to fix a special item, my best suggestion is to purchase all the gears that look similar and have a go at it. Most gears are a few dollars or less.

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GWS LPS Replacement Pinion Gear C 10T 1.5mm - Product Image
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GWS LPS Replacement Pinion Gear C 10T 1.5mm

Replacement Pinion Gear LPS C Gear Ratio 10 tooth, pitch is modulus .25, 1.5mm bore. For RXC and RLC type LPS power systems.

The possible range of Ratios available for LPS Gearbox frames as follows:
Numeric NameLetter NameRatioSpur ColorSpur TeethPinion TeethModulus
#001A4:0:1Yellow48T12TM0.3
#002B5:0:1Blue50T10TM0.3
#003C6.2:1White62T10TM0.25

SKU Number: GWGER003

Price: $1.25 
Quantity:  

IPS Replacement Pinion Gear C & E 10T    - Product Image
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IPS Replacement Pinion Gear C & E 10T

Replacement Pinion Gear IPS "C & E Gear Ratio" 10 tooth, pitch is modulus .3, 1.5mm bore. For all IPS single and dual drive systems. Yes, this is the second most popular 1.5mm bore 10 tooth pinion many people order for the brushless tail motor conversion of the Blade MCPX.
SKU Number: GWGM10T3
Price: $1.25 
Quantity:  

 

EPS 100C,150C,300C,350C,370C Replacement Pinion Gear A, 16T

Replacement Pinion Gear EPS 100C,150C,300C,350C,370C A Gear Ratio" 16 tooth, pitch is modulus .4, 2.0mm bore.
SKU Number: GWEPS9A
Price: $1.25 
Quantity:  

 

EPS 100C,150C,300C,350C,370C Replacement Pinion Gear B, 14T

Replacement Pinion Gear EPS 100C,150C,300C,350C,370C B Gear Ratio" 14 tooth, pitch is modulus .4, 2.0mm bore.
SKU Number: GWEPS9B
Price: $1.25 
Quantity:  

 

EPS 100C,150C,300C,350C,370C Replacement Pinion Gear C, 12T

Replacement Pinion Gear EPS 100C,150C,300C,350C,370C C Gear Ratio" 12 tooth, pitch is modulus .4, 2.0mm bore.
SKU Number: GWEPS9C
Price: $1.25 
Quantity:  

 

EPS 280C/370C Replacement Pinion Gear E, 16T

Replacement Pinion Gear 280C,370C E, Gear Ratio" 16 tooth, pitch is modulus .5, 2.0mm bore.
SKU Number: GWEPS9E
Price: $1.25 
Quantity:  

 

EPS 280C/370C Replacement Pinion Gear F, 16T

Replacement Pinion Gear 280C,370C E, Gear Ratio" 16 tooth, pitch is modulus .4, 2.0mm bore.
SKU Number: GWEPS9F
Price: $1.25 
Quantity:  

 

EPS 280C/370C Replacement Pinion Gear H, 10T

Replacement Pinion Gear 280C,370C E, Gear Ratio" 10 tooth, pitch is modulus .5, 2.0mm bore.
SKU Number: GWEPS9H
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear B 26T - Product Image
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EPS 400C Replacement Pinion Gear B 26T

Replacement Pinion Gear EPS 400C B Gear Ratio" 26 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9B4C.
SKU Number: GWGM26T4
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear C 24T - Product Image
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EPS 400C Replacement Pinion Gear C 24T

Replacement Pinion Gear EPS 400C C Gear Ratio" 24 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9C4C.
SKU Number: GWGM24T4
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear D 22T - Product Image
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EPS 400C Replacement Pinion Gear D 22T

Replacement Pinion Gear EPS 400C D Gear Ratio" 22 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9D4C.
SKU Number: GWGM22T4
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear E 20T - Product Image
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EPS 400C Replacement Pinion Gear E 20T

Replacement Pinion Gear EPS 400C E Gear Ratio" 20 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9E4C.
SKU Number: GWGM20T4A
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear F 18T - Product Image
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EPS 400C Replacement Pinion Gear F 18T

Replacement Pinion Gear EPS 400C F Gear Ratio" 18 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9F4C.
SKU Number: GWGM18T4A
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear G 16T - Product Image
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EPS 400C Replacement Pinion Gear G 16T

Replacement Pinion Gear EPS 400C G Gear Ratio" 16 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9G4C.
SKU Number: GWGM16T4B
Price: $1.25 
Quantity:  

EPS 400C Replacement Pinion Gear H 14T - Product Image
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EPS 400C Replacement Pinion Gear H 14T

Replacement Pinion Gear EPS 400C H Gear Ratio" 14 tooth, pitch is modulus .4, 2.3mm bore. For all EPS 400C drive systems. Supercedes part number GW/EPSC-9H4C.
SKU Number: GWGM14T4B
Price: $1.25 
Quantity:  

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