Topic: Box Section Swingarms

[pekingduck]

Looking for a steel or aluminum box section swingarm as an upgrade for a CB500/550 to accommodate a slightly wider than 140 tire, and needIe bearing pivot. And lighter, more rigid, and better looking in the process. I have 3 questions.

What's out there in the aftermarket, or that can be adapted, besides the GS1100,  Radian, and Zephyr?

I believe stock CB650s are an inch longer, CB750s an inch shorter, but fit without mods. Is that true?

I was talking to a manufacturer who used to make an upgraded box section steel swing arm for Yamaha XS650s and SR500s many years ago. Is there any market for one for our Hondas in the $300 range?

[Tim2005]

I believe you can still get a new one from Dresda https://www.facebook.com/dresdaclassic/

[Shtonecb500]

https://www.instagram.com/chriscarrdesign/?hl=en

This guy is local to me in Michigan, he can make custom swing arms for our bikes. I was going to have him replicate the box swingarm on my 750 but havent gotten around to it.

Stock swing arm fits a 140 fine, just weld on bracing to a stock swinger.

You wont find an aftermarket box swing arm in the 300 dollar range, you will have to hunt craiglist, fb marketplace, and ebay for a used unit, even then the cheapest they get is around 600....you can usually find a parts bike with one for parts bike/rolling chassis prices. You have to be searching everyday though.

the length ur talking about doesnt make a difference as far as having to mod the bike.

I think what you want is the "look", which is fine. But you'll have to pay up for it.

[pekingduck]

Thanks for your replies and comments.  Obviously not something many want.

[newday777]

Looking for a steel or aluminum box section swingarm as an upgrade for a CB500/550 to accommodate a slightly wider than 140 tire, and needIe bearing pivot. And lighter, more rigid, and better looking in the process. I have 3 questions.

What's out there in the aftermarket, or that can be adapted, besides the GS1100,  Radian, and Zephyr?

I believe stock CB650s are an inch longer, CB750s an inch shorter, but fit without mods. Is that true?

I was talking to a manufacturer who used to make an upgraded box section steel swing arm for Yamaha XS650s and SR500s many years ago. Is there any market for one for our Hondas in the $300 range?

$300 price range would be wonderful to see that again for a good box swingarm.  Unfortunately the cost is much higher, like 5 times now for the few places out there that offer them. Yes it may be because there are fewer wanting them because most don't want to spend out that much money.

This is an aluminum race type swingarm for the 750

https://japan.webike.net/products/21983410.html

[newday777]

This is a steel 1" extended box swingarm with CB750K7/K8 type axle adjuster for only $500 ready for paint which is a bit more price friendly.

https://mgsperformance.com/product/custom-swing-arm-1975-1978-honda-cb750-mgs-performance/

[newday777]

So if you have someone who will build a good box swingarm for the $300 price point let us know..... I'd be interested.

[Shtonecb500]

keep an eye on cycle x, they turn over a good amount of parts and is mostly drag and race bike stuff, they sell stuff fast though. Also keep an eye on their facebook page and official website....should all be linked somewhere on the ebay store..
https://www.ebay.com/str/cycleexchange

it took me bout 2 years to get my hands on a nice one, i usually see the super extended 3 position axle swingers the most, I think they are ugly tho and anything longer than 2 inches throws off geometry.

the other cb swing arms should fit without modification, maybe the passenger mounts get in the way if anything?
people for sure want box swing arms but almost every is made to order and expensive.

[70CB750]

How about this one?


https://www.ebay.com/itm/1982-GSX1100S-KATANA-Genuine-Aluminum-Swing-Arm-Set-CB750F-For-Diversion-yyy/265856793269?hash=item3de64cbab5:g:hdQAAOSw36xiZ~rx&amdata=enc:AQAHAAAAsEv9cqxFIvCMadFxf4+uu7jKC/5FCcLW/5Eqgk2LlCUDO3C9jar9PH8++XGeGzYqHdspO3G2mEIYTRfCkyYIntrEACtgWggf+JCV8gaoParjwx1g/vJK7ZNfJV2SsQ78MOgSx5T5wheTeBMPIROD8VaOCKaQIQyV27Xr9noKP80fcpPD2yxM4U2WXnvSGeRgiwDasyegRIsjYk/qBQL+zLN6MuUuXVlCYc61BjxJubyS%7Ctkp:Bk9SR5DY4a2-YQ&pageci=c826c2d7-1dee-4f70-9300-836186ecd0f3&redirect=mobile

[Shtonecb500]

How about this one?


https://www.ebay.com/itm/1982-GSX1100S-KATANA-Genuine-Aluminum-Swing-Arm-Set-CB750F-For-Diversion-yyy/265856793269?hash=item3de64cbab5:g:hdQAAOSw36xiZ~rx&amdata=enc:AQAHAAAAsEv9cqxFIvCMadFxf4+uu7jKC/5FCcLW/5Eqgk2LlCUDO3C9jar9PH8++XGeGzYqHdspO3G2mEIYTRfCkyYIntrEACtgWggf+JCV8gaoParjwx1g/vJK7ZNfJV2SsQ78MOgSx5T5wheTeBMPIROD8VaOCKaQIQyV27Xr9noKP80fcpPD2yxM4U2WXnvSGeRgiwDasyegRIsjYk/qBQL+zLN6MuUuXVlCYc61BjxJubyS%7Ctkp:Bk9SR5DY4a2-YQ&pageci=c826c2d7-1dee-4f70-9300-836186ecd0f3&redirect=mobile

do they mean to say cb750f conversion? interesting. just be careful and measure it....I know some people have  had swapped 750 and 900 DOHC swingers onto their bikes but that had to shave off some millimeters from either side....depending on how they wanted the line up the rear wheel.

[70CB750]

How about this one?


https://www.ebay.com/itm/1982-GSX1100S-KATANA-Genuine-Aluminum-Swing-Arm-Set-CB750F-For-Diversion-yyy/265856793269?hash=item3de64cbab5:g:hdQAAOSw36xiZ~rx&amdata=enc:AQAHAAAAsEv9cqxFIvCMadFxf4+uu7jKC/5FCcLW/5Eqgk2LlCUDO3C9jar9PH8++XGeGzYqHdspO3G2mEIYTRfCkyYIntrEACtgWggf+JCV8gaoParjwx1g/vJK7ZNfJV2SsQ78MOgSx5T5wheTeBMPIROD8VaOCKaQIQyV27Xr9noKP80fcpPD2yxM4U2WXnvSGeRgiwDasyegRIsjYk/qBQL+zLN6MuUuXVlCYc61BjxJubyS%7Ctkp:Bk9SR5DY4a2-YQ&pageci=c826c2d7-1dee-4f70-9300-836186ecd0f3&redirect=mobile

do they mean to say cb750f conversion? interesting. just be careful and measure it....I know some people have  had swapped 750 and 900 DOHC swingers onto their bikes but that had to shave off some millimeters from either side....depending on how they wanted the line up the rear wheel.

I am not sure what they mean.  Will measure and post here.

[pekingduck]

Thanks everyone, lots of great info here.

I stumbled on this thread on the forum.  2 pictures tell 2000 words.

http://forums.sohc4.net/index.php/topic,139745.msg1583298.html#msg1583298

CB650 is apparently in between 550/750 width at the pivot.

[bryanj]

500/550 and 750 use the same pivot collar so must be the same width

[pekingduck]

Good to know.  I checked 1979 CB650, and it's also the same p/n, but 1980-1982 CB650 models use a different center pivot collar and swingarms, still not needle bearings. No idea why. 1979 and later CB750s also use a different collar, but afterwards went to needle bearings.

[70CB750]

How about this one?


https://www.ebay.com/itm/1982-GSX1100S-KATANA-Genuine-Aluminum-Swing-Arm-Set-CB750F-For-Diversion-yyy/265856793269?hash=item3de64cbab5:g:hdQAAOSw36xiZ~rx&amdata=enc:AQAHAAAAsEv9cqxFIvCMadFxf4+uu7jKC/5FCcLW/5Eqgk2LlCUDO3C9jar9PH8++XGeGzYqHdspO3G2mEIYTRfCkyYIntrEACtgWggf+JCV8gaoParjwx1g/vJK7ZNfJV2SsQ78MOgSx5T5wheTeBMPIROD8VaOCKaQIQyV27Xr9noKP80fcpPD2yxM4U2WXnvSGeRgiwDasyegRIsjYk/qBQL+zLN6MuUuXVlCYc61BjxJubyS%7Ctkp:Bk9SR5DY4a2-YQ&pageci=c826c2d7-1dee-4f70-9300-836186ecd0f3&redirect=mobile

do they mean to say cb750f conversion? interesting. just be careful and measure it....I know some people have  had swapped 750 and 900 DOHC swingers onto their bikes but that had to shave off some millimeters from either side....depending on how they wanted the line up the rear wheel.

Looks like the one I have in my shop.