Frame up builders

[limeex2]

I've scratch built quite a few frames - and braced a lot of stock ones for racing. Finding someone to modify a frame for street use is becoming a can of worms in a lot of places around the world. Here any deviation from stock requires an engineers certification before it can be registered for the street. I believe it to be even tighter in Europe.
If you do ask race frame builders, I suggest you supply a copy of any relevant local laws/rules the work will have to comply with.
I'm sure someone will come up with a link to the Yosh frame bracing for you. Just remember that it's very easy to waste a nice stiff frame with compliant suspension by fitting flexible wheels....The best handling tip back in the day was replacing wire wheels with cast.

I am not opposed to NOT bracing it also. The goal is a well balanced street bike that looks similar to a 84? GS700 Yosh/Schwantz race bike but handles, brakes and drives like a modern Sport-Touring, which to me means comfortable all day riding 250 mile days on sheety Mn. roads. I have 3 different types of rear shocks I can use. 2 pairs of 14.5" ZRX piggyback shocks, 1 reworked OEM other, a set of Ohlins from previous projects. I also have a set of 13" Bi-Tubo's speced for a GS. The ZRX shocks will require ZRX upper shock mounts to replace the existing GS mounts. I have these. Either set of shocks will require mount points on the Bandit swinger. I would like to use the ZRX shocks because, well, there Ohlins and I have them. On the other hand, if using a 1.5" longer shock is going to open up a can of worms that is difficult to deal with, I will resort to using 13" shocks.

I will also be using a non-stock GS11 4V motor. With the increase in HP, modern front and rear ends, wheels, now is the time for chassis upgrades IF needed. It will not be raced and title stuff is not an issue. I've been involved with GS's since 1977, have lots, but limited GS knowledge and lots of parts I have been saving over the years. When I found this website I was recovering from a deer collision and it basically saved me from selling my old GS stuff and re-ignited my love for them. Many others here have probably gone down this road and armed with the right knowledge, the bike bike will be a well sorted rider instead of a collection of nice parts that to me is basically a cute cafe turd. I'm retired and want use up all my goodies on 1 last resto-mod. and still be young? enough to drive it! Oh wait, I forgot about 1000S stuff... Thanks for your time and suggestions.

[Rob S.]

This is a genuine South African E27 SXZ with the chrome moly swing arm.

Saffer SXZ moly swing arm by Max Mutarn, on Flickr


Saffer moly 2 by Max Mutarn, on Flickr

That tube is stiffer than the built up box section aluminum 11E swingarm?!?

[limeex2]

So what's the reason?

Reason for what? I'm Basically looking for help to find a frame person. I need to set rear shock angle, placement and length. Probably need a set of clamps.

In regards to the questions, is round stronger than square, I believe it tis he type/strength of the metal that is being mentioned.

[Nessism]

https://www.thegsresources.com/_forum/forum/technical-forums/performance-tuning-mods/89014-frame-bracing-boxing-vs-tubing

https://oldskoolsuzuki.info/archives/315

[limeex2]

https://www.thegsresources.com/_foru...xing-vs-tubing

https://oldskoolsuzuki.info/archives/315

Great links, Thanks

[Shin-Ken 1074]

That tube is stiffer than the built up box section aluminum 11E swingarm?!?

Chrome moly is the abbreviation for "chromium molybdenum", and it is an alloy steel. It was designed for and is used extensively in the aircraft industry due to it's high tensile strength and torsional load ratings.

Because of it's higher strength (almost double that of mild steel), it is possible to use thinner gauge tubing when building a product which provides for less weight, or a product that is the same weight but nearly twice as strong.

The Saffer chrome-moly swing arm improved handling without adding weight to the bike or requiring frame bracing. The advantage in using chrome-moly is the "twice as strong" property of the material.