Dh bike. -> that's subjective. Some bikes may be borderline between XC and DH
XC bike. -> Same as above
Am bike. -> Am ? Care to elaborate?
Cruiser. -> is an option indeed.
Wet bike. -> hmm ... too close to the mud special. Perhaps somewhere in the fall.
Dry bike. -> Like any normal BotM then?
DJ bike. -> Care to elaborate?
Street bike. -> Already mentioned that.
Retro looking new bike. -> Again, that's rather subjective.
Summer bike. -> That leaves nearly every bike eligible.
Winter bike. -> is an option, if it's clearly described.
Commuter. -> So you mean with lights etc?
Cyclo. -> That would be nearer to the Road section.
Custom framed bike. -> is an option indeed.
Bike from specific year. -> Too limiting. Besides, it's not always possible to determine the exact age.
Bike from africa. -> That'll be a BotM with 0 entries then.
(Insert colour) themed bike. -> possible. Will need to look into that.
The mrs bike. -> The Mrs can ride men's bikes too, so it'll be difficult to verify that it is indeed the Mrs' bike.
Trials bike. -> Dunno, do we have many trials bikes here?
Carbon bike. -> That's already in the list.
Steel bike. -> IIRC we had that recently, but I could be wrong.
Alu bike. -> IIRC we had that recently as well, but I could be wrong again.
Bike with something unique (i.e 1 of, not a unique feature found on all the same models). -> Perhaps 1 or 2 bikes would enter, or maybe the custom-framed ones, which were mentioned before.
Road bike - although we should probably leave that to the road guys. -> agree with your comment there.
Your lightest bike. -> Weight weenie BotM ? Tintin would love that. -22lbs BotM
Your heaviest bike. -> I'd put a weight limit on that as well. +35lbs club or something like that.