The specialized demo 8 650b mountain bike 2017 arrives in the fantastic m5 aluminium material this stiff overall light and seriously strong material creates a downhill ride that is more than capable of keeping up with the best at a fraction of the price the downhill mountain bike comes complete with a 15 forged head tube to help enhance these qualities as for the ride the demo 8 pairs s3 geometry with an asymmetric frame design that e