Hi Hugo,
It sounds like you have reasonably sized budget. What about filming a mini movie of sorts showcasing what the parts can do when in action. Then you could do a launch film screening premiere at the shop with maybe some raffle prizes, food/drink, your movie and possibly another short more famous movie already out on off road motorcycles (or maybe edit a montage of you tube videos or something). This way you keep everyone at the shop the entire time, you create a cool advertisement/product you could use later on for marketing and you do not run the risk of someone getting hurt on you "sponsored ride". If done well enough you may even be able to get a few companies to donate/pay for the giveaways in exchange for the advertising.
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