a 20" bike is more twitchy...but for some reason i find a 26" easier..mainly because you are higher so its easier to get up stuff...this is what i found so this may not be the same for you but... if your looking for bike www.tartybike.co.uk is one of the most used websites...but try looking on ebay because they have some very good bikes for sales for small prices help this helps many thanks harri