Measuring shock length
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Cruiser
Joined: Mar 2014
Posts: 216
Likes: 2
From: Upstate NY
Measuring shock length
When measuring rear shock length, do you measure from the center of the mount holes or from the absolute top and bottom of the entire shock?
Mine are 11.5 from center eye to center eye, so I'd like to go a big longer but wanted to be sure.
Thanks!
Mine are 11.5 from center eye to center eye, so I'd like to go a big longer but wanted to be sure.
Thanks!
Stellar HDF Member
Joined: Aug 2009
Posts: 3,212
Likes: 212
OEM shocks are center-to-center at full extended length. This is essentially the same as when they are sitting unbolted save a few tenths of a millimeter.
When ordering new shocks, go with 12.5" or above. Most companies use this as the point where the spring rate changes from the short travel to long travel (and accompanying damping force changes), which leads to a much better ride.
Short dampers are only for looks. The best range for Sportsters is 12.5" to 14.5" dampers. Above or below that is a design compromise when you consider our frame and swingarm setups.
My personal choice would be 13"-14".
When ordering new shocks, go with 12.5" or above. Most companies use this as the point where the spring rate changes from the short travel to long travel (and accompanying damping force changes), which leads to a much better ride.
Short dampers are only for looks. The best range for Sportsters is 12.5" to 14.5" dampers. Above or below that is a design compromise when you consider our frame and swingarm setups.
My personal choice would be 13"-14".
Road Warrior
Joined: Oct 2007
Posts: 1,599
Likes: 11
From: Colonial Beach, Virginia
Since the shocks are at approximately a 45 degree angle to the swing arm the bike will only be raised about half of the additional length, give or take a little. More or less. This is how my 1200 C sits with 13.5" Progressives 440s on the rear.
Last edited by 1200Cdriver; Oct 16, 2014 at 08:55 PM.
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