Outside of the set of useful-for-most-people-without-motorcycles tools... I think the things I use the most are all consumables like heat shrink tubing, loctite, lube, brake cleaner, etc...
Which gives me some ideas:
You'll have to do some recon on brand, but for the guy who has everything, I put forth this suggestion: new rechargeable batteries. The batteries for my cordless drill tend to go to crap in the span of about two years. Even better: look for one that comes with a two-slot charger.
For a guy who has that covered, my next idea is coveralls. You get down on the pavement enough times, you wear a hole in a knee or the seat in one of those things.
Which gives me some ideas:
You'll have to do some recon on brand, but for the guy who has everything, I put forth this suggestion: new rechargeable batteries. The batteries for my cordless drill tend to go to crap in the span of about two years. Even better: look for one that comes with a two-slot charger.
For a guy who has that covered, my next idea is coveralls. You get down on the pavement enough times, you wear a hole in a knee or the seat in one of those things.