Your chain may be too tight, look for 1-2cm of vertical movement in the chain, tighter will probs be too tight.
Your fixed sprocket could also be smaller than your freewheel meaning you're on a higher gear?
When I swamped the wheel round I marked the frame so it went back to the same place as on the free-wheel so i'll check them out when i get home! thanks
Your chain may be too tight, look for 1-2cm of vertical movement in the chain, tighter will probs be too tight.
Your fixed sprocket could also be smaller than your freewheel meaning you're on a higher gear?