I asked e-mailed Aftershocks a few weeks ago about lowering via shock internals instead of the method under discussion here (shortened ride height adjuster). Here is there response I received yesterday:
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To answer your direct question, yes, the Showa shock can be shortened. We shorten them internally by adding spacers. However, if we are shortening your shock, we need to shorten the forks as well, internally, to keep the same riding geometry. You didn’t mention what you are doing with your forks, but if you are running your forks up in your triple clamps, you are going to run into issues with the front tire running up into the triples or the radiator.
The most we can shorten your bike is 2 inches. We would HIGHLY recommend revalving the forks and shock as well if we are lowering an inch or more. (You would benefit from revalving no matter how much we lower it, but especially lowering 1+ inches.) Lowering the shock will put it in the rising rate part of the link, so it is starting at a stiffer point mechanically. By revalving, we can soften the valving and make the ride smoother and more plush.
As for costs, all of the labor to revalve and lower the suspension is $540. If you bring in the whole bike and we need to do the teardown, it is an additional $175.
For parts, we will need 2 bottles of oil, which are $10.50 each. If you would like us to change your fork seals as well, they cost around $25 for the set.
If we lower the suspension only and you do not want to do the revalve, the lowering is $340. Teardown and parts and the same as above.
Thank you.
--Marra
AfterShocks - The Suspension Experts
(650) 494-8849
http://www.aftershocks-suspension.com
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I think this might be thea better alternative to fiddling with the ride height adjuster. I just need to see if a 2" drop is enough with the stock geometry.