anybody got any info on these like what they can beat? any problems that occur with them? any info suspension, what they were built more for like hillclimbs, drags, mx.. what can be swaped from bike to bike. any the older guys on here like phragle or pauli b that grew up with the older 80's 90's bike any tips on them, looking to get one for around $600 completly stock is that a good price? thanks