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Fat bob swingarm on a Streetbob?

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Old Mar 5, 2026 | 06:41 AM
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Default Fat bob swingarm on a Streetbob?

Is it possible to gain some tire clearance on a FXDB using a Fatbob swingarm?
I'm looking for some extra width.
 
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Old Mar 5, 2026 | 07:26 AM
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Researching I see that the Fatbob swingarm will fit.
Only problem is the Fatbob uses a 16 wheel and tire.
Going to try the new tire on to see if it fits before I go any further.
 
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Old Mar 5, 2026 | 08:16 AM
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Don't know what tire size your looking to go to but the FXDB fender and supports will accept a 170 mm width.. 180 is too much...
 
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Old Mar 5, 2026 | 11:59 AM
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Some misinformation here. The fat Bob and the street Bob and all the other Dyna’s built from that era use the same swing arm, part # 47820-06. Rear wheels on these Dyna’s are interchangeable since they both use the same swing arm. These swing arms will accommodate a 180b/60/17 size tire as long as you reroute the blinker wires.
 
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Old Mar 5, 2026 | 12:01 PM
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Originally Posted by fskitch
Some misinformation here. The fat Bob and the street Bob and all the other Dyna’s built from that era use the same swing arm, part # 47820-06. Rear wheels on these Dyna’s are interchangeable since they both use the same swing arm. These swing arms will accommodate a 180b/60/17 size tire as long as you reroute the blinker wires.
Yes the swing arm will accommodate but the fender and the supports will be very tight..
 
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Old Mar 5, 2026 | 12:05 PM
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Originally Posted by fskitch
Some misinformation here. The fat Bob and the street Bob and all the other Dyna’s built from that era use the same swing arm, part # 47820-06. Rear wheels on these Dyna’s are interchangeable since they both use the same swing arm. These swing arms will accommodate a 180b/60/17 size tire as long as you reroute the blinker wires.
That's what I thought, same with the frame except for the FXDWG.
 
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Old Mar 5, 2026 | 12:15 PM
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Originally Posted by 98hotrodfatboy
Yes the swing arm will accommodate but the fender and the supports will be very tight..
I’ve had 3 Dyna’s from that era. The first one I had to try the 180. After taking the wheel on and off a couple times, I went back to a 170. The 180 is not worth the extra bloody knuckles as it is a pretty tight fit. I’ve since gone back to the 160.
 
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Old Mar 5, 2026 | 03:47 PM
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Looks like it will work. It's the sides that stick out some that had me worried.

 
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Old Mar 5, 2026 | 03:52 PM
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Shinko Radial 170/80/ZR17 Advance 005 Looks like it will fit ok. I looked for less expensive tires this year.

 
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Old Mar 5, 2026 | 03:53 PM
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I've used that tire.. It fits and hooks up well.. I really like it..
 
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