Need some purchasing advice?

[cmcque05]

I am a 21 year old intermediate cyclist. Currently im just riding a standard moutain bike/Road bike you know cheap
and simple! Im looking this year however to up my game and start cycling events, im entering the London to Brighton in june
then doing John O Groates to Landsend a 9 day treck! Im just looking for some advice on what kind of bikes i need to
be looking for and any must have accessories anyone can suggest. Mainly the bike though as i have almost no idea what i am looking for.

Thanks Callum

 

[m0b00st]

Posting a budget would greatly help people point you in the right direction.