RFN Thunder110 Pro Pit Bike SX-E400 If your bike uses a

If your bike uses a smaller 2

Rider setup: designed to grow with the rider over time

If you are choosing mainly by rider height

Our view: the serious 125cc manual step before moving into the 140R

Battery & Ride Time

RFN Thunder110 Pro Pit Bike SX-E400 If your bike uses aRFN 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