The home page will have big picture of a bike, navigation on top, and a search bar. There will be a drop down menu when you hover over "Bikes" in navigation bar at top where you can choose a mountain bike, cruiser, etc. Or you can just click "bikes" and it will take you to a page where there will be filters on the left side to narrow down the options even further based on wheel size, price, etc. Also maybe a "build your own bike"/step-by-step option?
Hardtail
Full-suspension
Rigid
Drop-bar
Cyclocross
Flat-bar
Touring
Hybrid
Comfort
Cruiser
29er
Electric
Mountain Bikes
Road Bikes
Training Wheel Bikes
Cruiser Bikes
Push Bikes
Trailer Bikes
Urban bikes
Folding bikes
All-around
Free-style
Bike Commuting and Touring
Cycling
Mountain Biking
Recreational cycling
Road cycling
Triathlon
Urban cycling
Aluminum
Aluminum/Carbon
Carbon
Steel
Wood
Men's
Women's
Unisex
Boys'
Girls'
Kids'
12 in
16 in
20 in
24 in
26 in
27 in
27.5 in
29 in
Aero Bar
BMX Bar
Drop Bar
Flat Bar
Moustache Bar
Riser Bar
Coaster Brake
Disc Brake
Drum Brake
Rim Brake
1
2-9
10-19
20-26
27-30
Front/Seat suspension
Front suspension
No suspension
Seat suspension
3.5-3.75
5-7.75
10-14.75
15-19.75
20-99.75
$25-$100
$100-$250
$250-$500
$500-$800
$800-$1000
$1000-$2000
$2000+