I'm going to be customizing a 2007 street bob. What's the widest tire/wheel it can accommodate?
I want something like the one in the attached pic...

 

That depends on how far you want to take your customizing. Are you talking rear tire, front tire or both?

 

I'd like a 130/18 on the front and a 180/18 on the back. Same as the fat bob

 

180 fits stock in rear... 120 fits up front. Been running the night dragons in those sizes, no mods need.

 

Good news on the 180 rear fitting....
Guess I'll have to get fatbob trees for the 130 front

 

I'm in the process of getting a custom 17" front wheel built to take a 140/75x17 Fat Boy front tire. I've already fitted Fat Bob trees and a kit to make the standard hub and brake rotor fit. I did consider trying to squeeze a fatter 17" rim and tire with the stock trees but wrote it off due to space between the sliders although a 130 might fit. A forum member called Gunnybob has done it.

 

130/80/17 on stock sb front end. There's plenty of room.

 

200 will fit in the rear on a wider rim of course. I run 18x5.5 and 200/50/18 Metzeler.

 

Shoulda gone 6".

 

Why? Bike rides and handles fine and has been since early 2011 when I installed it and has been thru 2 tires since then. No issues. This wheel/tire combo has been done many times before.