are you going to strech the stock swingarm or are you going to build a new 4" over swingarm. The cb750 stock pressed halves swingarm is ok in stock length but crappy to extend (and you run the risk of splitting the welds with the extra leverage). To do this job proper why not make a new swingarm out of box tubing - at the very least it will be stronger than the crappy swingarm. If you get the correct box tube dimensions you can even rob the axle adjusters off a cbr 600 f2/f3 (uses the same axle diameter as a cb750). If you have ability to strech the stocker then you have the ability to make a new one.
It will be easier to add OE parts (and lighter) if you use aluminum for the swingarm. Although it will be more expensive and involve more physics to get the right amount of material where it is needed to avoid breakage. Another thought.... Maybe a longer MX swingarm modified? Just a thought.
Also avoid using square or rectangle steel tubing. Tends to be drastically stiffer and puts a lot more stress on the spokes.
and why 4"? did you measure or just guessing.
Who cares?
Looks like you are using cb900F shocks. Really? as if you weren't killing the bike enough you are going to run 20+ year old shocks on it? Look around you can find cheap new ones or at least newer used ones.
Honestly.... are you always an a$$hole or just to IC? Regardless of quality ever think about whether or not he likes the way they look? Show me a picture of your bike so I can pick it apart. Oh wait.... I'm not a thoughtless a$$.
you may want to think twice about drilling as many holes as you did in your new brake arms and actuator arms. there is actually a science to drilling "speed holes" that has a lot to do with the size of the hole, the pattern, the size of the part, its mateiral, and the way it will be stressed. The actuator arm I don't really see being a problem but that brake stay may strech over time which is not something you want.
While this is a valid and logical statement it is lost by your overall sense of attitude. You come off (at least in writing) as a jerk, putting things down and asking questions as if your ideas and opinions are the only ones that should be regarded.
I still think it is a dumb idea.
IIRC it has been stated already what you think and I still only see one other person who actually cares what you say. Eldar. So please.... Either contribute with facts, positive idaes, or easier ways to get things done, or I will be forced to treat every one of your posts this way. You are starting to irritate me.
racing levers are notched so that they break away if they are dropped, the ones on my ducati look really thin where the break point is. levers are not under a lot of stress so drill the crap out of them - who cares. Even the brake actuator arm is not under load the way that strut is. It is not common but I have seen them break on stock bikes (there was someone who posted to this forum with one that snapped on his 550 not too long ago - usually they snap after the crash), remember they have the entire weight of a spinning wheel on a them.
Just to let you know how dangerous they can be.... the levers on an early 90's 900SS are thin to break but they WILL almost always break up by the pivot point. Something the designers were told of but ignored. I've broken enough on my own 900 to seriously think about finding different MC's to replace them with. Broken a few just grabbing them to stop. Scared the crap out of me. Then I made some out of steel. Apparently I squeeze hard!!!
For once I agree with you 100%.
cars and bikes respond differently to changes in rim and tire size. All that a bike is - depends on their tires and rims.
Another 100% agreement from me. I'd also like to add weight distribution both front and back and side to side.
Industrial -
Your final tire size will determine what size wheels you will need.
Final wheel size will determine swingarm dimensions.
Swingarm dimensions will determine where your sprockets will need to be placed and what size they need to be.
After that everything else is linear measurement. (i.e. brake arm, etc.)
Also.... might be easier to run a rear disc. Just thinking.
