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For TT (yellow plastic) DC gearbox motors, these wheels and add-ons are direct-fit options for common robot car builds:

Standard TT drive wheels

• D80mm Silicone TT Motor Wheel For Robot Project (80mm diameter, silicone tire) $2.75
• Orange and Clear TT Motor Wheel for TT DC Gearbox Motor (press-fit TT wheel) $4.15
• Thin White Wheel for TT DC Gearbox Motors - 65mm Diameter (65mm diameter) $3.35
• Skinny Wheel for TT DC Gearbox Motors (narrower profile for tighter chassis clearance) $5.35
• Black Multi-Hub Wheel for TT / Lego or N20 Motor - 65mm Diameter (65mm diameter, multi-hub insert fits TT/LEGO/N20-style use cases) $3.90

Omnidirectional (mecanum) options for TT/cross axle

• Right Mecanum Wheel - 48mm Diameter - TT Motor or Cross Axle (48mm diameter, right-hand wheel) $9.95
• Left & Right Mecanum Wheel Pair - 48mm Diameter (matched left/right pair for a mecanum set) $19.45

Specialty traction

• Paddle Wheel Pack for TT Gearbox Motor (paddle-style wheels for extra grip / fun robot builds) $3.90

Helpful companion parts (not drive wheels)

• 20mm Height Metal Caster Bearing Wheel (20mm height ball caster for a 3rd support point on 2WD TT robots) $4.85
• TT motor hub P3769 (hub adapter for attaching custom wheels/sprockets to TT shafts) $3.90

If you also need the motor itself, the matching base motor is TT Gearbox Motor (3–6VDC, standard TT footprint) $5.90.