Yeah I've made a mistake haha, I have 59t rear and 16t front, it's very low geared so ordered a 17t front sprocket for a test since it was only Β£4 and I shouldn't have to cut the chain, will see how it goes but the bike pulls very strong up to 140kmh right now and wheelies on throttle sitting forward in 1st so hopefully it should have the grunt to pull enough in 6th with new sprocket.