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Think this is my biggest change of getting a solution on my problem. :p

First of all, I have a CB350 twin from 1969.
I about to swap the fork on the 350 to a fork from a CB500 to get the front disc brake setup. On this 18" rim I know I can fit a 4.00 Firestone Vintage tire (have that setup on my CB500K3-77)

What I am now thinking about and cant figure out..... :confused:

I would like to have 16"x 3 rim in the rear with a 5.00 (at minimum a 4.50) Firestone tire. This is as I know a hard task due to the space in the stock swingarm. I know I might have to swap stock swingarm to another one.

  1. ??? But, which swingarms are a "clean swap" without any big modifications at the frame?
  2. ??? And if I switch stock swingarm to say one from a SL350 do I need to use the hub from SL350 to make it fit?
  3. ??? Or can I just extend the stock swingarm and then it will all fit with a 5.00 tire?
  4. ??? How how shall I finalize this? :confused:


As I said, I would like to be able to have that fat tire in rear with as little modifications on the frame as possible.

(I know the bike will handle worse. This is just for the look. I am a novice mechanic)

Had one older thread that handled some of this questions but didnt get the answers I needed, maybe due to poor english or misunderstandings. :(

http://www.hondatwins.net/forums/52...imum-vintage-tire-size-cb350-twin-1970-a.html
 

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Cm 250 should be pretty close.
But....as soon as you swap the arm youll need to rethink the rear hub and that will require making sure the front and rear sprockets are aligned and the shock posts are at the same with not at some wierd angles.
Since this is just about what you think looks good and youre not concerned about rideability...... Just make it easy on yourself, (or youll just end up with some unsafe pile of junk)
Cut and plug the stock swing arm, also have a piece of flat welded on edge to stiffed up the length
Then buy a new undrilled rim of a width that will fit your tire correctly and have it drilled and laced to fit your stock hub. Be wary of the chain rub
While it doesnt have the Johnny Cash "one piece at a time" asthetic youre after its the easiest way to make it work.( speaking from experience!!!)

https://cognitomoto.com/products/cb350-weld-on-swing-arm-extenders
 
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