RFN Thunder110 Pro Pit Bike SX-E400 50 tyre is a direct

50 tyre is a direct OEM-style replacement for the original tyre fitted to Revvi 18” bikes

10mph and 12mph modes

If you are choosing mainly by rider height

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RFN Thunder110 Pro Pit Bike SX-E400 50 tyre is a directRFN Thunder 110 Pro 110cc Pit Bike Quick Overview Best for: riders stepping up from smaller automatic bikes. Engine: FH 110cc 4 stroke single cylinder engine. Gearbox: 4 speed semi automatic no clutch lever needed. Wheels: 14 inch front 12 inch rear pit bike setup. Why riders choose it: more power than the Thunder 70, proper 14 12 sizing, hydraulic brakes and easy semi auto progression. Our view: the natural middle step in the RFN Thunder petrol range