Domain name and niche to microniche problem. To much choices

[Andreas]

Falling a bit behind due to holiday.
I've found a couple of micro niches within same niche.
My question is should I make one site that hosts all those microniches or make one website per microniche.
It goes like this (not my niche).
Niche-microniche
vintagecar-tires
vintagecar-windows
vintagecar-seats
and so forth.
So basically. Should I get the domain vintagecar.com and then put the micros in folders
vintagecar.com/tires. or each of the microniches .com vintagecartires?

[EDIT]
I went with a top level keyword phrase and and made the microniches categories instead.

[Bill Thomson]

[EDIT]
I went with a top level keyword phrase and and made the microniches categories instead.

Andreas hopefully you followed GuruBobs module one Day 7 video and made sure that all those category keyphrases actually qualify as category keywords in Googles eyes by running the top level keyword through a Market Samurai search and making sure that the category keywords show up as a subset of the top level keyword and that they all meet the 80/15/30,000 Challenge traffic rule. If you have and they pass then you should be fine if you have lots of good choices.

Bill