One more 180 tire conversion FZR1000 swinger
Moderator: rztom
One more 180 tire conversion FZR1000 swinger
Wanted to do this the simplest way possible in the least visually obvious way. After doing the math to
see how much room I needed, I decided to widen the frame by approx. 18mm, which should give me
the required room for 180 tire using an 18.6mm offset sprocket sourced from fastfromthepast.com.
Then I cut the frame and used the existing swing arm pivot with spacers totaling about 19.5mm in
spacers (expected some flex back) and welded in some clam shell pieces I made up to fit the four
spaces where the frame was cut. Based on the recommendation of my welder, who repairs light aircraft
frames, I made the ends of the clam shell pieces diamond shaped, to lessen the chance of the frame
cracking along the welds. Grind off some of the original paint and off to the welder it went.
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- RZ350 Frame cut a 1.jpg (245.65 KiB) Viewed 3883 times
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- RZ350 Frame cut 1.jpg (241.3 KiB) Viewed 3883 times
Re: One more 180 tire conversion FZR1000 swinger
Clean up welds with solvent/brake cleaner and hit it with some epoxy paint.
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- RZ350 Frame welded b 1.jpg (226.17 KiB) Viewed 3882 times
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- RZ350 Frame welded 1.jpg (246.04 KiB) Viewed 3882 times
Re: One more 180 tire conversion FZR1000 swinger
Frame did flex back somewhat, but not enough to make install of swing arm impossible.
Swing arm was shortened at the pivot point by approximately 10mm/side and new IKO
bearings installed (25mmx33mmx20mm). Original bearings were 30mm wide, so the
20mm wide bearings were perfect for the 10mm reduction in width.
Will post pictures of R6 wheel and machined sprocket carrier later to show what else
was needed to align everything.
Swing arm was shortened at the pivot point by approximately 10mm/side and new IKO
bearings installed (25mmx33mmx20mm). Original bearings were 30mm wide, so the
20mm wide bearings were perfect for the 10mm reduction in width.
Will post pictures of R6 wheel and machined sprocket carrier later to show what else
was needed to align everything.
Re: One more 180 tire conversion FZR1000 swinger
Interesting, I found that for the chain to clear the tire by 2mm on one side and the frame by about 3mm on the other side, I ended up having to widen the frame by 19.5mm between the swing arm pivot points. At that point everything was string lined and the wheel was centered in the frame and aligned with the front wheel. Then the front sprocket, which was an 18.6mm offset needed to be spaced out a further 1.5mm and the rear sprocket carrier and spacers machined to push the rear sprocket more towards the center.
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- 20140905_155132.jpg (229.43 KiB) Viewed 3761 times
Re: One more 180 tire conversion FZR1000 swinger
After that the swing arm needed a 3/8" thick pad welded on for the rear brake arm to rest on and drilled and tapped for a securing bolt.
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- 20140905_155153.jpg (242.34 KiB) Viewed 3761 times
Re: One more 180 tire conversion FZR1000 swinger
Then a little bit of trimming on the front sprocket cover to clear the offset sprocket.
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- 20140905_160030.jpg (247.31 KiB) Viewed 3761 times
Re: One more 180 tire conversion FZR1000 swinger
And the finished product (just needs some minor touches and a good cleaning). And the front wheel needs to be powder coated black.
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- 20140905_162229.jpg (249.48 KiB) Viewed 3760 times
Re: One more 180 tire conversion FZR1000 swinger
Incidentally, I retained the original linkage from the frame to the shock and used a couple of pieces of 1"x3/8" aluminum plate from the shock to the swing arm linkage, 104mm center to center 12mm on one side and 14mm on the other side (those dimensions worked for my long Fox shock to raise seat height to 32"). Round the ends with a 4" disc sander and it is done. Interestingly, with the FZ600 swing arm and linkage, the suspension was very soft, but with the FZR1000 swing arm I had to back off the preload to get the right amount of sag and it feels a lot stiffer.
Re: One more 180 tire conversion FZR1000 swinger
Swing arm linkage, could be made prettier, but it works.
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- 20140905_211930.jpg (244.81 KiB) Viewed 3688 times