So I've been riding my friends' bikes with their 750mm Burgtecs around the carpark, and they feel pretty good. I'm still on 685 EA70s. I fancy trying them out. But how long will it take me to get used to them? Will it have a negative effect on my riding for a while, or will I get used to them almost immediately? Obviously we're mid race season, and I wonder if I should wait until winter before I swap?