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Old 11-10-2008, 09:39 PM   #1
Guy Jinbaiquerre OP
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Joined: Oct 2008
Location: Tokyo, Japan
Oddometer: 1,222
GS/GSA seat height "calculator"

After looking at official BMW materials and also doing research online, I think I have come up with a way to calculate what various options and settings will do to the seat height of your 2008 or later GS or GSA bike. (The specs may be the same for earlier years, but I haven't checked for sure) This could be helpful for people wondering how to get the bike down (or up) to a particular seat height.

Using the "calculator":

The starting point is the stock 2008 GS with stock GS suspension and the stock adjustable GS seat in the low position. This has a seat height of 33.7 inches (855mm). Then, based on the suspension (I'm assuming GS and GSA shocks are interchangeable) and the seat you choose, simply add or subtract as indicated:

1. GSA suspension: Add 0.8inches (20mm)
2. GS extra-low suspension: Subtract 1.2 inches (30mm)
3. Adjustable seat (GS or GSA) in high position: Add 0.8inches (20mm)
4. GSA seat: Add 0.8inches (20mm)
5. BMW low seat: Subtract 1.4 inches (35mm)
6. Touratech X-low seat: Subtract 2.2 inches (55mm)

Some examples (in decreasing height order):

GSA suspension, stock GSA seat in high position: 855 + 20 + 20 + 20 = 915mm (36.0 inches)
GSA suspension, stock GSA seat in low position: 855 + 20 + 20 = 895mm (35.2 inches)
GS suspension, GSA seat in high position: 855 + 20 + 20 = 895mm (35.2 inches)
GSA suspension, Touratech X-lo seat: 855 + 20 - 55 = 820mm (32.3 inches)
GS suspension, BMW low seat: 855 - 35 = 820mm (32.3 inches)
GS suspension, Touratech X-lo seat: 855 - 55 = 800mm (31.5 inches)
GS extra-low suspension, BMW low seat: 855 - 30 - 35 = 790mm (31.1 inches)

I welcome corrections if you know I got something wrong. For example, one thing I am assuming is that because the GSA only has 20mm more suspension travel front and rear than the GS, the suspension is responsible for only half of the 40mm seat height increase over the GS; the other 20mm must come from a thicker seat on the GSA, I think.
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