Duty Spur Gear
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 HPI Savage 47T Heavy Duty Steel Spur Gear Hub Set  US $39.99
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 HPI Savage 49T Heavy Duty Steel Spur Gear Hub Set US $39.99
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 NEW HPI Racing Heavy Duty Aluminum Spur Gear Mount 87559 NIB US $37.99
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 HPI Heavy Duty Spur Gear 52TSAVXL HPI77132 US $29.89
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 HPI Savage Heavy Duty Spur Gear 49T 33411 US $29.50
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 NEW HPI Racing Heavy Duty Spur Gear 43 Tooth Savage Flux HP 102091 NIB US $28.49
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 HPI Savage Heavy Duty Spur Gear 52T 33412 US $28.00
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 HPI 77132 Heavy Duty Spur Gear 52T US $27.20
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 HPI Savage FLUX HP Heavy Duty Spur Gear 45T 102095 US $26.00
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 HPI Nitro Savage XL Heavy Duty Spur Gear 52t HPI77132 US $25.82
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 HPI 86806 Heavy Duty Steel Spur Gear Set 47T NIB US $25.00
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 HPI RACING HEAVY DUTY SPUR GEAR 52 Tooth 52T 77132 US $25.00
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 HPI Savage 52T Heavy Duty Spur Gear HPI77132 US $24.99
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 HPI 102091 Heavy Duty Spur Gear 43 Tooth Savage Flux HP US $24.79
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 HPI 77132 Heavy Duty Spur Gear 52T Savage X 46 XL Flux US $24.79
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 HPI 102093 Heavy Duty Spur Gear 44 Tooth Savage Flux HP US $24.79
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 HPI Savage Flux 43T Heavy Duty Steel Spur Gear 102091 US $23.99
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 HPI Savage Flux 45T Heavy Duty Steel Spur Gear 102095 US $23.99
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 HPI 102093 Heavy Duty Spur Gear 44T US $23.81
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 NEW HPI Racing Heavy Duty Steel Spur Gear 47 Tooth 77127 NIB US $22.79
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 HPI 102091 Heavy Duty Spur Gear 43T Savage Flux US $21.88
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 HPI 102095 Heavy Duty Spur Gear 45T US $21.88
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 HPI 77127 HEAVY DUTY SPUR GEAR 47 TOOTH SAVAGE NEW NIP US $21.33
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 HPI 102095 Heavy Duty Spur Gear 45 Tooth Savage Flux HP US $20.79
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 HPI 77127 Heavy Duty Spur Gear 47 Tooth US $20.00
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 HPI Heavy Duty Steel Spur Gear 47 Tooth Savage 25 X 46 Flux HP 2350 US $18.79
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 GS Racing GSC STP40 Heavy Duty Center Spur Gear 46 T US $10.00
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 LOSI 40 tooth Spur Gear Mod 1 TEN SCTE by LOSB3436 heavy duty plastic US $4.99
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 HPI 76816 Heavy Duty 46T 2 Speed Spur Gear US $4.30
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can anyone tell me why heavy duty vehicles use spur gears instead of helical gears in manual transmissions?
i thought helical gears were better when it came to torque and higher performance.
Spur gears transfer the torque at 180 degrees with no side load. All of the stress is on the gears and not the thrust washers, case or shaft.
In a heavy duty vehicle, this allows for a lighter, stronger transmission where gear noise really isn't a factor.
On a helical gear, there is a significant amount of side force because of the gear angles. In lighter duty vehicles, this effect is out weighed by the quieter operation and greater wear area - but it also limits the torque which can be transferred.
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