Been riding a mountain bike for years and recently on the street only. Just got a new GT 5 Series and did my usual 14.5 mile loop 6 minutes faster! Any advise for riding the different style? The bars, brake/shifters and toe clip pedals will take some getting use too. The higher gears also killed my hill climbs and I have two short/steep hills near my house, would going to a 28 on the rear help noticeably over the 25 on there now?