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Discussion Starter · #1 · (Edited)
Hey, I'm hoping some of you experts can help me out with this. I once knew a thing or two about motorcycle suspension geometry but it's been years so I'm basically starting from scratch here. I've revalved a shock once for a class assignment, years ago, and don't really remember much about it. I remember it was super easy though.

I got my XR650R and I need to fix up the suspension for street use. I'm aware of the CRF450 conversion and I might do that, but I think it would be cheaper to respring and revalve the stock suspension. I don't care about the looks so much. I live right near a HUGE bike junkyard, so I can get pretty much whatever I need off other bikes too.

The only thing is, I have to lower it. This is not an option, I'm 5'7". I'd like to be able to get at least toes down with my nuts on the tank, but I might be dreaming with that one.

TBH I don't know what I'd be looking for in springs or how I should expect weight to be distributed front to rear. For lowering the front is a shorter spring good enough, or do I need to shove the forks higher in the trees? I feel like pushing the forks higher would affect the handling. If anyone can even point me towards a resource that would be a big help. I can read on my own but I can't seem to find a good technical resource, just a bunch of guys saying "go to a shop." I know it's not that hard since I've done it before. I know enough I should be able to adjust the settings once I have the hardware in the ballpark. Most of the threads around here either do the CRF or (it sounds like) don't mess with suspension at all. Are you guys just cranking the damping way way up?

I'll post up whatever I do with pics and explanations for sure.
 

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Discussion Starter · #3 ·
might try here.............

http://borynack.com/XR650R/Cycle/suspension.htm

I know nothing, zero, zilch about suspension but I have this bookmarked for when I dive into mine in the near future.
Thanks, I saw that one and it's not quite what I'm after. I think a more appropriate description for a SM setup would be something like this:

http://www.gostar-racing.com/information/motorcycle_suspension_set-up.htm

Unfortunately neither of these dive into spring and shim stack selection. I'm considering purchasing this: http://www.performance-design.net/performance_design_suspension.htm

just because it's the only thing I've really seen that looks like it will work. It looks like it will also shorten the wheelbase some though, which I'm not sure I want on a bike I also use to commute.
 

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Discussion Starter · #4 ·
Found this from the same site: http://borynack.com/XR650R/xr650r_forks.htm

Not quite a street setup but it gives an idea of the basics.

Looked up pricing on the nice forks and it's insane. Definitely going to mess around with this and the lowering link first.
 
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