I have a pair spesh bg sport mtb shoes and shimano pd m-324 pedals. I have had hip, knee and ankle probs and some physio and few exercises they have given has given me more flexibility in my foot (basically I couldn't clip out normally ie by moving my foot outwards - can now on right - still probs on left side however have multi-release cleats so can clip out by moving foot inwards). I ride a spesh sirrus comp, which is a flat bar road bike for those that haven't a clue. Basically how much more speed will I get out moving to clipless. Currently do 17-18mph average on my commute and get thumped by pensioners on bikes Next question then is how much can I expect to gain from then adding in a proper road bike with drops (one in the £800-£1000 range). Assume no other conditions change other than being clipped in and then clipped and on a road bike.