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Aluminum swingarm quest

Started by 85RZwade, September 01, 2020, 09:18:07 AM

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oxford

Quote from: sav0r on September 09, 2020, 03:07:57 PM
Can anybody provide me the dimensions of the rectangular tube stock on the DG or similar swing arm?

I'm not sure what you are wanting to do with the info but be aware that some of the swingarms are using extrusions not simple box tubing.  I am pretty positive that the DG arms did use tubing though.

sav0r

I was just curious. The answer was mostly provided in the online metals link.
www.chrislivengood.net - for my projects and musings.

RDFL


SoCal250

Quote from: sav0r on September 09, 2020, 03:07:57 PM
Can anybody provide me the dimensions of the rectangular tube stock on the DG or similar swing arm?

Chris, I just measured a MotoCarrera arm that I have here. It's 1"x2" tube, and the pivot tube is 1.5" OD
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

sav0r

Quote from: SoCal250 on September 09, 2020, 07:19:34 PM
Quote from: sav0r on September 09, 2020, 03:07:57 PM
Can anybody provide me the dimensions of the rectangular tube stock on the DG or similar swing arm?

Chris, I just measured a MotoCarrera arm that I have here. It's 1"x2" tube, and the pivot tube is 1.5" OD

Thank you!
www.chrislivengood.net - for my projects and musings.

m in sc

grade of aluminum is everything, and overall shape. hence the shape of the motolana arm makes it very strong. 6061 t6 box will do just fine as well. i mean, they were made in the 70s, and affordably sold, i would venture to say thats equivalent to what was used. .02

pdxjim

6061 is the current cheap bicycle frame material dujour, and has been for the past 20 years.

Too bad the demand isnt greater, because those same fantastic Chinese robot welders could be knocking out RD swingarms dirt cheap.

There are six chapters to this vid. It's worth watching them all.




Wasting time on 2T forums since the dawn of the internet. '89 TDR250, '13 300xcw, '19 690smcr, '56 Porsche 356A

rodneya

Not mine, but the Motolana doesn't look clunky at all

85RZwade

I post waayyy too much

pdxjim

#69
Quote from: 85RZwade on September 12, 2020, 01:33:57 AM
I suspect the Giga

https://japan.webike.net/products/23209961.html

And the Motolanna super tuff w/welded shock mounts

https://www.motolanna.com/ourshop/prod_448876-Swingarm-Aluminum-Alloy-SuperTuff.html

Are the same item. Is it just me?

They are def close, but the dropouts aren't the same.
Wasting time on 2T forums since the dawn of the internet. '89 TDR250, '13 300xcw, '19 690smcr, '56 Porsche 356A

Cdffiredad

https://www.facebook.com/549685025368762/posts/1398045710532685/
Here's another I saw in a Facebook group the other day for LC models. Maybe he would do AC swingers as well?

pdxjim

That LC swinger looks pretty ruff.

$399 plus shipping from China.
Wasting time on 2T forums since the dawn of the internet. '89 TDR250, '13 300xcw, '19 690smcr, '56 Porsche 356A

m in sc

lc arm will bolt into an aircooled frame. but yeah, not my cup of tea there at all.

85RZwade

Yeah, I know it's been awhile. Sometimes I need time to make hasty decisions... I ordered a Motolanna swingarm tonight, for my AC RD350 frame. Gas tank arrived from Striker1423 yesterday, and the top end is in the capable hands of Mr. Ritter. Need to figure out wheels and front suspension next, but no more purchases tonight!
I post waayyy too much

stresa

A friend of mine has just finished his Motolanna swingarm built into his 1A2 RD250 race bike.
It was an easy conversion, only needed some shims and distances.


Regards Uwe
81 Jackson Special 250, 2x 74 Yamaha RD250 racer + 1 street racer, 78 Yamaha RD400, 72 R5/RD350, 74 RD250 dirttracker street, 75 Yapol TZ250, 89 Honda RS125,
80 Hejira TM250, RD375/3, 77 Höpfner-TD3, 76 RD/TD3,
74 Yamaha TZ/RD250A, 78 Siroko TZ250, 75 Bakker TZ350B, Tomic 200, Waddon Rotax125