Yeah, why are you here asking this? If he's been building bikes for customers he should know what they want. He should know what does and dosent sell, what is more common to his area. Like I'm in jersey, paddle tire sales aren't through the roof here. Hill shooter chassis don't exist here.
But hole shots and boost bottles sell like crazy.
If he dosent know what people want now then he's behind the curve and shouldn't get involved.