Wow thanks for all the support!! Have decided to do it all in 3 days. I am planning to ride from Caernarfon to caersws on the first day, caersws to merthyr on the second day and may take your advice and take the taff trail to cardiff. Any tips on which bike to use or any other essentials?
My preference would be to use a road or touring bike but a hybrid or MTB (with road tyres) would also be fine.
I would also :-
1. Make sure you train on the same bike you are going to use and ensure that you are comfortable when riding. Those small little niggles on a 30 mile run really start to irritate after 60-80miles.
2. Make sure the bike is in A1 condition before you start. Chain, brakes, tyres.
3. Take a couple of spare tubes, tyre levers, small multi-tool, possibly a chain splitter and a "power link" just in case .
4. Eat before you are hungry, drink before you are thirsty. Upto ~30 miles this isnt a problem but after ~50 miles any lack of food/fluid in the previous hours will start to have serious effects upon your performance and not easy to correct. In exterme cases you "bonk" (and you are then in trouble). When I did North to South Wales I made myself stop every 30miles (ish) just to take a break for 15-20mins and eat.
5. Not sure where you are based, but be aware North and mid Wales is not inundated with super-markets, shops, fast food etc. It can sometimes be many miles between places to stop for food. I would therefore carry at least some food with you. (flap-jacks/malt loaf).
6. Dont get too concerned with speed. Just keep the wheels turning and the miles will build up. The last thing you want to do is burn yourself out early on and suffer later.
7. Most importantly,
make sure you enjoy it!!!!. Some of the scenary is truly amazing.