Motorcycles...

So many to choose from! Everything shown is 1:6 scale. 

Motorcycles

The 3 main brands of 1:6 scale bikes are New Ray, Race Image, & Guiloy, but there are some others as well.

New Ray is probably the best known & most widely found, I.E. in Toys R Us & KB Toys. They have a variety of dirt & street bikes. 21st Century Toys bundled at least 4 figures with New Ray's bikes.

Race Image has a few dirt bikes (that I've seen). I don't have any of theirs, but they look very detailed.

Guiloy cycles are more adult collectibles rather than toys. They're at least 3-4 times the cost of a New Ray bike. I've only seen them at a couple of specialty websites, never in any toy stores. 

Note: Soldiers Of The World also has 2 or 3 figures bundled with dirt bikes.  I'm not sure if they manufacture those themselves or not.

Honda XR400

variants by New Ray (these 4 & top 3 on right column)

Baja 1000 by Race Image (Toy Zone)

Metal Mulisha by Race Image (Toy Zone)

Yamaha YZ250 by New Ray

Kawasaki 250 by Race Image (Toy Zone)

LBZ by Race Image (Toy Zone)

Choppers & Hogs

Crossroads by 21st Century Toys

 (came with villain biker; Beech). 

Purple Reign

A custom job done & owned by my friend, The Worm. Several collectors have modified New Ray Indians into choppers.

Again, a custom job. Before & after pictures shown. This bike was done & is owned by Xxian, a fellow collector.

Harley Davidson by Barbie (Mattel)

I hear this one is a much more precision model than the other Barbie vehicles, New Ray like in detail.

Fatboy by New Bright

Here's a remote controlled bike. This one is 1:6 scale, not to be confused with their 1:10 Harley.

V-Rod by New Bright

Another remote controlled bike.

(images by Inspired Diecast, used without permission)

Arlen Ness Customs by Iron Legends

Now available in several styles & colors.

Orange County Choppers by OCC

I'm not sure what company actually manufactures these replicas, but they're designed by the guys who make the real bikes. I hear these are a bit underscale.

1943 Indian variants by New Ray

Various bikes by Guiloy

(top 1948 Indian Chief, "Custom", Classic American Iron, 1980 Yamaha 750se