The browniewith its cream tyres and stylish gloss paintwork the brownie is always a welcome addition to the bike shed new for 2015 bobbin have added to their standard sizes both a larger 52cm dutch frame size with bigger 700c wheels and petite pre teen 33cm frame with smaller 24 wheels something for everyone shimano 7 speed drivetrainloaded with a shimano tourney rear derailleur and a shimano rapid fire shifter a silky smooth gear change is what you will get here a wide range of gears