the english manual i received with my bike states that mine only does 28 Mph \ 45 Kph, and the french version stated differently as well and said up to 50 kph...lol Im after riding along side an ATV doing 36-37 Mph \ 60 KPH although i can't vouch for that bikes accuracy. Despite this the ebay listing for my bike stated it was able to do 45 Mph \ 72 Kph depending on rider size and driving conditions. This bike will never reach 45 MPH stock probably not even down hill with a 50 pound rider especially with the stock gearing
Either way its still faster then 28 MPH and hell of alot of fun
hopefuly can squeeze a few more Mph out of it next week when the 7 tooth pinion goes on it.