How to figure out what length springer needed?

I have hydraulic forks now and am looking into putting a springer on. I'm trying to find out the length I need, either under or over stock length to get my desired ride height. My bike right now is lowered 1" but I have been considering going to 2".

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Sep 24, 2012
Determining Springer Possitioning
by: Anonymous

Boys, The end result TRAIL is the real determining factor; you want to end up in the range of 2 - 3.5 in. Factor in the Neck Tube rake, Triple Tree rake, and total fork length (bottom of neck tube to axle center, and half the total front wheel/tire height; Do a little math, and determine exact Trail. With this info, adjust axle center on rocker forward or back to achieve ideal Trail; This may involve changing mounted rocker angle slightly. If you have trouble figuring this out, get any high school geometry teacher and a seasoned bike mechanic involved. That should get it done.
One warning: Be sure that neck tube angle (Rake) is measured with the frame level (Normal), so ... usually with rear tire mounted and frame upright and level. This should help you do this correctly. Good luck!
WildBillCody, NC.

Feb 27, 2012
Interested in the answers
by: Albert Nagel

I'm interested in the answers. As i am working on rebuilding my bike and I'm dubbing on replacing the ooriginall fork with either a girder or a springer. To have some information on dimentions would be great.

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