Best way to improve average speed

Firstly, I'm a total beginner so please be gentle with me 

I used to cycle a lot when I was a kid but I hardly touched a bike since my late teens. Now I'm 29, bought myself a new bike and have just started commuting on it. I'm in fairly good shape but it's mostly from lifting weights so not really the right kind of fitness for cycling. I had been running a few times a week but had to stop a couple of months ago due to an old knee problem coming back so my cardio fitness isn't bad but could be better.
My commute is 12 miles per day. I have to ride one way one day and then return the next, 4 or 5 times per week. Last week was only my second week doing it but I feel like I'm going too slowly. My average speed is around 14mph. The route isn't anything too challenging. Some flat but quite a lot of gentle up or downhill sections and a few steeper climbs.
I know it's still early days but I feel like 14mph average is below what I should be doing so I'm looking for the best way to improve. Is it just a case of improving as I add more miles or can I ride in certain ways (like using a heartbeat monitor and zone training) to speed things up? I want to start adding a longer ride at the weekend but I can't really fit in anything over 2 hours at the moment.
My bike is a Decathlon Sport 1 with Marathon Plus tyres, I have to carry certain things with me so I probably have an extra 3-4lbs of weight plus I weigh around 200lbs and I can't really afford to lose much. The lowest I ever get to is 185lbs but even then I start looking to thin because I have a large frame. I know the extra weight from everything won't be helping but I know if I get fit enough it shouldn't make too much of a difference.


I used to cycle a lot when I was a kid but I hardly touched a bike since my late teens. Now I'm 29, bought myself a new bike and have just started commuting on it. I'm in fairly good shape but it's mostly from lifting weights so not really the right kind of fitness for cycling. I had been running a few times a week but had to stop a couple of months ago due to an old knee problem coming back so my cardio fitness isn't bad but could be better.
My commute is 12 miles per day. I have to ride one way one day and then return the next, 4 or 5 times per week. Last week was only my second week doing it but I feel like I'm going too slowly. My average speed is around 14mph. The route isn't anything too challenging. Some flat but quite a lot of gentle up or downhill sections and a few steeper climbs.
I know it's still early days but I feel like 14mph average is below what I should be doing so I'm looking for the best way to improve. Is it just a case of improving as I add more miles or can I ride in certain ways (like using a heartbeat monitor and zone training) to speed things up? I want to start adding a longer ride at the weekend but I can't really fit in anything over 2 hours at the moment.
My bike is a Decathlon Sport 1 with Marathon Plus tyres, I have to carry certain things with me so I probably have an extra 3-4lbs of weight plus I weigh around 200lbs and I can't really afford to lose much. The lowest I ever get to is 185lbs but even then I start looking to thin because I have a large frame. I know the extra weight from everything won't be helping but I know if I get fit enough it shouldn't make too much of a difference.
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You have mentioned extra miles on the bike and you have your ride to work so it is all to the good.
You have realised that fitness on a bike is different to fitness elsewhere - you keep riding and it will slot into place. Base fitness takes time.
Try and keep things up over the winter months if possible and plan a goal for 2011 - be that a timetrial/race or sportive event.
I think you're right about setting a goal. I bought my current bike to get me started and as a winter bike but I plan on buying a new one next year when I'll hopefully understand what will suit me better. I think maybe having a goal and only buying the new bike when I've achieved it should keep me focused.
kieranb, it's partly through a busy town centre so around 3 miles is always slow due to traffic and lights, the rest is either quiet cycle path or A roads (A5117 and A548)
after a few weeks when you feel stronger and the ride gets easier try and speed things along (literally) by maybe trying to ride intervals on one or two of your journeys a week and start to take a longer route home now and again when time allows and you feel strong.
once you have more experience sit down at xmas and decide where you want to take your cycling and set some goals for 2011.
Since Tuesday I've pushed my average up to 16.5mph. Ok so it's still not exactly quick but it's a pretty big improvement if you look at it as a percentage. The tougher sections have felt much easier and that's meant I've been able to go faster on the flatter parts without really trying. I haven't made any changes at all so you were all right, it just takes time. Hopefully it'll keep improving like this.