[Beer4blood]

I feel confident they're the three spokes similar to what my 99 zx6r had. It called for 170 stock but I ran 180 on out always with no trouble

[92xjunker]

That rim style was used on a couple bike models.

[Beer4blood]

I'm gonna say the ninja was a much wider rim....anyways I measured or rather did the best possible with a tire still on the rim looks to be 4" not counting the flare of the lips.

[92xjunker]

If measured correct it's not a kat wheel, the post is 3.5"

[TRPUT]

The size should be embossed on the rim.

http://www.ebay.com/itm/2005-Suzuki-Katana-GSX-600-F-98-06-750-rear-wheel-rim-brake-rotor-OEM-Straight-/231552064714?hash=item35e9941cca:g:wNkAAOSwqu9VR6tM&vxp=mtr

[katanarider]

If measured correct it's not a kat wheel, the post is 3.5"

You mean 4.5"

[92xjunker]

Ummmmm, yeah..... Pre 90 3" Pre is 3.5" post 4.5"

[Beer4blood]

So what's the tire limit with pre?

[92xjunker]

88-89 140. 90-97 150.

[Beer4blood]

Christ that's skinny....alright cool

[92xjunker]

if you have a post wheel some 170's fit those