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Parts / Option Parts

Take your RC car's performance to the next level with Koswork's option parts and hop-ups. From drivetrain upgrades and suspension components to chassis reinforcements — precision-engineered parts built for competitive RC racing.

Koswork Phillips Screwdriver PH1 4mm 1/4" Drive Hex Mini-Z Power Tip KOS13207-P1
Koswork Phillips Screwdriver PH1 4mm 1/4" Drive Hex Mini-Z Power Tip KOS13207-P1
$7.99
Koswork Phillips Screwdriver PH00 2mm 1/4" Drive Hex Mini-Z Power Tip KOS13207-P00
Koswork Phillips Screwdriver PH00 2mm 1/4" Drive Hex Mini-Z Power Tip KOS13207-P00
$7.99
Koswork 3mm Steel Heavy Duty Turnbuckle (2pcs) Associated Kyosho KOS12321/12327/12331/12335/12338/12345/12348/12358
Koswork 3mm Steel Heavy Duty Turnbuckle (2pcs) Associated Kyosho KOS12321/12327/12331/12335/12338/12345/12348/12358
$6.50
Koswork 4S 30cm Charge/Balance Extension Wire/Lead/Adapter (22AWG, XH Male to XH Female) KOS05071-430
Koswork 4S 30cm Charge/Balance Extension Wire/Lead/Adapter (22AWG, XH Male to XH Female) KOS05071-430
$4.49
Koswork 20cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-20
Koswork 20cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-20
$3.49
Koswork 15cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-15
Koswork 15cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-15
$2.99
Koswork 10cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-10
Koswork 10cm Soft Servo Extension Wire (Futaba/JR Plug) KOS05051-10
$2.49
Koswork Nitro Engine Starter Set (w/glow igniter set, fuel bottle, wrenches & screwdriver) KOS05006
Koswork Nitro Engine Starter Set (w/glow igniter set, fuel bottle, wrenches & screwdriver) KOS05006
$33.00
Koswork 64P 28T~47T Aluminum Thin Lightweight Pinion Gear KOS03004-28/29/30/31/32/33/34/35/36/37/38/39/40/41/42/43/44/45/46/47
Koswork 64P 28T~47T Aluminum Thin Lightweight Pinion Gear KOS03004-28/29/30/31/32/33/34/35/36/37/38/39/40/41/42/43/44/45/46/47
$8.00
Koswork 32P 14T~30T M0.8 Lightweight Hardened Steel Pinion Gear (for 5mm shaft, w/high torque set screw) KOS03000-14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30
Koswork 32P 14T~30T M0.8 Lightweight Hardened Steel Pinion Gear (for 5mm shaft, w/high torque set screw) KOS03000-14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30
From $10.50
Koswork P3 Low Friction O Ring (w/special o-ring grease) (for 3mm shaft) (8pcs) KOS02011
Koswork P3 Low Friction O Ring (w/special o-ring grease) (for 3mm shaft) (8pcs) KOS02011
$7.00
Koswork 4mm Hex Set Screws Hardened Steel Screw (w/container) (8) KOSSS403/404/405/408/504
Koswork 4mm Hex Set Screws Hardened Steel Screw (w/container) (8) KOSSS403/404/405/408/504
$3.49
Koswork 3mm Hex Set Screws Hardened Steel Screw (w/container) (8) KOSSS3026/303/304/305/306/308/310/312/316/320/325
Koswork 3mm Hex Set Screws Hardened Steel Screw (w/container) (8) KOSSS3026/303/304/305/306/308/310/312/316/320/325
From $3.49
Koswork 3mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS304/305/306/308/310/312/314/316/318/320/325/326/330/335/340
Koswork 3mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS304/305/306/308/310/312/314/316/318/320/325/326/330/335/340
$3.49
Koswork 2.5mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS2504/2506/2508/2510/2512
Koswork 2.5mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS2504/2506/2508/2510/2512
$3.99
Koswork 2mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS203/204/206
Koswork 2mm Flat Head Hex Hardened Steel Screw (w/container) (8) KOSFS203/204/206
$3.99
Koswork 3mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS306/308/310/312/314/315/316/318/320/322/324/325/326/328/330/335/340/345/350
Koswork 3mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS306/308/310/312/314/315/316/318/320/322/324/325/326/328/330/335/340/345/350
From $3.49
Koswork 2.5mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS2505/2506/2508/2510/2512/2514
Koswork 2.5mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS2505/2506/2508/2510/2512/2514
From $3.99
Koswork 2mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS204/205/206/208/210/216
Koswork 2mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS204/205/206/208/210/216
From $3.99
Koswork 1.6mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS1605
Koswork 1.6mm Cap Head Hex Hardened Steel Screw (w/container) (8) KOSCS1605
$5.99
Koswork Aluminum Nylon Lock Nuts (w/container) (8) KOSN1004/1004GD/1007/1007GD/1008/1009/1009F
Koswork Aluminum Nylon Lock Nuts (w/container) (8) KOSN1004/1004GD/1007/1007GD/1008/1009/1009F
On Sale from $4.50 $8.99 Sale
Koswork Kyosho Rear Outter (for 3x30mm) Hardened Hinge Pin/Suspension Shaft (2) Mid/Turbo/Optima/Javelin/Ultima KOS04344
Koswork Kyosho Rear Outter (for 3x30mm) Hardened Hinge Pin/Suspension Shaft (2) Mid/Turbo/Optima/Javelin/Ultima KOS04344
$9.80
Koswork Kyosho Front Outter 3x26mm Hardened Hinge Pin Suspension Shaft KOS04342
Koswork Kyosho Front Outter (for 3x26mm) Hardened Hinge Pin/Suspension Shaft (2) Mid/Turbo/Optima/Javelin/Ultima KOS04342
$9.80
Koswork Kyosho Rear Inner (for 3x58mm) Hardened Hinge Pin/Suspension Shaft (2) Mid Optima 2022 KOS04340
Koswork Kyosho Rear Inner (for 3x58mm) Hardened Hinge Pin/Suspension Shaft (2) Mid Optima 2022 KOS04340
$11.70
Koswork Kyosho Front Inner (for 3x54mm) Hardened Hinge Pin/Suspension Shaft (2) Mid Optima 2022 KOS04338
Koswork Kyosho Front Inner (for 3x54mm) Hardened Hinge Pin/Suspension Shaft (2) Mid Optima 2022 KOS04338
$9.10
Koswork Kyosho Mid Optima 2022 Carbon Steering Link Plate Set (w/bearings) KOS04334
Koswork Kyosho Mid Optima 2022 Carbon Steering Link Plate Set (w/bearings) KOS04334
$14.30
Koswork Kyosho Mid Optima 2022 Carbon Rear Stiffener/Gearbox Brace KOS04332
Koswork Kyosho Mid Optima 2022 Carbon Rear Stiffener/Gearbox Brace KOS04332
$11.70
Koswork Kyosho Mid Optima 2022 Carbon Front & Rear Suspension Plate Set KOS04330
Koswork Kyosho Mid Optima 2022 Carbon Front & Rear Suspension Plate Set KOS04330
$13.70
Koswork Kyosho Mid Optima 2022 Carbon Rear Camber Link Mount 3mm KOS04328
Koswork Kyosho Mid Optima 2022 Carbon Rear Camber Link Mount 3mm KOS04328
$17.60
Koswork Kyosho Mid Optima 2022 Carbon Rear Shock Tower 3mm KOS04326
Koswork Kyosho Mid Optima 2022 Carbon Rear Shock Tower 3mm KOS04326
$14.30
Koswork Kyosho Mid Optima 2022 Carbon Front Shock Tower 3mm KOS04324
Koswork Kyosho Mid Optima 2022 Carbon Front Shock Tower 3mm KOS04324
$18.20
Koswork Kyosho Mid Optima 2022 Carbon Shorty Lipo Battery Mount Set KOS04323
Koswork Kyosho Mid Optima 2022 Carbon Shorty Lipo Battery Mount Set KOS04323
$33.00
Koswork Kyosho Mid Optima 2022 Carbon Radio Plate/Tray/Upper Deck KOS04322
Koswork Kyosho Mid Optima 2022 Carbon Radio Plate/Tray/Upper Deck KOS04322
$39.00
Koswork Kyosho Mid Optima 2022 Carbon ESC Mount Set KOS04321-5
Koswork Kyosho Mid Optima 2022 Carbon ESC Mount Set KOS04321-5
$13.70
Koswork Kyosho Mid Optima 2022 Carbon Radio Plate/ESC Mount Set KOS04321
Koswork Kyosho Mid Optima 2022 Carbon Radio Plate/ESC Mount Set KOS04321
$52.00
Koswork Kyosho 5.8mm Hard Anodized 7075 Pivot Ball (4) Kyosho KOS04313
Koswork Kyosho 5.8mm Hard Anodized 7075 Pivot Ball (4) Kyosho KOS04313
$7.80
Koswork Kyosho +2mm Widened Wheel Hub Mid/Turbo/Optima/Javelin/Ultima (2) KOS04308
Koswork Kyosho +2mm Widened Wheel Hub Mid/Turbo/Optima/Javelin/Ultima (2) KOS04308
$10.40
Koswork Kyosho +1mm Widened Wheel Hub Mid/Turbo/Optima/Javelin/Ultima (2) KOS04307
Koswork Kyosho +1mm Widened Wheel Hub Mid/Turbo/Optima/Javelin/Ultima (2) KOS04307
$10.40
Koswork CVA Lightweight Aluminum Axle Cup (2) (for KOS04303) (for Team Associated B74 series) Kyosho KOS04303-3
Koswork CVA Lightweight Aluminum Axle Cup (2) (for KOS04303) (for Team Associated B74 series) Kyosho KOS04303-3
$7.50
Koswork Steel Heavy Duty Turnbuckle Set (7pcs, w/wrench) Kyosho Mid/Turbo/Optima/Javelin/Ultima KOS04301
Koswork Steel Heavy Duty Turnbuckle Set (7pcs, w/wrench) Kyosho Mid/Turbo/Optima/Javelin/Ultima KOS04301
$23.00
Koswork 53g Stick LiPo Weight 136x46x1.0mm KOS04232
Koswork 53g Stick LiPo Weight 136x46x1.0mm KOS04232
$9.00
Koswork 32g Stick LiPo Weight 136x46x0.6mm KOS04231
Koswork 32g Stick LiPo Weight 136x46x0.6mm KOS04231
$7.00
Koswork 36g Shorty LiPo Weight 94x46x1.0mm KOS04222
Koswork 36g Shorty LiPo Weight 94x46x1.0mm KOS04222
$7.00
Koswork 22g Shorty LiPo Weight 94x46x0.6mm KOS04221
Koswork 22g Shorty LiPo Weight 94x46x0.6mm KOS04221
$6.00
Koswork 10g Weight (2) KOS04202
Koswork 10g Weight (2) KOS04202
$7.00