I got my first road bike (Zeal) about 1 month ago and was having trouble making smooth gear changes. Everytime I changed gears the bike felt jerky but I put it down to being a newbie and needing to get used to the bike. Well that was ok for the first week or 2 but after a month I thought no there has to be more to it so I started searching this site for possible causes. The 2 most likely culprits were loose chain and throttle needing adjusting. Well I looked at the chain and assumed (never assume when you know nothing about bikes) it was ok as it didn't feel loose so I looked at the throttle. Well the throttle does have a fair bit of play so I'm thinking that'll be it but how do I adjust it . I checked the service manual and all it says is take it to a bike mechanic, it was back to this site for some more searching. Then I came along a thread that mentioned chains needed to be measured for total slack up and down not just down, oops. My bike has a tolerance of 20-30mms so I measured mine and it was about 30mm just by pushing it down so total was around 60-70mm of slack in the chain, what a goose I am. So straight away I adjust it and go for a quick ride and it feels like a new bike. The gears changes are smooth and once I work out how to adjust the slackness in the throttle it'll only make it better. The throttle seems to have around 7-12mm on play which is to much as my bike manual recommends 3-7mm only. If anyone knows where the adjustments are made I'ld appreciate it as I can't locate it. I might have to remove some fairing to spot it.