as paul said you would be better off lookin into a second hand frame and forks.Best bets are on this website the'bikes for sale area',ebay is another one cuse theres always cheap frames like onzas,planet x,saracen,monty and sometimes the odd echo,zoo,gu,adamant or koxx.There is also mbuk readers adds but you will need to sign up to read through them what ant to bad really and they always have cheap full trials bikes andsome frames and forks on there.I think thats most of them really unless i missd a few then sorry about that and the same again for forks try pace forks if you can still get ahold of them they would work pritty well on ur subway frame but as paul said better to get a second hand frame and forks. biddle