Bikers & Tattoos have been hand in hand,since they both met 80 yrs back.  It's not easy to narrow it down to one thing,it could be a rite of passage,tradition, allegiance or simply a case of FTW.
 Imagery has always played a big part in the romance of the biker, whether it's a mural on a gas tank,a carved leather seat,a club patch or a tattoo. The tattoo is the only thing in his life, that he is certain to take to the grave. Bikes will be bought and sold,women will definitely come and go,he will constantly be defending a patch, if he wears one,but that tattoo will go everywhere with him. The tattoo will witness every dirty deed,but remain silent,it can't talk, but will speak volumes when needed. When all is said and done and his brothers throw the dirt in on top of his casket,his tattoo will have done it's job,living the life,rolling with the punchs and finally resting in peace.